Originally Posted by The Letter J
I recall several threads over on thumpertalk discussing (with part #'s) how to install factory yamaha wide ratio (just 3-5 or 1-5 if you care to do some grinding inside your yz cases) gears from a WR model. It's sleepy time for me but a search over there is sure to give the answers... http://www.thumpertalk.com/topic/457...0-3-4-5-wr4xx/
It seems to me that it would be possible to keep 1-3 the stock close ratio and convert 4-5 into the wider ratio. Gives you the best of both worlds.