Tue Jul 05, 2022 3:19 pm

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Tue Jul 05, 2022 3:19 pm linkquote
Started with a new scoot on november 2021. Was kinda sad looking and neglected for roughly three decades.



Did a little wire-wheeling to see what kind of tinworm lives under the surface. The metal was in surprisingly good condition and a spark of hope was lit on NOT having to build the scooter completely again from ground up.


There was a lot of play in the front swingarm assembly and every single place was rusted into a lump of finest Italian metal. Even the brake pads had to be cut into pieces with angle grinder to get them off. Well, there goes that little hope on getting off easy that was kindling just a moment ago.


One weird thing about the scoot is that it had SHB 16.16 while to my knowledge Primmys should all have SHB 19.19.


Then for the lump someone might call an engine. Well, it's crusty and utterly stuck. Judging by the engine number the lump is original and has not been swapped.


Off go the parts to get into all nooks and crannies


Frame stripped clean and ready for some well deserved attention.




Continued off with stripping all the other assemblies and getting them ready for bead blasting. As the image suggests, the throttle and gear tubes were stuck like hell. Used a torch, WD40 and some love with a mallet.


Parts ready for blasting.


Steering lock has been broken quite ugly in 1989.


Making things flat with a cut off disc


Scavenged some parts from a scrapped frame of a moped


And in they go with help of a welder and die grinder


Blasted the small parts in a cabinet with glass-beads while frame went off to be sand blasted in a bigger chamber


After the frame was blasted, I checked there were no further needs for welding hiding under the layers of paint and grime


Couple days later got a picture from the powder coating shop


Nice bright colors coming through!


Got the parts home and the assembly well underway


Lower steering bearing proved to be a bit of a challenge but gave up after making a long punch tool from M20 rod and a washer.


Steering lock barrel turned out nice


Pulling the cables and wiring harness went smoothly with help of an USB Endoscope


No wonder the front swing had some major play in it. Off to the press to get the old worn out axle off


and in with the new one


Ready to be assembled. Not much could be done for the front shocker stud since it appeared to be non-replaceable.


Adding the floor rails


Steering column mostly assembled


New bearings in place and starting to look like a scoot again


Headset assembled and fitted back to it's place


I previously had a slight incident with the white -74 Primavera side hatch. The re-peened latch gave up and hatch decided to go flying in speed of 60km/h. This time I wanted to avoid the same fate and drilled a deep hole with 2,5mm drill. Threaded it with M3 tap and added a nice long screw with threadlock and washer to hold things together.


The locking lug of replacement lock cylinder was a tad too wide to fit inside the slot in steering column. Slight re-shaping with a cut off disc and in with the cover.


Grips in and all the cables routed to their pass-through rubbers


Replacement harness had the flat type connectors for the headlight so chopped them off and replaced with round type connectors.


Looking good and ready for the front wheel and engine


For my own safety I decided to move the scoot into the bathroom for the fitting the motor. Stock motor is still on the healing-bench since I had the pre-Parmakit Polini-engine from the white -74 laying around. The engine has 133 Polini, welded-on Polini reed assembly, Pinasco crank and BGM Superstrong clutch. Topped off with PHBL24, Polini banana-exhaust and HP4 flywheel-stator assembly




Nice to see the scoot standing on it's own paws again


There was a slight hitch with the clutch cable. Engine has a long clutch arm but the cable retainer is the short type that causes the cable to foul with the kickstart lever.


Bit of fiddling around, grinding and welding a solution was conceived.


No more contact with the lever but might had to add some stiffening later to get rid of the holder flexing when pulling the clutch.


The speedo was also not so surprisingly stuck so time for disassembly, cleaning and some fresh oil.


The finished speedo turned out beautiful


Last stretch in the assembly



The original saddle was a sad story. Front hinge was rusted to one piece and snapped off when I tried to lift the seat up. Springs were missing and the whole thing was badly rusted. A silver lining were that the saddle still had the original seat cover AND the stiffening-rubbers under the ugly pull-over seat cover. The rubbers were the only salvageable parts from the seat but I was in luck that I just had a seat that was missing them waiting from the times of white -74 build ten years ago.


