Setup 2007 Stella with DR177 DR 177, Sito +, 23 Tooth Clutch
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Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Dec 29, 2019 10:36 am quote
The head still has a few pits but a lot of the surface did clean up. Not sure how aggressive I really want to get with removing material and increasing head volume and increasing the squish.

Measured the exhaust port this morning, raised the center large port up about 0.5 mm cleaning up the casting marks. Should I try raising up the two auxiliary exhaust ports either side of the larger main exhaust port to match? If so what can a person get in there to clean them up? Should I try and clean up the exhaust path more? I can see ripples still, better than what I started with, just not sure how aggressive I should get.

Moving the exhaust port up 0.5 mm, and still 1.0 mm shim under the barrel to set squish that puts me at the following

169.04 exhaust
116.21 transfer
26.41 blow down

2019-12-29_11-50-09_758.jpg
After

2019-12-27_19-06-04_432.jpg
Before

2019-12-29_11-50-57_133.jpg
Exhaust port cleaned up nicely, need to figure out what to do with the two small ones. Raised the middle port about 0.5mm cleaning up the casting. Didn't realize that I cleaned so much off until I measured just now.

2019-12-29_11-49-53_346.jpg
Not sure how aggressive to get here either.

Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Dec 29, 2019 6:28 pm quote
I wonder about using these centering bushings on a DR 177, I know I can rotate the cylinder around on the studs, and the head also. The piston sits below cylinder so it's not going to hit the head.

https://www.sip-scootershop.com/en/products/centring+bush+sip+for+sip+t5_17729000
Ossessionato
05 Stella, '62 VBB, 76 Sprint V, 63 GL
Joined: 16 Jun 2011
Posts: 2309
Location: Chicago. Well, Evanston, but that's almost Chicago
Mon Dec 30, 2019 5:38 am quote
A transfer timing of 116 seems crazy low. Ditto the exhaust. When you measure the port timing, how much clearance is there between the base of the ports and the piston at BDC?

Other than that and possibly flattening the top of the exhaust port, you're looking good.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Mon Dec 30, 2019 1:35 pm quote
chandlerman wrote:
A transfer timing of 116 seems crazy low. Ditto the exhaust. When you measure the port timing, how much clearance is there between the base of the ports and the piston at BDC?

Other than that and possibly flattening the top of the exhaust port, you're looking good.
Thanks, for the suggestion on the exhaust port, I was studying it more last night, and traced it along with the two auxiliary exhaust ports, noticed the main exhaust port isn't perfectly symmetrical, need to clean it up a bit. I can put an old ring in and get a better look, maybe flatten out the top a bit at the same time.

I'm not sure on the clearance measurement between the base of the ports and the top of the piston or top ring at BDC. Visually the ring was below the ports when I looked. I know there was a 0.25 mm aluminum base gasket between the base of the case and the cylinder previously. From what I have seen it was the default gasket that comes with the kit. It was installed purely plug and play no work was done to the kit. I'm putting in a 1.0 mm gasket in to increase timing and hopefully get my squish to about 1.0 mm after taking the 2.50+ mm of the squish band off the head.

My plan currently is to run it with a 1.0 MM base gasket to start with and see how it runs. As others have said I can take material off the top of the barrel and move it to the bottom to see how I like it. Would like to get a baseline established with a decent squish before I take any of the barrel off. I've already done more at once than I would like to, but board and most could be unbolted if needed.


The day I brought it home it didn't want to go much over 50 MPH, who knows now.

Last edited by Christopher_55934 on Mon Feb 24, 2020 5:30 am; edited 1 time in total
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Mon Dec 30, 2019 2:06 pm quote
My list of changes so far
To help me keep track, of changes I've done so far, will add to as I go along.

The day I test drove it and brought it home it was cold below freezing. I rode it wide open in 4th and couldn't get over 50 MPH or 80 KPH.

Next

Boyesen Reeds
Cut the center support out of the reed block
Blended the parts in the carburetor reed block stack to flow better
55/160 Idle Jet 160, Be3, 110 main jet
Drilled heart in air filter
Cleaned up carburetor, installed new gaskets, drilled hole from fuel bowl to main jet to 2.0 MM and blew out all openings with compressed air.

