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Message: [QUOTE="griffbones, post: 1187911, member: 72285"] 2007 KX100 engine, pipe, electrics and carb in a 2005 KX85 bike. 13/50 gearing with the short wheels of the KX85, needless to say it is geared pretty deep. We ride tight woods and my son is NOT very agressive thus the deep gears and a flywheel weight. Last week I mixed up a fresh batch of 91 octane pump fuel mixed with Amsoil Dominator at 40:1. We ride for about an hour or so then head down a pretty long straight away. My son always rolls the throttle and then backs off and the rolls on then backs off on real long straights becuase I have told him not to leave it pinned on a real long (1/8 - 1/4 mile) straight. Well all at once the bike dies on him, but restarts but doesn't want to idle. We get home and the bike starts right up and idles fine. A compression test reveals 165-170 PSI! But the top end sounds noisey, so I pull it apart and find this: [IMG]http://www.walkerharleydavidson.com/bike/stock1.jpg[/IMG] [IMG]http://www.walkerharleydavidson.com/bike/stock2.jpg[/IMG] Now this bike is jetted 100% stock, so I would have thought that it would have been a little rich. What few times he has ridden the bike the plug porcelin always looked tan with a bronze color to the base of the threads and on the electrodes. The bike still seemed to run very strong and as stated had 165+ for compression but the top end had a rattle, so that is why I tore it down and found this problem. Yesterday per the service manual, I smoothed up the cylinder with 440 grit wet dry sand paper, and then cleaned the cylinder with brake cleaner, then soapy water, then rinsed and then dried it off with compressed air. I then installed a new Wiseco piston and top bearing. Started her up and she sounded great. I let it cool down completely, then repeated this warm up/ cool down cycle, and then took it for an easy five minute ride. Then I let it cool down again and then started another easy ride but only made it about 10 minutes top, and then she seized up again. This was with no hard, only moderate throttle action. This time here is what I found, and the inside of the cylinder looked like it was full of gray lapping compound, unlike the first tear down which looked clean. [IMG]http://www.walkerharleydavidson.com/bike/wiseco1.jpg[/IMG] [IMG]http://www.walkerharleydavidson.com/bike/wiseco2.jpg[/IMG] And here is what the plug looked like at each tear down, dark gray and almost powder coated, instead of the nice tan color that I had been accustomed to. [IMG]http://www.walkerharleydavidson.com/bike/plug.jpg[/IMG] What the heck is causing this? And sorry for the long winded post, just trying to accurately describe the events. BTW this engine probably only had about 8 hours on it before the first failure. No jetting was changed so I don't think it should have been lean. And as I stated this was fresh gas with synthetic oil at 40:1. Thanks a bunch guys, Griffbones [/QUOTE]

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