Originally Posted by 2fst2c

Mark, I measured it on the end of the pin with the tips of the caliper because the wide part of the caliper is wider than the wear spot. It is worn the amounts shown. You can physically feel it and see it. For break in, I heated the engine to 215. Temp taken at the base of the head. Figured internal temp was around 200. Turned over nice on the box. Ran it at a good idle for 1 tank while keeping the head temp 215-220. Let it cool 30 mins. Heated the motor back up to 215 and fired it up. Leaned it enough to keep it running while doing ovals in the parking lot and keeping the head temp 200-220. Had HD tinfoil on the head. Did this for 4 more tanks cooling down 30 mins between tanks. Tank 6-12, heated as above and removed tinfoil. Leaned out each tank and widened the rpm range and kept engine 215-220 through entire tank and again cooled down between tanks. Tank 13-till broken, heated engine, began tuning on the track. Was about 90% tuned when it stopped. That was just under a gallon. The clip in the 1st piston actually broke. Part of it is still in the groove. The 2nd piston has no clip left. That is the one that had the worn pin and I also believe the pin wear caused the clip to pop. I need to get your addy because I wanted send these into you to look at anyways. Thanks