Fit, not sure if its necessary but is good peace of mind. 03CRF450R
Fastway Counter Shaft Spacer
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This item is a spacer. But my countershaft bolt kept coming loose. It is the second one that I have bought and had the same issue with both. Worked better on my 05 Yamaha YZ than on my 07 CFR450R. The 05 YZ had a large nut V.S. the small bolt on my CRF. The first time it came loose I thought thought that maybe I forgot to torque the bolt down, so I cranked it down hard, still came loose.
Used this spacer with a Primary Drive xring and luckily I checked it out and the master link was just grazing behind the front sprocket. Just took a file to it and not rubbing now. Spacer did its job on my 09 CRF450r
Easy install and works great.
Used it for my Honda 450r 2011