"Why destroy two perfectly functioning motorcycles to perform this experiment?"
Oops, I must not have read that bit!
I stumbled onto a 510 that had been in a gasoline fire during a
Baja 1000 race. And, by a stroke of good fortune, the owner was willing to trade it for a CR500 engine. So, I bought
Cycle World’s 1988 CR500R test bike, made the swap, and started what would eventually consume two months of my time and involve about 500 hours of labor.
There was one final—and very compelling—justification for this project: After a recent binge of tool-buying, I had a new metal lathe, a vertical mill, a MIG welder and a metal bandsaw, all just waiting to be broken in...….. I would think tig welder more suitable for this type of project, one can really see what is going on.