This was the first time I installed a new seat cover for a Vespa seat but it turned out quite nice in my opinion.


And in the whole seat goes


After working on the saddle I made a holder for the Ducati-type CDI. Piece of steel, small bend on the vice and holes to fit the CDI mounts.


The red flywheel was fugly to be blunt and did not fit to the color scheme at all


Spinning the flywheel with aid of a M8 bolt, couple washers and a nut. Off comes the paint with wire-brush and then a lick of black paint to make the thing more subtle.


Much better now


Wires routed to the CDI and juction box wires connected. Did the required modifications for the closer-type brake light switch circuit of the harness and some tidying up.


In goes the carb. Might still switch to Malossi 160' bend on the top of the carb.


Light switch took some modifying to get the horn switch converted to a closer-type. It was a bit of a surprise that there are brass brushes on both sides under the horn switch washer that really make the contact for the horn and break when button is pressed which separates the contacts. Chopped one brush off and the conversion is complete.


Some wiring mods under the light switch because of the conversion to regulated AC system. Grounded the green wire from the horn with black wire and moved the white wire from horn from terminal 4 to 8. Also moved the pink wire from the stator light coil from terminal 3 -> 4.


Mounting the regulator and spliced the cable for connection.


Scooter out, fuel into the tank and running with second kick.


The regulator was not working due to wrong connections or just being broken. Decided not to chase it and threw in a single wire regulator poached from a sled. Added an adapter on the carb and fitted a shortened universal-type pipercross filter on top of it.


Click the picture for a video with the engine running and revving


Some more finishing work. Added a connector for the speedometer light wire and fitted the speedometer cable properly on the lower end. It was poking out a bit and the cable core did not reach all the way down inside the small gear.


Shortened the SIP FastFlow 2.0 tap's lever for 10mm and drilled a new hole to make the lever flush with the frame.


4mm aluminum plate for the registration and bolted on as a package to the frame


Ready scooter and just some tuning to the carb needing to be done.








Out for a spin (video):


Took the scoot out for a ride today. Pulls pretty well with the standard gearing and can make the speedo needle disappear completely on the motorway. Clutch works like a dream and engine pulls really well from all the way down on the rev range.


To take the tank off, you have to undo two bolts at the front and the fricking seat locking stud. Why on earth did they not fit the frame with a fixed nut inside the frame to catch the stud... And why did I forget to weld one in prior to the frame being sandblasted and painted...


To work around this issue, I made an unholy alliance between M7 and M5 nuts with a welder and finished it off with a lick of paint. Fixed the thing on the frame, drilled a hole and countersunk the it to make room for the screw that will be holding the thingy in place.


No more cramming my hand elbow deep inside the fender just to get the stud off.


Last edited by FINYoshi on Tue Jul 05, 2022 11:59 pm; edited 2 times in total
Tue Jul 05, 2022 3:48 pm

Veni, Vidi, Posti
Joined: 22 Oct 2011
Posts: 5149
Location: Tega Cay, SC
 
Veni, Vidi, Posti
Joined: 22 Oct 2011
Posts: 5149
Location: Tega Cay, SC
Tue Jul 05, 2022 3:48 pm linkquote
Lighting strikes twice! Another great story with pics. Thanks for sharing.
Tue Jul 05, 2022 4:01 pm

Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1712
Location: Toronto
 
Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: 29 Jun 2016
Posts: 1712
Location: Toronto
Tue Jul 05, 2022 4:01 pm linkquote
That was great fun to read through! Must have taken forever to write it up - thanks for taking the time
Tue Jul 05, 2022 7:57 pm

bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: 26 Sep 2013
Posts: 6524
Location: So Cal
 
bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
Joined: 26 Sep 2013
Posts: 6524
Location: So Cal
Tue Jul 05, 2022 7:57 pm linkquote
Beautiful work, attention to detail is top notch.
Wed Jul 06, 2022 3:11 am

