250Rho Posted July 4, 2009 Report Share Posted July 4, 2009 just did the whole enging now its together and we started it it idled with the choke on for a while then turned the choke off and the engine started to pick up so i got a screwdriver to ajust the idle then it started predetonating and sounded like it was running fuu throttle. so natrally i shit my pants and ripped the kill switch...didnt die,tore the wires out of the stator...didnt die,pulled of the plug wires...didnt die,tureded of the gas finaly died but it wasent because it ran out of gas. i think she is ok i fixed a air leak and got through a heat cycle or two and it did it again :: could it be predetonating on low octane gas or assymbly lube on the piston ist making a shit ton of compression im not sure everybody in the shop that day was like wtf :shoothead: :shoothead: :shoothead: btw the compression ratio is stock and i know shit ton isnt a good measurement but ill have real compression readings on monday or tuesday this week please help :shrug: Quote Link to comment Share on other sites More sharing options...
ToomeySheeLE Posted July 4, 2009 Report Share Posted July 4, 2009 Any chance one of your carb slides is getting stuck open? Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted July 4, 2009 Report Share Posted July 4, 2009 Did you pressure test the motor after the cycles to rule out more air leaks,6lbs for 6min,its a must along with a compression test,squish test Quote Link to comment Share on other sites More sharing options...
250Rho Posted July 11, 2009 Author Report Share Posted July 11, 2009 thersno way the slides were stuck and i kow now there was a pretty massive airleak that has been fixed and it hasent done it since but what i want to know is why it ran after i killed the ignition was it predetination it sounded like someone was holding it wide open not sputtering popping or anythin just waaaaaaaaaaaaa and a litle bit of wtf Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted July 12, 2009 Report Share Posted July 12, 2009 There was so much heat from being lean on the air leak it detonated the fuel,we call it dieseling Quote Link to comment Share on other sites More sharing options...
x_doug_x Posted July 12, 2009 Report Share Posted July 12, 2009 i had the same problem bout 3 weeks ago, i was adjusting the carbs, i had to pull the carbs out of the intake to kill it. after disconecting the tors, it didn't do it again. Quote Link to comment Share on other sites More sharing options...
sheefreak Posted July 12, 2009 Report Share Posted July 12, 2009 Sleeper is correct. Best way to stop it is hold the brakes and pop the clutch.... Your air leak would/could be a direct cause of this. A lean condition of any kind... Quote Link to comment Share on other sites More sharing options...
SheeBang92 Posted July 12, 2009 Report Share Posted July 12, 2009 Any chance one of your carb slides is getting stuck open? x2 on this mine got stuck half throttle and predetonated and scared the shit outta me so i started pulling wires and shutting broken fuel shutoffs off that didnt stop fuel flow then i ripped seat off and plugged intakes with my hands here one carb slide was stuck open just a little bit put them in sync again and then try it. Quote Link to comment Share on other sites More sharing options...
250Rho Posted September 23, 2009 Author Report Share Posted September 23, 2009 fresh rebuild it didnt even hsve the chain on it or i would have just poped t in gear and killed it but we know now it was the air leak must have been deseling from the assy lube and the lean mix confused me caus it was runnin so smooth. wasnt makin any unusual noise sounded sweet but was going ape shit Quote Link to comment Share on other sites More sharing options...
Coupelx Posted September 23, 2009 Report Share Posted September 23, 2009 detonation and preignition are 2 different things. Quote Link to comment Share on other sites More sharing options...
blowit Posted September 23, 2009 Report Share Posted September 23, 2009 detonation and preignition are 2 different things. X2 http://www.streetrodstuff.com/Articles/Engine/Detonation/ Predetonation???? Is this where TNT pops before the button is pushed??? lol Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted September 23, 2009 Report Share Posted September 23, 2009 Good find blowit. Thats a kick ass article. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted September 23, 2009 Report Share Posted September 23, 2009 I have read a similar article but now have it saved ,Thank you Quote Link to comment Share on other sites More sharing options...
Coupelx Posted September 23, 2009 Report Share Posted September 23, 2009 X2 http://www.streetrodstuff.com/Articles/Engine/Detonation/ Predetonation???? Is this where TNT pops before the button is pushed??? lol i think its where you go off before you get a chance to pull out Quote Link to comment Share on other sites More sharing options...
250Rho Posted September 23, 2009 Author Report Share Posted September 23, 2009 i guess it was pre ignition but i guess it still raises the question why does the bike run hotter with fouled plugs and overheats Quote Link to comment Share on other sites More sharing options...
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