Modern Vespa

You clutch is more like SIP Cosa 2 Sport, not Ultrastrong one.
I have same on my P.

Looking good brother!

Yep, looks like you're correct. I get all the friggin names mixed up in my noggin. strong ultra strong, super duper maxie molleergollawhatevertheeff. lol. It works, thats what I know.

I've been slacking on my progress updates.... but I'll just leave this here anyway

Wooohooo! Most Excellent brother!

Listen to all that goodness! It was worth the wait.

Just got back from a successful shakedown ride! About 40 miles or so. Still some fine tuning to do on jetting the top end, but this thing rips!!!

Long time since update here, with a few miles put on this build since then.

The latest and greatest is that after a bit of a long ride yesterday, the exhaust pipe header cracked and split apart. Thankfully within pushing distance of home, so the hassle of it all wasn't really a hassle at all. That said...there may be more going on here; so I will dive deeper.

For reference the expansion chamber pipe is an SIP Performance Racing Exhaust 2.0, made by Jim Lomas.

https://www.sip-scootershop.com/en/product/racing-exhaust-sip-performance-20-material-steel-clear-coated-carbon-silencer-color-silencer-carbon_22130CA?usrc=Racing+Exhaust+200cc

A refresh on the Engine specs: 60 stroke mazzy bell crank, Malossi sport cylinder, with wider/taller exhaust port work, port timings: 129°/187°=29°blowdown, 28ccc head by Al Harpman, bgm reed block on mrp inlet, Dell phbh 30: 55 idle/x13 needle/ 148 main (? have to check), Vape variable ignition.

Since I've put some miles on, and also feel there is more going on here, I'll be diving deeper and will report back

If someone had asked me yesterday, I would have said those exhausts were made by Nordspeed. I even had one last year, which I sold on.

Quite some sporty set up there. I imagine it feels pretty quick. Depending on the atomiser size, that jetting could be a little under. Especially if set up by someone who races bikes. Exhaust looks like it's been getting to hot. Does it vibrate noticeably more when pulling hard?

Yes its quick, and fun; and not for everyone! Powerband kick's in about 4500, and pulls to 9000+ before flattening out. I cant really say it vibrates more when reving up, I'd say its about the same.

Agreed the jetting is probably on the lean side right now. I have had it richer than that before this weekend, so perhaps I dropped it down a bit too much. I've been going back n forth on the jetting as I've been out, and put on the most road miles over the past few days since being built. I'm going to richen up all circuits and work back down again. I'll check the attomizer, I think its 266

Temps are steady at 260-270+/-, creeping up to 300 if really thrashing it wot for a stretch; and then drops right back down to the steady zone. Trailtech sensor under the top inside stud.

First quick observation - the exhaust mounting bracket that attaches to the swingarm was loose, so much so that with the header pipe disconnected the main body (the heavy part) of the pipe can move and flop around like a fish.

I'm sure this contributed to the breakage, as there is only so much flex with the spring mounting.

Well that doesn't help. And will be why it broke. Sounds like you'll have it welded in no time.
CHT temperature on a cylinder stud is something like 50F cooler than the plug. If that means mid cruise is at 320F under the plug, then that explains the blueing.

Interesting point about the temps... I hadn't realized it would be that much difference. Mos def need to richen things up a smidge or 7!

I appreciate your input.