14 tooth front sprocket

[Honda TRX250ex]

I am planing to get a 14 tooth front sprocket when i get my quad back together. I have 20 inch tires in the back and a 36 rear sprocket. How much do I have to grind off the case saver to make it fit? Will my top speed go up or down?

[guinness77]

If the stock front sproket was a 15 tooth, then you won't have to grind anything off the case saver. If you went with a 16 things would be different. Basically, going with a smaller front sproket means you don't have to do anything to the case saver.

I've used a smaller front sprocket on my 400ex a few times too. The top speed will drop about 5 mph (At least, that's what it felt like.) But the torque sure went up.

If you were running a stock set up which (I think) is 15/38 then your rear sprocket of 36 was giving you more top end speed and reducing torque. A 1 tooth change on the front sproket is equivalent to about a 3 tooth change on the rear.

[440_Turtle]

Im actually running that same gearing right now, I came down from a 16/36 and o my what a difference. My bike used to have crazy top end speed but it was liek a rocket once it kicked in. Well anyway switching to teh 14 definateley took alot of that away and made it more of a trail friendly bike. I have been told that the 14/36 is slightly higher than stock 15/39 gearing. im considering putting the 39 on and trying out the 14/39 and see how that works out.

[underpowered]

Originally posted by 440_Turtle
[B]. I have been told that the 14/36 is slightly higher than stock 15/39 gearing. B]

stock is 15/38, not 15/39. ANd it is actually slightly lower than stock gearing. you will lose a little top end, but not mcuh.

[jason43050]

what is the 2005 400 ex gearing? front/back

[underpowered]

Originally posted by jason43050
was is the 2005 400 ex gearing? front/back
14/38

[jason43050]

Originally posted by underpowered
14/38 thanks, man my spelling sucks today lol.:macho

[Honda TRX250ex]

I have a 250x not a 400ex. I had on it 13/39. and now i have a 13/36 with 20s.
I would like more top speed so would a larger front sprocket be bad or good for more top speed.

[bwamos]

The origional poster is a 250x rider.

The stock gearing on a 250x is 13/38 w/ 22" tires.
23.6" of forward movement per couuntershaft rotation.

14/36 on 20" tires will give you:
24.4" of forward movement per countershaft rotation.

Geared slightly higher than stock.

14/38 would probably be more suited for trails. (23'1" forward)


Right now, w/ 13:36 on 20's you are getting about:
22.7" of forward movement per countershaft rotation.

Switching to the 14/36 should increase your top speed by about 7.5%. Boosting you from (assuming 55mph stock) about 53mph up to 57mph

Obviously calc's are assuming a perfect 20" or 22" tire diameter (which is never the case). But, the ratio should still be comparable.

[underpowered]

sorry, i am just used to the 400ex forum.

[Honda TRX250ex]

Originally posted by bwamos
The origional poster is a 250x rider.

The stock gearing on a 250x is 13/38 w/ 22" tires.
23.6" of forward movement per couuntershaft rotation.

14/36 on 20" tires will give you:
24.4" of forward movement per countershaft rotation.

Geared slightly higher than stock.

14/38 would probably be more suited for trails. (23'1" forward)


Right now, w/ 13:36 on 20's you are getting about:
22.7" of forward movement per countershaft rotation.

Switching to the 14/36 should increase your top speed by about 7.5%. Boosting you from (assuming 55mph stock) about 53mph up to 57mph

Obviously calc's are assuming a perfect 20" or 22" tire diameter (which is never the case). But, the ratio should still be comparable.
Thanks man.