I am gearing up to finally do the top end rebuild on my 87 TRX 250 Fourtrax to get it to stop blowin’ smoke. As I was looking up kits on the great and mighty eBay, I noticed that one of the few complete kits with piston, rings, gaskets, etc… said it was for the ATC 250es, 85-87 TRX 250, and, drumroll please, the 88-00 TRX300/fw!
Now my question is, are these kits really compatible? I KNOW the bore is 74 mm on each engine, so will the piston from a 300 work in a 250, like this kit implies? I know there is more that goes into the pistons than just bore diameter. If the pistons are the same, are the gaskets the same as well?
Note: I did do a search and didn’t find what I was looking for.
If so, I would much rather buy a Wiseco piston and Cometic gasket kit for a standard bore 300 rather than the crap I have found for the 250 (there is very little to choose from for the 250 fourtrax)