Member
Faro basso 53, Motovespa 58, V50 71
Joined: 02 Feb 2022
Posts: 43
Location: Netherlands
 
Member
Faro basso 53, Motovespa 58, V50 71
Joined: 02 Feb 2022
Posts: 43
Location: Netherlands
Wed Jul 06, 2022 3:11 am linkquote
great work, lovely primavera!
Wed Jul 06, 2022 4:18 am

Addicted
Joined: 28 May 2020
Posts: 568
Location: Planet Earth
 
Addicted
Joined: 28 May 2020
Posts: 568
Location: Planet Earth
Wed Jul 06, 2022 4:18 am linkquote
WOW, inspirational. Congratulations. Its gorgeous.
Wed Jul 06, 2022 4:21 am

Molto Verboso
GL, PK, PE200 with hack, Sears Rust Badge
Joined: 24 Apr 2012
Posts: 1337
Location: Deep in the heart of Texas
 
Molto Verboso
GL, PK, PE200 with hack, Sears Rust Badge
Joined: 24 Apr 2012
Posts: 1337
Location: Deep in the heart of Texas
Wed Jul 06, 2022 4:21 am linkquote
I'm sure you're glad to find this forum just to show off projects.

Last edited by rowdyc on Wed Jul 06, 2022 9:13 am; edited 1 time in total
Wed Jul 06, 2022 8:47 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Wed Jul 06, 2022 8:47 am linkquote
It's nice to have a kind of writeup. This way others can learn too and get their own ideas.

It's also nice to be able to go back to one of these posts to see how something was done. For example I used the whites story on another forum as a base to plan on what I want to do with this one.
Wed Jul 06, 2022 9:47 am

Not So Moderator
VNB vsc o9c VMA vbc VSX
Joined: 28 May 2008
Posts: 6402
Location: Hustletown, TX
 
Not So Moderator
VNB vsc o9c VMA vbc VSX
Joined: 28 May 2008
Posts: 6402
Location: Hustletown, TX
Wed Jul 06, 2022 9:47 am linkquote
Good looking scoot.
Wed Jul 06, 2022 11:20 am

Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
 
Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
Wed Jul 06, 2022 11:20 am linkquote
Are you married? Have a significant other? Pictures of scoot in what looks to be a shower? Living room? My bathroom isn't big enough for that, not sure about scooter in middle of living room either, wife would probably object to that. Nothing wrong with it just curious.
Wed Jul 06, 2022 12:09 pm

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Wed Jul 06, 2022 12:09 pm linkquote
Married. Told me though that she would not be spending the christmas under the same roof with a scooter. The orange GL was in the livingroom so I told her it was no problem. Finished the scoot and moved it to winter storage across the town on 22th of December. Told her also that I'd start working on this one shortly after Christmas

But yeah. It's nice to assemble clean parts inside especially when there is -25'c outside and I have no warm space outside the house. I also made sure that the loose parts go back into the boxes for the night and things stay neat. Teached my kids some things too about working on these things. There was also no fuel anywhere when assembling so it was completely odorless. Once fuel is added, it's a point of not going back inside.
Tue Jul 12, 2022 3:00 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Tue Jul 12, 2022 3:00 am linkquote
Threw in LTH Midrange exhaust I had laying around on the scoot to accompany the Polini 133 and PHBL 24. Worked nicely but weird popping and wheezing on higher revs like it was lean. Upped the main jet to 140, no avail. Checked the ignition timing, spot on 18 degrees. Swapped in 300 needle valve, no help.

Gapping the spark plug to 0,5mm and the scoot began working quite well. Just finished working my way down step by step to main jet 105. It seems like my HP4 ignition and Ducati coil need quite tight spark plug gap to fire on higher revs.


