Originally Posted by cdelong

Mike/Ron/Mike,

I tried your "Swauger" bench break in method today on my new MR21-R01A Ninja's The first one ran kinda cool at 1/2 and WOT (~100F). Idle and 1/4 runs were 180- 190F. After breaking in that one I opened it up to check it out..... the wear pattern on the piston and sleeve is very odd.

It does not have a coencentric wear ring on the sleeve or the piston. Usually I see an even wear "glaze" in the sleeve near TDC. This one has eight evenly spaced "glazed" areas that line up with the piston and sleeve perfectly. Any ideas?

They are not scores, scuffs, or scratches- just an uneven "glaze pattern" as I call it. The glaze marks are on the piston as well- it's smooth with a fingernail touch- same as the sleeve. Do you think it just needs more time to even out the pattern? It has loosened up pretty good, but needs some track break in still.

The second one I tried to keep a little warmer all the way through the runs and it looks perfect and still sticks pretty good