Started and ran on center stand at this point, to cold and snow on the ground didn't do anything else. Since it still seemed to run fine on the stand I moved on to other projects

Opened up the DR cylinder base, two large ports on the side to match the LML case openings.
Opened up the LML third small port in the case from 20 mm to 25 mm to match DR cylinder.
Cleaned up exhaust port and moved it up 0.50 mm, on accident mostly just material removed to clean up casting around port.
Reduced squish from 2.5+ mm to what should be 1 MM by removing material from head.
Removed a 0.25 mm base gasket, installing a ~1.0 mm base gasket to set squish at 1.00 mm and increasing timing.


Ordered the spacer for the cylinder and gaskets and want to get it back together as is and make sure she starts and runs. If that all works I want to move on to timing

Next up I would like to establish Top Dead Center and timing marks and install a Kytronik. Looks like I can install it set it to "0" initially make sure it works and set it to a conservative 6. I like the idea if having a timing curve the same as vehicles have had since the early 1900's. After I get things dialed in better I can push the limits more on the timing, I figure a conservative something should e better than nothing.

https://www.kytronik.com/collections/kytronik/products/smart-booster2016-2
Enthusiast
Vespa Sprint 150
Joined: 17 Jan 2019
Posts: 80
Location: Portland OR
Mon Dec 30, 2019 3:28 pm quote
If you want a curve, wouldn't the SIP VAPE setup be better because you get a better stator? https://www.sip-scootershop.com/en/products/ignition+sip+performance+by_51005sa0
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Mon Dec 30, 2019 6:02 pm quote
notbenh wrote:
If you want a curve, wouldn't the SIP VAPE setup be better because you get a better stator? https://www.sip-scootershop.com/en/products/ignition+sip+performance+by_51005sa0
I really don't know, that setup looks like it replaces the charging system and the ignition system. Looks like a proprietary system and replacement parts would have to come from SIP. I would rather not be tied to them for parts of needed.
Ossessionato
05 Stella, '62 VBB, 76 Sprint V, 63 GL
Joined: 16 Jun 2011
Posts: 2309
Location: Chicago. Well, Evanston, but that's almost Chicago
Mon Dec 30, 2019 6:21 pm quote
Christopher_55934 wrote:
Looks like a proprietary system and replacement parts would have to come from SIP. I would rather not be tied to them for parts of needed.
They're all proprietary to someone. Now we're just debating who's more reliable over the long run.

SIP sourced the parts from VAPE, who OEM a tremendous volume of motorcycle ignitions, so that's pretty darn reliable as these things go, IMO.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Mon Dec 30, 2019 7:48 pm quote
chandlerman wrote:
Christopher_55934 wrote:
Looks like a proprietary system and replacement parts would have to come from SIP. I would rather not be tied to them for parts of needed.
They're all proprietary to someone. Now we're just debating who's more reliable over the long run.

SIP sourced the parts from VAPE, who OEM a tremendous volume of motorcycle ignitions, so that's pretty darn reliable as these things go, IMO.
Oh geeze, let's not go down this rabbit hole. I may go down it at some point if I want better charging etc, just not right now. I like to be able to get parts on eBay if I want them, don't read anything else into it.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Jan 05, 2020 4:39 pm quote
Scootering Magazine Bid Box Exhaust Test
I read this exhaust review and found it has my Sito Plus Exhaust. Looking at the review it gives out at 6500 RPM or so on a PX200E. Not sure what a Stella 150 will do.

https://www.scootering.com/the-vespa-big-box-exhaust-test/

I had found and read this one a few times but my Sito plus in not in there, not good for comparison

https://scooterlab.uk/vespa-big-box-exhaust-shootout-feature-2/


Is this correct for gearing selection on a 2007 Stella 2T if I upgrade the clutch gear to 22 teeth? From what I have read it should be 21 teeth factory.

