slyslkwckd Posted February 11, 2007 Report Posted February 11, 2007 My motor siezed up. After removing the head i found a chunk missing from the head, a hole in my piston on the right side. I have porting done (duner port), milled head, v force 2 reeds, t5's, timing plate advanced to +4, stock carbs, k&n filters, runs race fuel mixed 32:1. All weekend long shee ran great. On the last day i was duning and shee blew up! I am getting a Noss head but im not sure on what size domes. Also need some thoughts on why shee blew in the first place. Thanks :shoothead: :shoothead: :shoothead: :shoothead: :shoothead: :shoothead: :shoothead: :shoothead: :shoothead: :shoothead: Quote
theshee Posted February 11, 2007 Report Posted February 11, 2007 Could have been lean and burned a hole in the piston. About the domes what altitude are you at, and what kind of gas do you want to run? Quote
slyslkwckd Posted February 11, 2007 Author Report Posted February 11, 2007 (edited) I ride in glamis not sure of the altitude i was running 110 octane. Shee has been running fine the last change i made was changing the rear sprocket from 44 tooth to stock but i dont think that would affect it running lean. Edited February 11, 2007 by slyslkwckd Quote
Banchetta Posted February 11, 2007 Report Posted February 11, 2007 Gearing up higher would put more load on the motor therefore creating a leaner condition. Not much, maybe one size. You could've been lean to start and that might push it over the edge....A hole in the middle of a piston is usually from detonation. Too high of compression w/o race fuel, but you were running race fuel, which would make me look into head design...you shaved .030 off the stock head. I've always seen bad things w/ this, although a lot of people on this board have 0 problems..a Noss head would be a good idea... if your running lean, then more piston melting would have been towards the exhaust side. Make sure you check the water impeller while you have it apart and check the jets in the carbs to make sure nothing was plugged, mainly the right side. Quote
slyslkwckd Posted February 13, 2007 Author Report Posted February 13, 2007 thanks for your help i appreciate it... Quote
jmd0346 Posted February 13, 2007 Report Posted February 13, 2007 (edited) thanks for your help i appreciate it... A hole in the piston is flat too lean or too much timing. Gearing shouldnt matter as long as you have it jetted right. If that was the case you could/would be rich in some gears and lean in others. The load on the engine changes every time you shift. Whats your carb/jetting setup, elevation? You guys shouldnt make post about problems without that kind of info. Edited February 13, 2007 by jmd0346 Quote
slyslkwckd Posted February 14, 2007 Author Report Posted February 14, 2007 A hole in the piston is flat too lean or too much timing. Gearing shouldnt matter as long as you have it jetted right. If that was the case you could/would be rich in some gears and lean in others. The load on the engine changes every time you shift. Whats your carb/jetting setup, elevation? You guys shouldnt make post about problems without that kind of info. This post has been edited by jmd0346: Yesterday, 08:54 PM I thought i posted that stuff on there....(330 jets in the carb) its cool though i'll figure it out myself.... Quote
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