I have a 03 CR250 and went with the 11o/z
It turned my motocross bike into a formidable woods weapon without robbing horsepower.
Super easy to install NO SPACER NEEDED !
Instructions are well written
Top quality part
I would recommend this to anyone with a two stroke ping trail ridding.
This weight was a pefect fit on my 03 CR250r. It locks in with the grooves on the flywheel so it won't spin. I recommend it highly and the other nice thing is you don't have to modify the cover or use a spacer.