What gearing is best for a nearly stock 400ex?

[RIDER11X]

How high of gearing is practical on a nearly stock 400ex? What is everyone else running. Looking for more top end without dogging on the clutch too much. Maybe 15/36 instead of 15/38 w/ 20" tires?

[trailburner]

I would do the 15/36 before i would go up one on the front, with a stock bike it should work fine for a little more top end...

[hawiianpwr]

going to a 36 from a 38 isnt going to give you more top end. Its going to help on acceleration but you'll lose probably a couple of miles an hour topped out.

[hawiianpwr]

sorry I read it wrong your right.

[RIDER11X]

Does anyone have this, or rode a 400 with this set up.::huh :cool:

[crashinmatt]

i was runnin 15/37 on mine last year, but now that i have more power, im runnin 16/36. but that is with 18" tires. i was ruinnin the 15/37 with 20" tires and just a slip-on at first. i liked it.

[Chanman420q]

What i plan on doing is getting a 440 kit, 16/36 gearing and 18'' holeshot tires. I think that should be a good set up for when i do MX, but when i hit the trails im goin to a 20'' holeshot and 14/36 gearing.

[SmokinJoe@PJR]

The only change I made for harescrambles is a 14 front.Now that I put one of my airboxes on I need to go back to 15. I dont think a 16 front will fit on a 400. There isnt the room to the cases

[crashinmatt]

just my .02 the 16 tooth will fit on the front. it is tight, but i took a grinder to my case saver just to be sure it will clear at all times.

[RIDER11X]

swapped back from 14/38 to 15/38 with 20" rears. Wow! I thought originally that those were too high, but stock gearing is actually much better. My stock 400 got beat by a modded 300ex when i ran the 14/38. With the 15/38 I smoked the same 300ex very badly from 2nd gear on up! I'll reserve the 14t for use with 22" rear tires only. Now i need to try a 37 or 36t rear.:)

[Wingnut]

Where can I get a 36 tooth sprocket? I can't find anyone that lists them for sale.

[RIDER11X]

Originally posted by Wingnut
Where can I get a 36 tooth sprocket? I can't find anyone that lists them for sale.
Nac's Racing sells them down to a 33t I believe.

[Chanman420q]

Originally posted by RIDER11X
Nac's Racing sells them down to a 33t I believe.

wow i think that u would only need it if you had a 440 kit or ur front sprocket was like 11t

[honda400exrider]

does the rear sprocket increase or decrease acceleration as the number of teeth go down?

[Chanman420q]

Originally posted by RIDER11X
How high of gearing is practical on a nearly stock 400ex? What is everyone else running. Looking for more top end without dogging on the clutch too much. Maybe 15/36 instead of 15/38 w/ 20" tires?

STOCK 400EX DO GOOD WITH STOCK GEARING!

[honda400exrider]

yup i had 14 tooth front for a while, and i switched back to 15 and am more pleased with it. the 14 topped out tooo quick...

[RIDER11X]

Originally posted by Chanman420q
wow i think that u would only need it if you had a 440 kit or ur front sprocket was like 11t

33T sprocket and similar sizes are needed where you set up requires 18" tires+ lots of top speed such as mx with long fast runs.

[RIDER11X]

Originally posted by honda400exrider
does the rear sprocket increase or decrease acceleration as the number of teeth go down?

Decrease, unless other changes are made such as rear tire size.