Main jet change

[jellerby]

Hello,

I just bought a SIP Road 2 exhaust along with two main jets, 118 and 120. It will be ran on a P2 all original and stock. My question is, is it hard to change the main jets? I've never done any engine work on my Vespa. Do I have to remove the whole carb to get to it? Unscrew or pull out? Any steps on how to change it is appreciated. Also, how do I know I'm running the correct size main jet? Plug colour?

thanks a lot 

[djloone]

Not a hard job fella..just need too unscrew the 2 screws holding the carb top on

LOON-E

[henri]

under the air filter ,2 brass screws ,larger 1 is the jet stack ,main jet is a push fit in the end .10 minute job . H