Modern Vespa

Enjoying the view from the cheap seats.
Remarkable build.

Side note:
Ginch - gotta say - you have a bit of an international reputation.

Dammit! You fuck one goat....

Ohh, so it's down to one goat now. The story I heard involved more like a herd..

In your defense, he was a good looking goat.

And he owned a lathe

Shiny...


Oh so shiny...

How much was it again?? $25 or something??
Really nice, but I now hate varnished exhausts after all the years I've dealt with them. First they go brown and then rust. I used to polish them, recreate the weld burns with a blowtorch and then re-varnish them. And repeat after a while

Only stainless from now on...

"Aedificare, abusu, confractus, repetere."

DRT 23 tooth primary cog goes in.

Love that the thread title states DR177, yet you have just purchased one of the finest expansion chambers available

If Carlsberg did overkill..........

We all know the DR177 is the gateway drug. Probably time I thought up a new title.

Current spec is:

Malossi MHR177
Mazzucchelli PX200 bell crank with 60mm stroke, 110mm conrod ,Grand Sport Gudgeon pin conversion bearing and custom packer 5mm packer.
LML reed 150 cases, JB'd and ported to match MHR.
Malossi 150 PBHB kit with PHBH 30, Malossi intake, reed and bellows, plus custom adapter to LML case - intake and case both milled and matched to 200 spec.
BGM Fast Fuel tap
Banded sip Cosa 2 clutch
23/67 primary ratio
p200 gearset with T5 4th
Liztor Selector with Sip quickroll
Koso digital EGT and AFR
SIP speedo and egt
Vespatronic at 23 degrees at 2500 RPM
Custom loom with battery for gauges, and usb charger
Sip Front shock with standard spring
KYB rear shock
Crimaz front disk
Detachable mapboard with DC driving lights

Like I said, gateway drug...

Sorry, just couldn't resist the comment. That's a great spec. you have there. I have been considering either S&S or Pipe Design myself. Looking forward to hearing how yours performs.

Yup. Ginch and jimscoot have helped a lot with it.

Ginch was encouraging me to go the extra mile and get a Pipe Design, but I have 2 (or possibly 3) more scooters to finish. Also, Jim's spec is almost identical, and he has the S&S, so I can follow along with his settings.

Certainly a nice spec now. And you're surely hooked. I think these parts make the fastest small block. The 23/67 will dull it down a little but still a great ride.
The set up is the tricky part. For the intial set up 300F is the maximum to aim for to ensure all the shiny parts stay shiny.

Yep. It's deffo a beast!

I ran it with the 22/67 and the Sip Road 2, and it's, umm, "sparkling" through the gears, but it's revving its ring off in fourth with the T5 36 cog 4th. (I put the 36 in when I was still planing on keeping the DR).

I put the 23 cog in the clutch to see it it would improve the short 4th without hurting performance too much. First impression is that blunts the performance just enough that having experienced the MHR on the 22/67, it's probably gotta go. The 22/67 is just sooo fun.

But - it's still on the SIP Road 2 while I wait for a sidestand to arrive in the mail.

When that happens, I'll switch in the S&S pipe, and try it with the 23/67 and the 22/67. Hopefully, the sparkle kicks back in.

If it's still not right, I'll bite the bullet, split it and switch in my spare normal 4th.

Jim, looking at the S&S there's nothing to tighten - how did you attach it to the cylinder? Just springs?

Thank god for three-day shipping from Germany... current rate - 15% of market price...

human kidney, 1 of

Just springs Craig..the header is quiet a loose fit onto the stub but it seems to eliminate the transfer of vibration.
Just like my old mx bikes really,
bit of spooge but seals quite well

This sleeve that ginch posted should have come with the pipe ??
Or am I missing something

I was experiencing quite a lot of vibration when coming on the pipe.
So I made up some polyurethane bushes to replace the hard nylon mounts.
The pipe now slightly flex’s but has virtually no vibration.

Nice one Jamie!

Cheers Jim,

I'm working late, cant lay my hands on the scoot and pipe at the same time. The adapter deffo came with the pipe. Am I right in assuming you use it to replace the Mallossi stub, then slide the pipe over it with the o-ring?

I take it you hi temp painted the pipe black? If so, did you strip off the varnish before hitting it with high temp, or just go straight over?

