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Message: <blockquote data-quote="user 92" data-source="post: 31571" data-attributes="member: 92">I've never used knurled pistons. I do remember hearing about it years ago, but for some reason just always ended up with new pistons. Maybe because 90% of the time I went oversize anyhow. Looks like a worthwhile alternative for obsolete parts. I have knurled valve guides, but found that new guides lasted longer. But guides are different than pistons.Another alternative for obsolete parts, if you were forced to do some research, we have a burned up Honda car motor sitting in the shop right now and I noticed the cylinder bore seems to be nearly the same size as the 1100 bore. If the dementions of the pistons were the same, like wrist pin location, etc. the motor wouldn't care if it was a car piston. Even if you had to shave off a bit from the skirt length to make it fit. Just make sure it will have the needed valve clearance and stuff like that. There's a better chance that pistons are still available for the car motor.</blockquote>