CRF450 Sprocket Combos

Stock is almost the same as what you have as far as a raitio. 3.69 stock and your at 3..71. I don't think anyone but a pro would feel the difference if any from what you have to stock. What is your rear sprocket like? Maby you can just replace you front sprocket if you want to feel what a gear change will do. Buy a 13T for the front. That would make it a ratio of 4.00 though. Way to slow depending what kind of conditions you ride. I would not want a 4.0 except for the tightest single track. If you want to go slower then put more teeth on the back. If you want to go faster put less teeth on the back.

Stock is 13/48.

I just put 13/49 and like it better but then again I have a Yoshimura pipe which gives 1/3 more additional overev.
So by adding the 49 i lost some overev and gain a lot of thrust out of corners , but the overev I lost probably now leaves me with roughly the stock overev feel.
I added an ignition box to get some of the overev back and it worked.
Also, when I went up 1 tooth in rear I had a weird pinging/rattling noise coming from the front of the engine. It turned out to be the chain was rubbing the mud guard and slapping the rear swing arm. I adjusted the chain and the noise went away.


I think if you put a 49 on and you have a stock pipe you might feel that you lost a lot of overev and will have to shift way too much. From my personal thoughts, I would leave the gearing as is if you have the stock pipe. One tooth change on the four stroke is way more noticable in comparison to changing one tooth on a two stroke engine. (unless you ride tight tracks all the time)

Spokes574