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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 have an 08 with full intake, HMF Optimizer, and an HMF slip on. I do a lot of wide open trail riding mixed with tight in the woods trail riding. Looking to see what the best set up is for the most speed all around. I want to keep up in tight trails and keep up/lead on straight aways...
  3. Engine/EFI/Drivetrain
    hey guys i was looking at some stuff and i came across this gearing breakdown. i know if you looked hard enough, you could find it... but here you go! “What is gearing down?” “Do I need a larger or smaller front sprocket for more top speed?” “What effects will my ATV have if I switch to...
1-3 of 3 Results