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Message: [QUOTE="2strokerfun, post: 1382312, member: 69719"] Lot of different opinions on breaking in an engine. But, as foxforks says, heat cycle method is arguably the most agreed on method (ya know, you can get away saying most anything by using the word "arguably" !!). Me, myself and I do this by running engine for about 5 minutes idle and low throttle repeatedly, not in gear. Let cool completely. Start it and run it again for 5-10 minutes idle and giving it throttle up to about 1/3 or so and back to idle repeatedly, still not in gear. Let it cool completely. Start it, ride it around slowly up to about 1/2 throttle for another 5-10 minutes. Let cool completely. Recheck torque on head and cylinder bolts (OK, honestly, I've skipped that a few times, but you really should). Then go ride it as you intend to ride. I always change the transmission oil after the first 20 minutes or so of actual riding after rebuilding an engine. [/QUOTE]