Not so cramped under the tank on this one
Tue Jul 12, 2022 5:51 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Tue Jul 12, 2022 5:51 am linkquote
And some video of the engine running:
Tue Jul 12, 2022 9:43 am

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
Tue Jul 12, 2022 9:43 am linkquote
That thing sounds amazing!
⬆️    About 2 months elapsed between posts    ⬇️
Mon Sep 05, 2022 5:15 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Mon Sep 05, 2022 5:15 am linkquote
I was not completely satisfied with the power delivery of the engine. Sounds nice and pulls good until shifting to fourth gear. Just not enough pep to pull the 4th comfortably. With Polini banana it worked more the way I like it. Maybe a short fourth would benefit the engine but I think I'll just go back to banana exhaust.

Since swapping exhausts requires hinging the engine down, I dropped the whole engine.


Altough the engine has reeds, there is a Pinasco rotary-type crank inside of it. I have a full circle one in my shelf and will swap that one in. Going to throw the Pinasco to my next smallframe engine which will be rotary inducted.


On the table, oil drained and ready for further disassembly.
Mon Sep 05, 2022 6:06 am

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
Mon Sep 05, 2022 6:06 am linkquote
I'm following along, of course.

Feed your gearing into SDJohn's spreadsheet he posted somewhere, compare that to where you get into your power curve, and let it tell you what to do with 4th.

If you have OpenOffice (an excellent open source alternative to the MS Office suite), I have my gearing-to-measured-actuals spreadsheet that can help estimate how much power you need to overcome air resistance, too. It uses OO native macro's, so opening it in Excel will get you the basic calc's, but not the required power estimates.

I need to do a version that incorporates John's gearing tables, I just haven't gotten around to it.
Mon Sep 05, 2022 6:20 am

Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 6497
Location: San Diego, CA
 
Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 6497
Location: San Diego, CA
Mon Sep 05, 2022 6:20 am linkquote
DRT makes multiple short 4th / short 3rd & 4th trees, definitely pick something suitable if you are ripping the engine down anyway.
Mon Sep 05, 2022 9:43 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Mon Sep 05, 2022 9:43 am linkquote
Ignition still looking good under the flywheel


Cylinder out and clutch side teardown. It's very close that you can remove the flywheel side case with the clutch in place but just barely not. The PK XL2 style pressure plate fought me for a moment before I managed to persuade it out.


Fourth gear on the xmas tree makes a little contact with the case corner and won't let it come off without pulling the clutch off.


No rotary pad here


I think I will not get a DRT shaft on this one. Already have one of those in white and I'll try to keep the powerband of this engine more down low.
Mon Sep 05, 2022 2:35 pm

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
Mon Sep 05, 2022 2:35 pm linkquote
FINYoshi wrote:
Fourth gear on the xmas tree makes a little contact with the case corner and won't let it come off without pulling the clutch off.
I learned all about this fun little fact the hard way today.
Wed Sep 07, 2022 4:47 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Wed Sep 07, 2022 4:47 am linkquote
Full circle crank in


Things looking near mint in the gearbox area. Shimmed the gearbox 0,15 tighter to 0,20.


Closing up again


27/69 straight teeth primary and BGM Superstrong clutch here. Buttoned things up and will be looking at cylinder next.
Wed Sep 07, 2022 2:33 pm

Molto Verboso
1958 Allstate 177VMC, 2005 70cc Yamaha Vino
Joined: 23 Aug 2020
Posts: 1098
Location: Philadelphia
 
Molto Verboso
1958 Allstate 177VMC, 2005 70cc Yamaha Vino
Joined: 23 Aug 2020
Posts: 1098
Location: Philadelphia
Wed Sep 07, 2022 2:33 pm linkquote
What is the color code for that yellow?
I love it and eventually one day wanna use it.
Wed Sep 07, 2022 9:16 pm

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Wed Sep 07, 2022 9:16 pm linkquote
I don't remember for sure, but it might be RAL 1018. I just went to the powder coaters, took a look at the boxes they had on their shelf and pointed out one that looked nice n' bright according to example flaps
Thu Sep 08, 2022 5:22 am