I have been looking at this calculator and trying to figure out the rpm I need to get to 60 MPH. My local speed limits changed the 1st of the year to 60 mph and I would like to try and keep up with traffic.

https://www.scooterhelp.com/cgi-bin/vespa.gear.calc.pl

You selected:

A 22/68 primary drive gear combination
A late PX150EFL standard gearbox
A 3.50 x 10 rear tire size

Looks like the Sito might work for awhile until I get a feel for the scooter and running it at 60 MPH.
Molto Verboso
1980 P125X, 1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 1564
Location: Staten Island, NY
Sun Jan 05, 2020 5:23 pm quote
Yes that is correct gearing in the gear calculator. Sito plus is an old box email, there are many better ones out that you can eventually upgrade to. I doubt you will be getting much over 60 or just barely hit it under ideal circumstances. My 2005 Stella stock with sip road xl got about 57mph at best, with Malossi 166 pnp I could get 63-65 with one or twice hitting 67
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Jan 05, 2020 5:35 pm quote
swiss1939 wrote:
Yes that is correct gearing in the gear calculator. Sito plus is an old box email, there are many better ones out that you can eventually upgrade to. I doubt you will be getting much over 60 or just barely hit it under ideal circumstances. My 2005 Stella stock with sip road xl got about 57mph at best, with Malossi 166 pnp I could get 63-65 with one or twice hitting 67
Thanks for the calculator confirmation.

You had a SIP road xl on a stock 150? What did you think of it? That is one of the exhausts I was looking at using with my ported DR177 today. There was a BGM in there that looked good also.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Jan 05, 2020 6:43 pm quote
I was looking at my scooter to do list for the spring. I have a note in there about the clutch being really grabby, I've been riding motorcycles for years, but I had a hard time letting off the clutch slow enough to not feel like I was dumping the clutch.


Would I need to replace my entire clutch to try out a 22 tooth clutch?

http://www.scootermercato.com/Scooter-Parts/Complete-Clutch/113140
Molto Verboso
1980 P125X, 1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 1564
Location: Staten Island, NY
Sun Jan 05, 2020 6:46 pm quote
No you can just swap the gear cog in the clutch from 21 to 22. Make sure you get the right one for the engine.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Mon Jan 06, 2020 4:48 am quote
swiss1939 wrote:
No you can just swap the gear cog in the clutch from 21 to 22. Make sure you get the right one for the engine.
Do you happen to know what a 2007 Stella has for a clutch? I need to call scooter mercato and ask about tools I might need to get the clutch out.
Molto Verboso
1980 P125X, 1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 1564
Location: Staten Island, NY
Mon Jan 06, 2020 5:16 am quote
Same clutch. No changes between 05-07
Ossessionato
05 Stella, '62 VBB, 76 Sprint V, 63 GL
Joined: 16 Jun 2011
Posts: 2309
Location: Chicago. Well, Evanston, but that's almost Chicago
Mon Jan 06, 2020 8:19 pm quote
You probably want to replace the plates while you're at it since you're ordering parts anyway.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Tue Jan 07, 2020 4:16 pm quote
chandlerman wrote:
You probably want to replace the plates while you're at it since you're ordering parts anyway.
I ordered clutch tools, once I get it apart Ill inspect it. I figure plates at a minimum, who knows what other surprises await me. I want to switch over to 22 teeth I'll see what the rest looks like.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Wed Jan 15, 2020 3:36 pm quote
1 mm paper base gasket compressed thickness
Anybody know what a 1 mm thick paper base gasket compresses to? Ordered a couple of paper gaskets thinking they would be thinner and I was wrong. I now have a 1mm aluminum base gasket and two 1 mm paper base gaskets.

A 1.00 mm aluminum base gasket puts me at a hair less then 1.0 mm for squish. With no gasket the dome of the piston contacts the head by a hair. Timing will be 172.32 EX and 119.49 Transfer.

1.25 mm base gasket puts me at a squish of about 1.25 mm with timings of 173.35 EX and 120.84 Transfer.

Thinking about putting it together tomorrow with the 1mm aluminum base gasket to measure piston below top. I'm somewhere to close to zero to get a good measurement currently.

If I'm that far might has well stick the head on and measure squish also.

