Foreman rebuild

[Jak400ex]

Anyone know how big of a bore i can go w/o having to run race fuel? I saw on bike bandit .25 to 1mm over and i'm wondering how big i can go and if it's even worth it. I need to replace my piston and rings and decided i might go for extra power too. As you know the foreman runs like a turd, top speed 45 due to it's gearing, just wondering.
Thanks

[Jak400ex]

03 foreman 450es

[4TraxRider]

You can bore the cylinder as far as possible and still run pump gas. The compression ratio is what will have an affect on the octane needed not to pre detonate while running. Check out companies like high lifter and FST. I think they sell some performance products for the Honda Utes.

[Jak400ex]

thanks, what changes compression?

[Kickstarts-suck]

Originally posted by Jak400ex
thanks, what changes compression?

higher compression pistons