I have an 04' WR450 and have destroyed the piston, head and connecting rod. Almost impossible to find a second hand replacement engine or second hand parts locally. I have access to an 04' YZ450 with a smashed crankcase which I can pick up very cheap. Will the YZ head and piston etc. fit to the WR ? I've been told it would but am scepticle. I've only recently had the gear box rebuilt on the WR which cost a fortune. I would like to use the 5 speed WR gear box if possible.