I just had my motor built by a fairly known builder in my area. He is not a major shop but he is the one to turn to around here. Here is what I have: full drag port, 4mil crank, trued and welded, dual pingle, 34mm pjs with 140 mains, 112 vp fuel @ 40:1, wicked intakes, bored 50 over, timming plate +4, lock up with r6 clutches, cool head with 20cc domes at 140lbs compression, cpi out of frames, brand new wcr trans and tons of other sht that dont matter right now. I ran 1 1\2 tanks of fuel just around my house in about a 2 week time frame and motor pulled hard but cut out bad on top end and would foul plugs like crazy. Brought the bike back to him and he found he had 180 mains in the carbs, so he replaced them with 140's and the bike ran great and the plugs were a cardboard color. Went to the dunes last Sat. and motor locked up after two drag races (third tank of gas). The motor was at an idle when it happend, thank God. Pulled motor down and found the intake piston skirt on the right cyl broke and wedged between the crank and the case. I am not edging to talk sht on this guy, just want to know what happened because he cant tell me and now a few thousand dollars later and 3 tanks of gas I am looking to caugh up another 3-4 hundred dollars again. Thanks for any replies