Sprockets... Reminds me of Mike Myers and Sat.Nite.Live...hehe Anyways. The stock teeth on a 400EX is 15/38. I always forget this so after i get a post i am printing this and stamping it to my forehead... Which way do you go on each sprocket for a higher top-end/higher botton-end and visa-versa...

 

Larger front sprocket=more top end and smaller rear sprocket=more top end. Therefore, smaller front sprocket and larger rear sprocket=more bottom end power. Keep in mind that the increase in top end is at the expense of a decrease in low end power and vice versa.

 

Thanks... What ratio does everyone run?? Tell me your bike...

 

16 TOOTH FOR DRAG RACING BUT YOU GOT TO REMOVE THE CASE GUARD AND HOPE YOU DONT LOOSE A CHAIN AND THE STOCK 15 FOR TRAIL RIDING.I LEAVE THE REAR ALONE ITS TO MUCH TO CHANGE AND NO CLEARANCE WITH A LARGER ONE DUE TO AC SKID PLATE.

RIDE LONG
RIDE HARD
W.F.O.

 

I found the stock sprockets to be too high for my use, so I dropped one tooth on the counter shaft sprocket to a 14 tooth sprocket, which works ideal 99% of the time. We have an OHV park with a real tight 2 mile trail, for that I add a 39 tooth rear sprocket and can stay in 2nd gear throughout the trail and loose anyone following me at the same time.