Break in period

[RedRider2k2]

Originally Posted by was92v

Do you guys think there is a difference between a new engine /gearbox and rebuilding an engine that all the other hundreds of parts are already run in?
There are hundreds of friction points in a new engine/gearbox that are lapping in besides the cylinder walls, piston skirts and rings in a new motorcycle engine/gearbox that are not at all a concern when rebuilding a used unit.

No, not really. All those friction points you speak of are either replaced with new or measured to make sure they're within Spec. You dont toss on a new set of rings and call it "Rebuilt". I'm talking front to back, top to bottom, EVERYTHING gets stripped down and gone over with a micrometer.