Also worked on the chain and drive today. Since the CBR is much wider than dirt bikes, the counter shaft sprocket is way too (3/4"??) far left. Being the swingarm needs to be centered, the only options are to move the countershaft sprocket in, or move the rear sprocket outboard. I am going to do both.
I chucked up the new counter sprocket I bought for a 520 conversion. It has a shoulder on both sides to space it off the motor and to accept a bolt. I machined off one of the shoulders and remounted it. I gained maybe 3/16". Which is just that much less I need to space out the rear sprocket. BTW, that bastard must be really hard steel. Even with a rock solid tool holder and carbide insert it was a struggle to take just that little bit. I guess that's good for durability though.
I don't have my rear wheel yet I'll see what options I am looking at once I secure one. Have some different options but def leaning towards the cush drive from a 625/640/525 in either stock or aftermarket flavors.
We're not out here to rough it. We're here to smooth it. Things are rough enough in town.