Ok never thought of it that way.
But no, im using the malossi supplied stub bracket etc. And the sspipe with installed sleeve
Yes its loose, but i like it that way

The exhaust came from Sip prepainted. To be honest i dont even know what version silent or super silent version. Did you buy direct from ss? If so how long did it take for delivery, cause on their website they mention 6-8 week turnaround??

Not sure if there's enough meat on this exhaust stub to machine an o-ring channel into?
If there was it would be an easy job.

If there's not then making a new one that was very slightly better fitting would not be impossible with your resources.

Third option is to make a new flange connection piece that has a slightly smaller ID.

Fourth option is coke can...

Snuck out of work today for an hour to get a bud to put in the O2 and Egt bungs.


Very hot glue gun.

I use a Red Bull can and some hi-temp sealant to seal my exhaust flanges. Works great and gives the scooter wings!

Yep, done it a number of times and probably will again!

Just wondering how your travelling with kit and pipe.
I've had a play with mine recently with some great results.
My Vespower static timing is now at +/- 18 degrees/3500rpm retarding to approx +/-13 circa 7000Rpm. I've lost torque but it has given me much more overev ability and able to sit on the pipe in the powerband. It's much smoother but my temps were to low if anything, only around 100 degrees c, on the freeway.
I've corrected my jetting now and I'm now running a leaner atomiser AV266 (was 268) corrected main 128, 40 slide X2 needle, 53 pilot.
Temps are now around the 120-125 celcius.
I've managed to claw back some of my lost torque now with a leaner transition from idle pilot slide atomiser, onto main. It was quite burbly there prior.

I recently purchased the lighter 900g Malossi flywheel. I dont recommend it as you loose torque hill climbing headwinds etc.
The 1.2kg seems perfect, but I think I could benefit with with more weight..Malossi supply add on weight options to the existing 1.2kg version so may try that soon.

The pipe is a monster, it took the MHR kit to a whole new level. The power and is like a kick in the pants.
Problem is that it’s too powerful for the early PX style gear set, and keeps powering out of gear, especially in 4th.
Have a Lusso style set coming, should be here on Monday for me to throw in. Currently in FNQ for a week, thinking of dropping into Modsorrockers to have a look at the Pinasco 225 9 port while I’m here.

If you buy one, just have them take the Pinasco kit off for you and short-circuit the whole process.

Never hurts to educate oneself.

Have you thought about a pointier needle? I think what you are seeing is that your set up has out grown the trusty old X2 needle? A needle like X11 is more like what I would expect to end up on. Will be a spluttery mess at first but once atomiser and pilot are sorted it will end up better.

I'll look into it Jack
I'm just playing with these needles at the moment highlighted in yellow.
Trying not to over think it too much and go with MB scooters most popular hits.

All these needles have a 1.8 tip. Which means they are for lower power. If you look down the list you can see they are some of the weakest needles that fit that carb. You think your scooter is low powered? This is why you need a big (268) atomiser to not overheat, the needle is too fat. Have a think about it or even better give it a try.

Thanks for your input Jack, I’ll give it a go

While your ordering get yourself an AS264 atomiser.
The AV series are 4 stroke compatible, roughly translated means a bit crap for a 2 stroke.

James - what gearing are you running? I need to figure out if the short 4th will be worth it, or if I should stay with the px200 standard.

Standard 150 gearing, with 22t clutch gear and 100/90-10 rear tyre

Time for a new gearset

Bolted and glued back together with a new gearset.

More chasing of air leaks over the last couple of days. The very thin cylinder faces left from the porting make this interesting, so I’d had a couple of goes to get the cylinder to seal.

I found and fixed everything I could, but there was still a tiny leak there somewhere - coming down from about 6psi to 4 psi over 20 minutes.

I was suss that it might be leaking out of the test fixture plate, so gave it a spray. The test liquid showed nowt till it ran down the face of the manifold, then low and behold...



Bubbles. Coming out of the side of the reed valve manifold.

So I hit it again.

(youtube link https://www.youtube.com/watch?v=PKR26MC7ajs


Looks like we have porosity.

I pulled out a scribe to mark the spot, and as soon as I touched it,



Boom.

Pulled the top off to have a look inside.



Looks like Malossi's tolerances are a little too tight.

Temporary repairs have been made via JB weld,



I'll check if it's airtight in the morning.

Last edited by Gt6MK3 on Sat Aug 03, 2019 8:35 am; edited 1 time in total