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  1. Engine/EFI/Drivetrain
    Hey everyone, I recently purchased a 2009 KFX450R, and it has a low top speed. By low I mean 88km/h (55mph). My gearing is stock (14/38), and I have 20” rear tires. Just did a fresh oil change, and it has an FMF PowerCore4 full exhaust with header and a K&N air filter.
  2. General Discussion
    I recently goot some new rear tires, there holeshots 18x10-9, there shorter tires and i realized i lost some top end. I have a few mods on my kfx but performance wise i just have a k&n air filter. i used to be able to go 66mph and keep up with the cars on the thruway now i cant even keep up with...
  3. General Discussion
    I installed my fci and procom last night and told my friend about it. He's the type that has to have the fastest everything. Truck, fourwheeler, bike... doesn't matter. So now he's saying that i wasted $500 on parts because he says he can outrun me on his 08 TRX 400. All it has on it is a Curtis...
1-3 of 3 Results