Modern Vespa

So engine is running great, carb is pretty much perfect…

Then I found this again whilst cleaning up… forgot I had an adapter made to make a large manifold fit a small manifold intake.

It might run terrible because it's even longer now.

But in the name of experimentation…!

I feel like this is going to be asking for punishment.

Yeah it's all placebo/trust at this point… no one seems to have any numbers.

A Taiwanese fella did some tests on a dyno, BUT no cover installed though and ran temp tests as scientific as possible (shrug…) (warmed up engine measured at same temp, same timed run at WOT)

The fancy fans worked. Cooled 10-15deg vs SIP fan.

Yeah the heat shield is a bit of a sail at the moment… took off the cover and revved to 8-9000rpm it flinched a bit, bounced of the exhaust and goes back in place. After 50kms, still seems to have not moved too much.

But I did think about the aluminium plate alternative… I'll probably beat on into shape coming soon.

Life is full of bad decisions… I feel like this is one of them…

EDIT:
Took it for a spin 45, BGN, 144, Polini jets. Went like a rocket with a turbo...

Tried 42 and BGM in various combinations and couldn't keep idle.

Super rideable which was surprising, but still need to test it properly, might end up 146 or bigger I think.

This is the sort of experimentation I can get behind.

I'm on the fence whether to move forward and buy a bigger manifold.

Fuel economy is already not as good as a phbh, but it's not far with the vhsh. When I had the airstriker on the 210 it was already pretty bad. But it was super fun.

Then there's the jetting journey. I think it's 70-80% there. But makes me wince thinking about it.

Happens all the time, when things are good, I try something new. It's like it's never ending… lol

I'm gonna ride around a few days as see how I feel about it.

The airstriker is showing up the jetting issues with the VHSH. If that is jetted from scratch, I'm really sure it will end up better than the airstriker.
I've never seen a K98 used on anything but a 125. It's going to need a richer needle than that with this set up.

After about 6 hours of riding around, ended up on:

45 pilot
3 turns air screw
BGM 2nd clip
146 main

Rides like a motorcross bike. Sounds insane with all the air sucking through. Got lazy and should have gotten some video.

Needs a bit more testing to double check 1/2 throttle to see if it's rich enough.

But fuel economy is an issue. Around 25kms on 2litres. So jumped back to the VHSH, nice and safe with the jetting.

Really can't be so invested to keep testing.

You know Egig has updated jetting for the VHSH, B36 and K57 needle?

After a while... How have you been preparing? Can you tell us a little? Experience and how you are doing today. Thank you!