mike0chek Posted September 20, 2011 Report Share Posted September 20, 2011 hey guys, just pulled the jugs off my banshee to see that that pistons were beat and chewed pretty bad on the top, the bottoms were even missing a significant amount lol can anuone tell me what the cause of this would be?? ive seen small pieces broke off before but this looks pretty bad lol also the cylinders look great. Quote Link to comment Share on other sites More sharing options...
coryv4 Posted September 20, 2011 Report Share Posted September 20, 2011 hey guys, just pulled the jugs off my banshee to see that that pistons were beat and chewed pretty bad on the top, the bottoms were even missing a significant amount lol can anuone tell me what the cause of this would be?? ive seen small pieces broke off before but this looks pretty bad lol also the cylinders look great. bore might be egged out or maybe bad piston clearance and cracked a piston skirt and it sucked it up in the top end causing it to pit the piston post pics please Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted September 21, 2011 Report Share Posted September 21, 2011 Just like he said, broken skirt. Maybe from cast pistons either stockers or , namura,vitos. Double check crank and rod bearings and bore clearance/ shape for wear. Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted September 21, 2011 Report Share Posted September 21, 2011 too much timing, too little octane, too little compression, too much power for cast parts, run too lean, not enough oil...... there are probably a hundred different combos of shit that could have gone wrong. we need ALOT more info (and pictures of carnage are always fun to look at) about your bike and what your running in it and how much before we can even being to take rough guesses as to what went wrong with your bike... Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 21, 2011 Author Report Share Posted September 21, 2011 my bike is ported, stock bore and stroke, toomy t4's, k&n with holes in lid, vforce reeds, coolhead, plus 5 timing, stock carbs Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 21, 2011 Author Report Share Posted September 21, 2011 and i run 93 oct fuel at about 40:1, pics soon to come Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted September 21, 2011 Report Share Posted September 21, 2011 What head are you running? Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted September 21, 2011 Report Share Posted September 21, 2011 and i run 93 oct fuel at about 40:1, pics soon to come What cc domes are you running in your coolness? And what's your altitude above sea level......and your jet sizes.. Quote Link to comment Share on other sites More sharing options...
TIM LUTZ Posted September 23, 2011 Report Share Posted September 23, 2011 Can you post some pictures? Most of the time when you lean it out real bad the top ring will pinch on the exhaust side and cause the piston to rock so much it will usually bust the skirt. Quote Link to comment Share on other sites More sharing options...
camatv Posted September 23, 2011 Report Share Posted September 23, 2011 umm your shiot broke.. bore it fit new pistons check the crank put it back together and tune it in ride it Quote Link to comment Share on other sites More sharing options...
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