Modern Vespa

Standard bore, the one that came out had no markings.

Sigh, this is my advice : Not too late to cancel that order and use your dough to get a new stock mudguard instead of that cutdown fender, then you could remove the legshield chrome guards to be offered in as an extra for free. Maybe rack as well for a nice clean presentation(tell them how easy it is to install)? You're targeting a small 80's mod revival slice of an already small niche market. A good looking stock bike will just sell more easily IMO, and am I getting Deja Vu here ???
But Good luck however you go.

This is compelling: 1986 PX125E euro version. Compared to the earlier US market P125X, it has a fuel gauge, improved front braking, easier to shift and more robust EFL gearbox, and a larger glovebox. Side cowls are removed by lockable under-seat levers for better security.

[attachment-356371 "IMG_5204.HEIC"]

This not so much: This scooter has a custom cut front fender, crash bars, and chrome rack to round out an 80's mod revival look.

No letter on cylinder either??

Original piston has an O and a 4P

Cylinder has a code 10 36 04

New defective piston has an A and a 6s, and someone has scribbled 0.004 on there but it came in a box saying Std.

I already did the stock fender! And has a rack already.

Sorry, maybe update your pics in the For Sale section? And I meant remove the crash guards and rack, at least for some of your pics.

Yeah I'm going to relist it altogether, I will delete the old ad soon

OK, so original was a 0 and next tolerance is A (up to D) usually to make up for a bit of wear. Normally you should order a 0 but A should probably be fine…

What comes should be standard, the A is bent so it's going nowhere. Every dent has a high side somewhere, and that means seizing to me.

Even standard, they're still graded from 0 to D to match the tolerances of the cylinder, since they're never the same coming out the boring machine…

No... It's definitely not.

Looks like one of those garage days we all try to avoid. Serious bummer.

I really thought I was cruising when I had lapped the cylinder and head and given the required blood, but then it all went south .

I did something not entirely dissimilar this weekend. Mine was a prototyping fail, but still had a solid when I realized my mistake.

All the surfaces are cleaned, it's ready to go back together, piston will probably show on Tuesday or Wednesday. I think they are closed on Monday. Things show up one day later from the ship day when you live in the same city.

They do work today, piston tomorrow it is then!

For jetting - with the Malossi 166 and a Sito Plus I'm thinking to start at 120 for a main jet and leave the rest alone, does that sound reasonable? I think they used to give a 115 main jet in there for the 20.20 carb, which I'm using. I also have the drilled filter.

The rotary port and transfers will not be opened up. I know, I know, but I'm not going down that rabbit hole with a bike that will be sold.

It will be such a sweet ride, you will end up keeping it.

If I had 4 motorcycle parking spaces, it would likely be a keeper. A PX is a workhorse, always a useful thing. But looking at it realistically, I ride modern more than vintage in my regular routine due to speeds. Thus the current allocation of 2 moderns and 1 vintage. If it's fun then the VBB project will continue piece by piece until at some point I have to put it together.

now if you see me pulling out the expansion pipes from my stash and changing the center stand for a side stand, you'll know it's gonna be here for a while... they're up there, calling my name. i saw them just the other day.....

oh, I see you subscribe to my newsletter!

I'm hoping that it doesn't take as long as your:
-Rally 180
-Wheelie Super
-Lambretta
-ET4
-etc

I kiiiiiid, I kiiiid! If I joke too hard then you make me take the Rally and that is a serious project, so I'd better be careful.

I can keep at it with all sorts of ways to make my build shorter when it comes time though. Next items that can be done:
-fork rebuild
-bench seat tear repair
-rearrange my loft so the frame is out front, then bring it down for work as needed on surface rust with fast etch & owatrol oil as a weekend project
-bring it down again and cable / wire it
-electrical shakedown by use of power supply

the shoe cobblers' kids always go shoeless over here man...

I'm counting on that so you'll cave and sell me one of your supers sooner or later.

If I had even more space, I'd trade you this PX I can't sell for several more projects

I'd start with AC140/BE1/125 for the main stack on the Malossi.

All your inventory management problems are between you and Greasy, though.

Easy enough to go big and get that first step out of the way. 125 it is, gotta check the rest of the stack again. Pretty sure it's 140 but can't remember the atomizer.

New piston is an A also. Ring gaps are 0.013" and piston to bore as measured with a feeler gauge is 0.006", which is probably on the loose side, if my Lambretta Sticky manual can be used to judge.

these are my warehouse workers. does it look like they care about inventory management?



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SHIP IT!

Hmmmmmm….

Package tray / buddy seat base painted. I think I'm out of stuff to paint for now.

Here's the first start. She's alive! Noisy for sure. We are definitely on the loose side.

Here's a warmer idle video:

It's night and day, so fun. I am running a 124 main and it's not bogging out. Maybe that VBB build can wait a bit 😎.

Greasy seems to think she won't blow but it is loud!

it's too loose, let's face it. Mjrally has a honed one with fresh piston ready to go, I will pick that up and get this one bored out to first over for a later build.

I'd be pissed but honestly it was so awesome on my small ride today that I'm more enthusiastic than anything.

I was hoping the max .006" mentioned here would be ok. But it seems not.

Rearranging the loft to allow up and down for the VBB frame. Here's a mock-up. I think I can avoid painting this frame.

Those cowls came out good. My Polini kit rattled a lot when cold…a little less when warm. The VMC seems much tighter and just chuffs along. The piston to cylinder clearance on the 200 is .008-.009" (I think) according to the Haynes manual, which seems yuge.

wow, you are right. maybe the rings are so fat that they can stabilize it?!?!

0.215mm = 0.0085"

Fresh Malossi 166 first over from mjrally

Piston to bore 0.002"
Ring gaps were a bit on the smaller side near 0.008", opened up to 0.010" and 0.011".

Ready for install, thanks mjrally!