72 Harley-Davidson XLCH 1000-Sportster discussion forum:

RE: What is the maximum a 72 xlch can be bored?

RE: What is the maximum a 72 xlch can be bored?

Dr E said 2004-11-04 23:44

I am not 100% sure of this, but I was told that 60 over was the max before you compromise the integrity of the walls. I have a 72 xlch that is bored out 20 over (domed pistons) and that increased the horsepower almost 200 cc´s.

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