Sprocket Sizes

[goral400]

What is the stock sprocket count on a 06 400ex?

Also, what is a popular size to buy and where do you buy them?

[krt400ex]

The stock sprocket on the 400EX is a 38 on the rear and a 15 up front. If you have an aftermarket pipe go up 1 tooth on the front and enjoy a little more top speed.

[miller821]

Originally posted by krt400ex
The stock sprocket on the 400EX is a 38 on the rear and a 15 up front. If you have an aftermarket pipe go up 1 tooth on the front and enjoy a little more top speed.
Wrong.... The rear is right I think, but the 05' and 06' have a 14 tooth front sprocket...

[NCexRider]

Stock front sprocket on the new models is a 14. Most people actually prefer to go down 1 in the front for more low end power rather than going up one and losing pull just to gain a couple of miles per hour. How often do you run 5th wide open and for how long anyway?

[miller821]

Originally posted by NCexRider
Stock front sprocket on the new models is a 14. Most people actually prefer to go down 1 in the front for more low end power rather than going up one and losing pull just to gain a couple of miles per hour. How often do you run 5th wide open and for how long anyway?
Yea thats why I got a 14 tooth sprocket on mine... I run trails and i'm in 3rd, 4th at the most.

[goral400]

So where do i buy a 13 tooth front sprocket? :)

[LaLaLoosh]

the newer models are a stock 14 sprocket. try www.sprocketspecialist.com

[goral400]

What kind of experience do you guys have with larger rear sprockets. OEM is 39... How would it, or how is it with a 42 tooth sprocket?
Thinking bout putting a 13T primary and 42T secondary with rear tire size Razr2 22.11.9

[goral400]

Has anyone tried this??

[stic]

What kind of experience do you guys have with larger rear sprockets. OEM is 39... How would it, or how is it with a 42 tooth sprocket?

they say 1 in the front is equivilant to 3 in the rear.fronts are much less expensive.which is prob the main reason ppl swap the fronts out.i have a 14 in mine(down 1 from stock)and i like it.id like to go one more but they say(they being the quad mechanics)you can wear your chain down faster that way.so i think ill opt for a 39 rear which is 1 up from stock on my 03.
with the 13/42, given the tire size you stated,youd prob be 1 up from stock.i think.....

[buster024]

I've got an 05 400, and I couldn't believe the difference when I dropped a tooth on the front sprocket. It felt like a different bike. Plus it takes about 30 seconds to do.

[goral400]

What brand sprockets should I buy? And where?

[MillerTime4187]

Originally posted by goral400
What brand sprockets should I buy? And where?
I've heard a lot of good things about sidewinder but they are pretty expensive.

[NCexRider]

Originally posted by goral400
What brand sprockets should I buy? And where?

Renthal and JT both make 13T fronts for the 05/06 EX. Rockymountainatv.com has the Renthal and motosport.com has both. If you decide to go up in the rear you need to factor in clearance if you run a swingarm skidplate.

[goral400]

I can't seem to find a place that sells sidewinder other than their website which is really impossible to use. They don't have pictures, prices, or any info on anything they sell.