My dad and I own a bike shop we work on mostly Harleys I do most of the Quads and dirtbikes, but we don't get many. In the shop we have CNC machines and every accurate measuring tool you need. My dad is known for building bottom-ends trued within 0.001 He has trued several of my dirtbike cranks. He could do almost any crank.

I'm going to check the part #'s on those cranks I can rebuild his but it would be easier to just drop a used one in.

 

I have a 96 Warrior that i had to put in a new crank. Yamaha wants an arm and a leg for theirs. I would be careful about buying a used one because it is no easy task replacing a crank. I know in the back of Dirt Rider magazine has an ad for cranks. I found that out after buying one from yamaha.