Anybody have and recommendations of where to order thinner gaskets. I opened up the ports on my dr177, a Malossi base gasket is better the Dr base gasket isn't a good fit with the porting.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Wed Jan 15, 2020 3:52 pm quote
DR177 63.0 Rings
Anybody know who has 63.0mm rings in stock, I think they are 2.0 mm thick? SIP is out and do is Scooter Mercato.
Molto Verboso
1979 P150X, 1983 P200E, 1987 T5, 1996 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1761
Location: Veria, Greece
Wed Jan 15, 2020 3:54 pm quote
Christopher_55934 wrote:
Anybody know who has 63.0mm rings in stock, I think they are 2.0 mm thick? SIP is out and do is Scooter Mercato.
SCK has them...
https://www.scooter-center.com/en/piston-rings-set-dr-vespa-177cc-63.0mm-1320011?number=1320011
Molto Verboso
1980 P125X, 1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 1564
Location: Staten Island, NY
Wed Jan 15, 2020 4:08 pm quote
I ordered an aluminum shim set from McMaster which comes with 10 sizes so you are able to cut your own and combine them to get a more precise base packer. I actually just cut two sheets today (0.24 + 0.06) to get 0.3mm in addition to the Malossi 1.0mm gasket for my 1.3mm base needed to get timing just right.

https://www.mcmaster.com/shim-stock-sheets
Kit is more enough you will have plenty for years if all you are doing is Vespa gaskets.



Total price: $68 shipped. But that should last me forever.

IMG_20200115_133754.jpg

IMG_20200115_134025.jpg



Last edited by swiss1939 on Wed Jan 15, 2020 7:23 pm; edited 2 times in total
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Wed Jan 15, 2020 4:17 pm quote
https://www.mcmaster.com/9536k51

Is this the one you bought?
Molto Verboso
1980 P125X, 1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 1564
Location: Staten Island, NY
Wed Jan 15, 2020 4:19 pm quote
Christopher_55934 wrote:
https://www.mcmaster.com/9536k51

Is this the one you bought?
Yes. Updated post before with total price $68 shipped but it will last forever for me

Also as these guys have suggested to me, using multiple base gaskets needs gasket sealant on all sides of each layer to fully seal the base packer sandwich. I'm using motoseal by permatex.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Wed Jan 15, 2020 6:25 pm quote
swiss1939 wrote:
Christopher_55934 wrote:
https://www.mcmaster.com/9536k51

Is this the one you bought?
Yes. Updated post before with total price $68 shipped but it will last forever for me

Also as these guys have suggested to me, using multiple base gaskets needs gasket sealant on all sides of each layer to fully seal the base packer sandwich. I'm using motoseal by permatex.
Going to use copper spray gasket, also thinking some paper gasket material would be nice.

This is what I have and have used in the past.

https://www.amazon.com/Permatex-80697-Gasket-Hi-Temp-Adhesive/dp/B000HBNUDQ
Molto Verboso
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 1668
Location: London UK
Wed Jan 15, 2020 7:15 pm quote
Re: DR177 63.0 Rings
Christopher_55934 wrote:
Anybody know who has 63.0mm rings in stock, I think they are 2.0 mm thick? SIP is out and do is Scooter Mercato.
2.0mm rings are the worst for performance. Just saying.

Thick paper base gaskets tend to make the head go loose. Use aluminum ones if you can.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Thu Jan 16, 2020 7:42 am quote
Re: DR177 63.0 Rings
Jack221 wrote:
Christopher_55934 wrote:
Anybody know who has 63.0mm rings in stock, I think they are 2.0 mm thick? SIP is out and do is Scooter Mercato.
2.0mm rings are the worst for performance. Just saying.

Thick paper base gaskets tend to make the head go loose. Use aluminum ones if you can.
Is there a ring that will fit the DR piston I have, that tapers from 2.0 mm to 1.0 mm? Currently just using what I have and and cleaning it up a bit to see how she runs.
Molto Verboso
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 1668
Location: London UK
Thu Jan 16, 2020 7:02 pm quote
The only way to change to thinner rings is to replace the piston. If you really like the DR this might be worth the cost but there are a lot better kits that come with thin rings.

