[ap3x]

I'm going to build my thumpstar 125 with a 146 hc with a big valve head but I'm keeping my 22mm carb and I'm wondering if I should order larger jets now or if I should wait to see if it needs it? Thanks

 

[zwieblekopf]

it will need it

 

[yellow bandit]

It might not need to be rejeted. just because you put a bigger piston in it doesnt mean you need a bigger main jet. most of the time elavation and temp have more of a effect on jetting than piston size.

 

[Trick Daddy]

Hey Joey, shoot me a pm on the northwoodsgp forum, as I have a handful of jets for your stock carb...up to 105 main....