Addicted
Joined: 28 May 2020
Posts: 568
Location: Planet Earth
 
Addicted
Joined: 28 May 2020
Posts: 568
Location: Planet Earth
Thu Sep 08, 2022 5:22 am linkquote
The primavera and yellow go hand in hand, spring colour for a scooter named 'spring'. Drove one in the original yellow early 80s, loved it.
Sat Sep 10, 2022 10:39 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Sat Sep 10, 2022 10:39 am linkquote
Lapped the cylinder, spacer plate under it and head on top of glass surface and sheet of wet sanding paper. I really hope there will be no more weeping between cylinder and head.


Copper head gasket heated up with torch to soften it up. Smear of silicone to up the odds.


Put my new leak testing kit to use. I think it was a pretty good set for 50eur shipped:
https://a.aliexpress.com/_msBepBQ


Found a small leak between the reed housing and attaching screw, fixed with dab of silicone. Another small one from a pore of the weld got some Bison metallic epoxy to fix.
Sun Sep 11, 2022 1:14 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Sun Sep 11, 2022 1:14 am linkquote
Why haven't I bought a pressure test set before

This time I sticked a wooden skewer pin to keep one of the reed valve flaps open to make releasing the pressure faster. The previously fixed places now keep the pressure but found another source of leak.


Looks so innocent, but leaks from a pore. Not going to trust any case before it passes the pressure test in the future


Good brushing up, wipe with isopropanyl and apply Bison to seal up. Just ordered a handheld vacuum pump so in the future I can even use vacuum to pull the epoxy inside the path of the leak.
Sun Sep 11, 2022 5:02 am

Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
 
Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
Sun Sep 11, 2022 5:02 am linkquote
FINYoshi wrote:
Why haven't I bought a pressure test set before

This time I sticked a wooden skewer pin to keep one of the reed valve flaps open to make releasing the pressure faster. The previously fixed places now keep the pressure but found another source of leak.


Looks so innocent, but leaks from a pore. Not going to trust any case before it passes the pressure test in the future


Good brushing up, wipe with isopropanyl and apply Bison to seal up. Just ordered a handheld vacuum pump so in the future I can even use vacuum to pull the epoxy inside the path of the leak.

Interesting what you can find, when you start testing. Will save a mess in that area among other things, would have been pushing a little two stroke oil out.

Vacuum is a good idea, what do you plan on using for a pump?
Sun Sep 11, 2022 5:22 am

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 6498
Location: Nashville
Sun Sep 11, 2022 5:22 am linkquote
FINYoshi wrote:
Why haven't I bought a pressure test set before

Looks so innocent, but leaks from a pore. Not going to trust any case before it passes the pressure test in the future
Yassss!

Once you start doing it, you won't trust any build until you *know* it's airtight. There are so many ways that air can leak in and out of a motor, including where you never expect. I even found pores in the original castings. Easy fix, but that motor had never been airtight before I got it.

What's really interesting (to me, at least) is how such a simple and obvious test seems to have never been part of most engine builders' process until the few couple years. It's like we all *knew* that air leaks were bad, but also never actually checked to see if we had them other than looking for oil leaks in unexpected places.
Sun Sep 11, 2022 5:31 am

Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
 
Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
Sun Sep 11, 2022 5:31 am linkquote
chandlerman wrote:
Yassss!

Once you start doing it, you won't trust any build until you *know* it's airtight. There are so many ways that air can leak in and out of a motor, including where you never expect. I even found pores in the original castings. Easy fix, but that motor had never been airtight before I got it.