The one thing I would suggest where the most power benefit will be made is to set the cylinder with the thickest aluminum base packer you can to up the transfer time. The DR head is not so high tech and will run a squish up to 1.5mm and not notice so much.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Fri Jan 17, 2020 7:15 am quote
Jack221 wrote:
The only way to change to thinner rings is to replace the piston. If you really like the DR this might be worth the cost but there are a lot better kits that come with thin rings.

The one thing I would suggest where the most power benefit will be made is to set the cylinder with the thickest aluminum base packer you can to up the transfer time. The DR head is not so high tech and will run a squish up to 1.5mm and not notice so much.
I would like to get the setup I have running better first, I enjoy reading and tinkering to make it better. This is only the second two stroke motor I've worked on. I have a full size Indian Chieftain with a 111 cubic inch motor that I use for any longer trips.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sat Jan 18, 2020 3:57 pm quote
Braved the Minnesota Cold Today
Have the day off from work today, went out and measured my squish and piston below top with a 1 mm spacer on the base. Now the measurements are firmer and less guesstimate since I could measure PBT. My piston below top guesstimate of 0.0 mm was correct. The 1.00 mm aluminum base gasket is 1.05 mm according to my calipers, I get a PBT of 1.05 - 1.11 mm depending on where I measure. My squish is a bit less but not much, as I expected. Now I need to figure out what I want for transfer timing for sure.

The question is ?
1) Keep the squish at 1.00 mm with timings of EX 172.32 / TR 119.49 / BD 26.42

2) Set the squish at 1.50 mm with timings of EX 174.36 / TR 122.16 / BD 26.10

3) From reading I've done it would put me at the top end of torquey touring or the bottom end of revvy, with 2.00 mm wide rings not sure I want revvy. Get the cylinder shaved 0.75 mm, that would leave about 0.25 mm stand off. Want to leave a small standoff for sealing purposes. The piston would still be 1.00 mm below the top of the cylinder, giving me a 1.00mm squish, EX 175.38 / TR 123.48 / BD 25.95.
Molto Verboso
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 1668
Location: London UK
Sat Jan 18, 2020 7:22 pm quote
The fastest is option 2. The DR has 3 exhaust ports which give it more while having less duration. You can tell I don't like the 2mm rings but they will do 7500 rpm and not break.
I too ride bikes regularly but the scooters are just more exciting.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Jan 19, 2020 4:13 am quote
Jack221 wrote:
The fastest is option 2. The DR has 3 exhaust ports which give it more while having less duration. You can tell I don't like the 2mm rings but they will do 7500 rpm and not break.
I too ride bikes regularly but the scooters are just more exciting.
Lol, yeah you would like my 70cc, 10,000 + rpm, single 1mm ring and chambered pipe scooter. Don't expect to get a lot of miles out of that setup. The 0-35 time is literally less the half of What it was when I started.

What do you mean by fastest being number 2? I was surprised to read you didn't like option 3 better. More compression and higher timing.

Now I'm going to have to put it back together again and look at my exhaust port to see if I should lower the bottom or not after reading Swiss's post. I know it was close but didn't think about it being even or a little below piston top.

I figure I'll make my mistakes with this setup and if I think I need more I'll get something like a BGM 177. I should be confident enough to do that in my garage in an afternoon at that point. I'll have more general tuning experience with this scooter and setup then.

Still a few months here minimum before it'll be warm enough to venture out.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sun Jan 19, 2020 5:05 pm quote
Grand Sport Rings Instead of DR Rings?
Would these rings be worth the uograde?

https://www.sip-scootershop.com/en/products/piston+rings+grandsport+177_20601950
Molto Verboso
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 1668
Location: London UK
Mon Jan 20, 2020 7:43 pm quote
Grand Sport rings are good but only fit a Grand Sport piston. And a Grand Sport piston is nearly as expensive as a new 177 kit.
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1247
Location: UK (South East)
Tue Jan 21, 2020 4:35 am quote
I bought some GS 63.0mm rings four years ago. They fit either the DR or Polini 177 pistons. They are the same thickness in the piston grooves with much better quality and appeared to be slightly chamfered where they meet the cylinder wall.
Hooked
Joined: 14 Jun 2016
Posts: 100
Location: Macedonia
Sat Feb 01, 2020 12:22 am quote
chandlerman wrote:
If you can do it, try to get your port timing up to 124TD/172ED. That'd match a Polini 177. You'll probably find that's not possible without altering the ports in the cylinder. I have some blown up DR's on the shelf. I'll get some measurements and see what they might look like by default.

