I should have been more clear. Trying to piece together a motor as the one that came in my 88 R2J has issues. The crank, clutch and one head are scrap. The barrels and crankcases are not great being full of rust from the rusted out coolant feed pipe. I have been looking at a couple of dry clutch engines which I guess are 6k. Am I correct that there is no interchangeability between the r2j and 6k cranks? Are any of the component parts interchangeable such as flywheel, crank pins, webs, rods etc. Are the seals and bearings the same? I am hoping to get pieces together to come up with at least one fully re-built crank.