What's really interesting (to me, at least) is how such a simple and obvious test seems to have never been part of most engine builders' process until the few couple years. It's like we all *knew* that air leaks were bad, but also never actually checked to see if we had them other than looking for oil leaks in unexpected places.
May favorite so far is a leak I had through threads in a cylinder stud. Pulled stud out coated threads in motor sealant and put back together. Now I'm nervous about pulling head off to do anything.
Sun Sep 11, 2022 5:36 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Sun Sep 11, 2022 5:36 am linkquote
OCD level on the engine builds has gone up a notch
Sun Sep 11, 2022 5:44 am

Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
 
Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 3047
Location: Rochester, Minnesota
Sun Sep 11, 2022 5:44 am linkquote
FINYoshi wrote:
OCD level on the engine builds has gone up a notch
This is an example of why, when people say I'm using a main jet that is 10+ sizes bigger than average, people ask have you pressure tested to check for air leaks? You would have had air getting in, not through the carburetor, with no oil or fuel, causing a lean condition.
Sun Sep 11, 2022 11:37 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Sun Sep 11, 2022 11:37 am linkquote
Now I understand this better than before.

Found one more leak near the base of the cylinder but leaking downwards between the cases. Pulled the cylinder, cracked the cases slightly open and added a dab of silicone with flat headed screwdriver.


Now that the engine is keeping the pressure inside, it's time to button things up.


Going for the comfort with this engine so chose the trusty ol' Polini snail for exhaust.
Sun Sep 11, 2022 8:47 pm

Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 6497
Location: San Diego, CA
 
Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 6497
Location: San Diego, CA
Sun Sep 11, 2022 8:47 pm linkquote
Polini snail is really the workhorse of small frame exhausts. Easy on off, good power, nice sound. Winner for most purposes except flat out power builds.
Sun Sep 11, 2022 9:50 pm

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Sun Sep 11, 2022 9:50 pm linkquote
Yep.

I might swap it out to SIP Road Banana after I get a feel on how the current setup works without the air leaks

According to SIP dyno chart it has bit higher peak HP but overall it falls off faster than the snail. But that is with the stock cylinder so just have to try it out how it feels with the reed inducted Polini.
Mon Sep 12, 2022 4:10 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Mon Sep 12, 2022 4:10 am linkquote
Running happily again. Have to lean out the main jet a tad or two.
Mon Sep 12, 2022 1:34 pm

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Mon Sep 12, 2022 1:34 pm linkquote
Discovered a fountain under the tank. Click for video


Jetting should be still on the safe side. Click for video.


Took her for a short ride
Tue Sep 13, 2022 3:43 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Tue Sep 13, 2022 3:43 am linkquote
Ran some thin hoses from the carb vents to outside of the frame just in case the carb wants to puke on over-revs. Don't want to be sitting on bunch of fuel-air mixture just waiting for a source of ignition


Engine works beautifully now. I'm glad I did not go for the shorter gearing side shaft since the Polini snail is really torquey exhaust. I can lob around on fourth with really no revs at all. If the speed is anything over 50kmh, there is no need to shift down. Just open the throttle and the engine pulls from there to 110kmh effortlessly.
Tue Sep 13, 2022 6:44 am

Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 6497
Location: San Diego, CA
 
Veni, Vidi, Posti
'15 GTS300, '86 PX125EFL, '66 VBB, '04 Ninja 250
Joined: 04 Apr 2013
Posts: 6497
Location: San Diego, CA
Tue Sep 13, 2022 6:44 am linkquote
FINYoshi wrote:
Discovered a fountain under the tank. Click for video



I just finally watched that video, OMG
Tue Sep 20, 2022 9:27 am

Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
 
Hooked
Parmakit Primavera -74, Polini Primavera -68, Stock 150 Touring -59, VMC 177 Bajaj Chetak 125 -95
Joined: 22 Jun 2022
Posts: 388
Location: Finland
Tue Sep 20, 2022 9:27 am linkquote
Saw a perfect spot to snap a photo of this scoot on my way to work. I've waited for the right colors for a week and now the weather was nice for taking the scoot for a ride. Unfortunately sun hid behind the clouds just the moment I laid my backpack down to grab my camera. Turned out nice anyway, but a little sun would have helped to even further bring out the colors.
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