You'll also want to cut the bar out of the reed cage and possibly widen it. Then, blend/flow all the channels. Carb to airbox, airbox to reed block, reed block to case, cylinder ports to case. This would be the time to open it all up, too, especially the ports on the DR.

You're already into my Porting 101 thread, which covers a lot of this.

Once you have your port timings sorted and everything flowed, then you can worry about squish. I've always found that squish on the DR by default is in the neighborhood of 2.5mm by default, so be prepared either have the cylinder or head milled down, or spend some quality time lapping the head.

You're using the stock ignition, right? You'll need to adjust timing to 18 degrees BTDC, too.

Good luck!
Dont mean to thread hijack, but I'm in the middle of fitting a DR177 to a friends 2012 PX150 and I need some help, so thought I ask someone here that is further in the DR tuning rather then start another DR177 thread.

He has a new 60mm mazzuchelli crank to go with the kit.
I test fitted everything and all looks great, but I got high cylinder transfer timings.

With a 1.5mm base packer I got:

Exhaust 172
Transfer 127
Blowdown 23
Intake opens 109
Intake closes 66
Intake time 175

My question is this tranfer timing really too high, cause Freak moped says that on one of his videos, or will this work and I can start closing the engine.

I'm also attaching a photo.

Vlatce_PX150_25_01_2020_1merenje_Zaokruzeno.jpg
Online calculator

Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1247
Location: UK (South East)
Sat Feb 01, 2020 2:11 am quote
Most of the reading/research that I did several years ago suggested that a 60mm crank is not a good companion for the DR177 kit. Maybe try a 1.5mm head gasket instead, or 0.5mm base and 1.0mm head.
Hooked
Joined: 14 Jun 2016
Posts: 100
Location: Macedonia
Sat Feb 01, 2020 2:53 am quote
swa45 wrote:
Most of the reading/research that I did several years ago suggested that a 60mm crank is not a good companion for the DR177 kit. Maybe try a 1.5mm head gasket instead, or 0.5mm base and 1.0mm head.
Thanks for the reply Swa45, I considered adding a thicker head gasket, but then what do I do about the squish?

I know some metal needs to be taken off either the head or the cylinder, but will this be wise to do, cause I dont think there is a lot of meat on either?
Molto Verboso
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 1668
Location: London UK
Sat Feb 01, 2020 3:20 am quote
Same. 0.5mm base. Whatever head gasket gets less than 1.0mm squish.
Hooked
2007 Stella 150
Joined: 02 Nov 2019
Posts: 218
Location: Rochester, Minnesota
Sat Feb 01, 2020 6:18 am quote
From my research, those timing numbers will create a lower torque motor that likes to rev to a higher rpm. A DR kit isn't a higher revving cylinder kit with the 2mm wide rings. I read somewhere that 7000 or 7500 rpm is max for 2mm wide ring.

My notes have a 118-122 as a torquey touring setup, 123 and above as a higher rpm setup. As the transfer numbers move up you get into a higher revving lower torque motor.

I may have missed it in the reading but what are you getting for squish? Taking 1.5mm off my squish by putting in a 60 mm crank wouldn't have hurt a thing and actually would have been a bonus. My squish was 2.5+mm, so taking off an entire 1.5mm would have put my squish at 1.0+mm, that would have saved me from removing 1.5mm from my head. I had contemplated buying a 60mm crank which would have put my squish and timing numbers where I wanted them with no head work, cylinder work or anything else. I've never split a case, don't have the tools yet and went with learning and working on what I have.
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