gearing on 85 200x with 18's?

[110 atc]

My 200X is still coming together and will be running 18" klaws on the back.I will be running a 10.25 compression piston and XL cam and want to avoid buying 3 - 4 different sprocket sets as I will always use 18" rubber. Will a 14 tooth fit behind the sprocket cover if I went that big? I figured with all the 200X racing coming up some one would know of a good combo.

[shortline10]

Yes a 14 will fit but with no sprocket cover , I always used 13 x 38 with 18" rears .

[christph]

I run 13 x 34 on 18" tires. It's a good combination for mx, offering strong acceleration and a healthy top end. It also depends on your engine build, i.e., a highly modded engine vs. stock. My build sounds similar to yours: 10.25:1 piston, Keihin 27mm carb, K&N filter, XR intake manifold, and Supertrapp exhaust. Eventually I want to get one of Mickey Dunlop's engine kits. Here's a picture.

241549

[110 atc]

Thanks guys, it looks like I sound order up a 13 tooth for sure. I don't want to short myself when I cut my chain. That is a trick looking 200X christph.