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
There have been no questions asked about the Fastway Counter Shaft Spacer.