Modern Vespa

Guys can you look at these photos of my plug after I up jetted from a 118 to a 120 main jet and done a couple chop stop tests.... It looks a little lean to me, should I try a 122 or does it look good? I uped the jets because I put a sito plus on and drilled my air filter on my p200.... That improved my speed from 56 mph top to 64 mph top.....
Thanks in advance guys..... Scott

You'll need to cut the threads off the plug if you want to see how your main jet is performing. It's the size and color of the ring around the base of the insulator (or lack thereof) - not the tip - that tells you whether the main is rich or lean.

There needs to be a Wiki on this.

http://www.kawtriple.com/mraxl/carb/plugchop.htm


looks a bit ashy

you can try this:
- pull choke out @ WOT

if the engine likes the extra fuel = up the main jet
repeat until pulling choke 4 strokes
up the main until it 4 strokes
back off main jet one size

ride