2002 400EX...Any suggestions for changeing the front to rear sprocket ratio. (adding/subtracting teeth) on either the front or rear (or both) sprocket. Would like to get a little more low end zip and increase the rolling stall rate for those hard technical areas on the trails.

Peace
Willfulone

 

The easiest/cheapest way to go would be to put a 14 on the front.

This may help too: Gear ratio calculator

 

Lots of guys put on a 14 tooth sprocket up front. It gives you alot more grunt. Now I'm thinking I'd like to drop the rear to a 36 tooth sprocket, and gain a little of the top end back. 14 teeth is almost too low once you start doing mods to your motor.

 

BTW, what is the stock gearing?

 

You're right Dude. When I did the cam/piston thing to mine I went back to the 15 front.

 

15/38

 

moto93,

Muchos gracias! I was wondering because I was thinking about a bigger rear sprocket for it to compensate for the larger diameter tires (Maxxis Razr 2s). Looks like I may have to go up a couple of teeth. I'd realy like to stay away from going to a smaller front sprocket because of the chain guard on the swingarm. 3-4 teeth on the rear should do it.

 

The main thing I noticed when I went to a 14 tooth front is the rev's between the gears shortened up quite a bit. It's not actually more power, but you get to the higher rev's quicker with the smaller front and on trails where you will be in 2nd gear on a 15 tooth, you can be in 3rd gear on a 14 tooth. Takes a little off the top end, but I'm not a dune rider so the loss wasn't even noticed. The front wheels pop off the ground more, which can be cool for doing wheelies out of a powerslide, but can be bad when you lose steering and hit a tree!
Either way you slice it, it's a cheap and easy way to tweak you bike to your riding style.