I have a 100% stock trx 450r and i would like to put a set of fast sprockets on it. Could you please tell me what the stock tooth numbers of the 450r sprockets are and could you please tell me the best combination of front and rear tooth sprocket to make it as fast as possible....well so it doesnt hurt it. Thanks doug

 

i beleive stock is 14/38. but i'm still running that gearing so i don't know what u want. u could put a 15 tooth front sprocket on, and like a 32 tooth rear, but ur gonna lose all ur acceleration, although ur top speed would easily break the 90's. i'd say keep the stock gearing, but get an X-ring or non O-ring chain, and lighter sprockets, plus a lighter axle, this will make it easier to spin everything allowing you to have more horsepower at the rear wheels, instead of some being lost through the drive train.

 

Yep

 

I have a 36 tooth rear sprocket and it brought me up to 85 mph.(checked with a bushnell radar gun multiple times).First gear is a little taller but I love this setup for high speed trail riding.The rear is the same as 400 ex,the front is same as crf450.