gear ratio help

[2006 400ex slsd]

hi my 400ex does not have good bottom end but good top end my gear ratio is 14/39 if i do 13/39 will it help my bottom end a good amount and not totaly be a terd in top end please just let me know thanks....

[JOHNDOE83]

14/39 should have good low end?

you can try 13/39 or 12/39, what size are your tires?

[2006 400ex slsd]

im running 20in tires its alright but when i punch it it just doesnt have enough power

[jcs003]

sounds more like a throttle response issue. a hi-flo air filter and exhaust will help with that.

the bad thing about putting a small sproket on the front is it wheres your chain out verry fast. do yall agree?

a good pipe like hmf and a stage one hot cam will give you the bottom end you need with a 14/39 what ever you stay 14 on the front and go 39 or bigger on the back.

[jcs003]

Originally posted by jcs003
sounds more like a throttle response issue. a hi-flo air filter and exhaust will help with that.

i agree. its also more likely to come off with a smaller front sprocket.

[JOHNDOE83]

Maybe? the clutch is slipping?

[2006 400ex slsd]

no its not the clutch and i got a k@n and stage 2 cdi box

[JOHNDOE83]

Does it rev up, but feel like theres no power?

[2006 400ex slsd]

no just takes a while to pick up speed

[4reeds]

Drop a tooth infront.You'll be much happier.If you do any trail riding or tight track racing,hill climbing this will help alot.I've had the same chain for 3 yrs on mine.Never had an issue.

[2006 400ex slsd]

ok cool thanks:D

how much did you pay for your chain? and how much do you ride? that is what counts as far as having a chain for 3 years.

[4reeds]

Chain was about $60,primary drive chain,8510 tensile strength.Sprockets are also primary drive.Just now replacing the rear sprocket from the teeth folding over.Ride every other weekend.Ride dunes,trails and the occasional track.

[jcs003]

i was thinking. maybe it is your clutch. i havent had my 400ex in quite a whike but i remember it had get up and go even when it was stock. you may want to take a closer look at the earlier suggestion.

i know wheelieing alot wears out clutches and rear brake pads...

[2006 400ex slsd]

its got a brand new clutch in it only 3 months old and only 15 hours on it so not my clutch its not sliping just kinda boging out 1st part of 1st gear:confused: