This winter I took my lump over to Herb’s Garage. Herb Becker that is, engine builder of the bike that won first place in the 2003 AHRMA’s Formula 750 races in Daytona.
I managed to talk Herb into a full rebuild on my engine. I was concerned about the off-idle knock, the general leakiness, and occasional smokiness of the engine. Perhaps he felt somewhat responsible for the bike as I bought it from him as a rolling basket!
Good news was the pistons and barrels were in great shape, they are already .020 over from some previous owner. It needed a crank grind and I had the dubious distinction of having the worst crank wear that Herb has seen. it was an even 30 thou down from what is normally a thou. The wear was even, not oval (?!). The shells were worn down to copper, barely a trace of Babbitt left on them.
I joked and said “I guess I shouldn’t have been taking it up to 6500!” Herb’s response was “You shouldn’t have been riding it!”