OP
UTC

Enthusiast
Joined: UTC
Posts: 59
 
Enthusiast
Joined: UTC
Posts: 59
UTC quote
I was given a Polini exhaust for my smallframe (stock carb and everything else). Any advice on what main jet to use? I started with a 78 and the plug came back a bit on the light side. The next one I had was 80 and it seems a nice color after a plug chop, but it feels very boggy and I lost top speed in every gear. Should I take out the wadding in the air box? It felt way better a with the 78, but the color worried me. Any thoughts?

Thanks.
OP
UTC

Enthusiast
Joined: UTC
Posts: 59
 
Enthusiast
Joined: UTC
Posts: 59
UTC quote
No ideas? Rode it to work this morning and it feels boggy through 1st, runs well through second and then seems to lose power in 3rd. 4th is as it has always been. Sounds good though...
@matty5 avatar
UTC

Hooked
Joined: UTC
Posts: 439
Location: twincities
 
Hooked
@matty5 avatar
Joined: UTC
Posts: 439
Location: twincities
UTC quote
"Usually" you don't need to go up more than 4 points, I'd say 2, with the Polini so the 78 should be in the ballpark but every scoot is different.
OP
UTC

Enthusiast
Joined: UTC
Posts: 59
 
Enthusiast
Joined: UTC
Posts: 59
UTC quote
Maybe I didn't run it long enough when I did the plug chop with the 78 jet in. The plug looked light though, not white, but not creamed coffee either. It seemed to run great though. Like they all do right before they seize...

I will step it back down tonight and see how it looks.

Thanks
@sfvsr avatar
UTC

Ossessionato
a lambretta or two
Joined: UTC
Posts: 3724
Location: San Francisco
 
Ossessionato
@sfvsr avatar
a lambretta or two
Joined: UTC
Posts: 3724
Location: San Francisco
UTC quote
Yeah, go ahead and pull the air filter/box. Or drill a bunch of holes in it. Or just take out the mesh that is in it.
DoubleGood Design banner

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com


All Content Copyright 2005-2024 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0226s ][ Queries: 3 (0.0040s) ][ Debug on ][ 313 ][ Thing One ]