Bamajoe Posted March 30, 2013 Report Posted March 30, 2013 Ok so I'm new here..... I've got a question for ya'll... Heres the story.. Guy brought a banshee into the shop, had ran it lean and it was destroyed... Wanted us to put a big bore on it... So we ordered an Athena 392 big bore kit.. Put it all together,it ran beautiful... He picked it up, we explained the importance of proper fuel mixture, 96 octane gas (recommended by the kit) and away he goes... Well he was back that afternoon... Said one sparkplug has come loose so he stopped and tightened it an now it "won't kick".. He had ran 2 tanks of gas thru it and it's locked up tight. He admitted to running "cheap gas" in it... Heres what it looks like. Right piston Left. Head What I dumped out of the right pipe. Ok so was this the result of low octane fuel in a hi-compression engine? Tan what only one cylinder destroyed? Carbs not synced right? Or what? Quote
Nieskes Posted March 30, 2013 Report Posted March 30, 2013 What was the compression ratio? What was the timing set at? Quote
Sandking Posted March 30, 2013 Report Posted March 30, 2013 Ran it lean main jet was probably too small Quote
Bamajoe Posted March 30, 2013 Author Report Posted March 30, 2013 11.9:1 I believe.. Ha I think I may have gotten my rights and lefts mixed a bit in the post.... Quote
Bamajoe Posted March 30, 2013 Author Report Posted March 30, 2013 Ran it lean main jet was probably too small Possibly.. we did nothing to the carbs because it was already bored (before he brought it to us) but why just one side? Quote
Nieskes Posted March 30, 2013 Report Posted March 30, 2013 That does not look like a carb issue, it looks like detonation, and if he says his plug backed out that is another hint toward detonation. Quote
Bamajoe Posted March 30, 2013 Author Report Posted March 30, 2013 11.9:1 I believe.. Ha I think I may have gotten my rights and lefts mixed a bit in the post.... Im not sure about the timing... I'm supposing it was stock... Quote
Bamajoe Posted March 30, 2013 Author Report Posted March 30, 2013 That does not look like a carb issue, it looks like detonation, and if he says his plug backed out that is another hint toward detonation. Ya that's what I figured... But I'm not sure because it doesn't quite make sense to me that only one side would be destroyed... The other is perfectly fine... Quote
wacko2000 Posted March 30, 2013 Report Posted March 30, 2013 Whats the name/location of your shop?? Did you perform a leak down and check compression before releasing it back to the customer?? Probably should have went ahead and confirmed what caused it to pop the first time before letting the customer drop all this coin This happened to me a few years ago, it was caused by a massive air leak. Joe Quote
sprinklerman Posted March 30, 2013 Report Posted March 30, 2013 Whats the name/location of your shop?? Did you perform a leak down and check compression before releasing it back to the customer?? Probably should have went ahead and confirmed what caused it to pop the first time before letting the customer drop all this coin This happened to me a few years ago, it was caused by a massive air leak. Joe this^ No disrespect ,but whats crazy is you are a "shop" that charged a customer to do work and are on here asking "newb" questions. Quote
Bamajoe Posted March 30, 2013 Author Report Posted March 30, 2013 Just a small one mechanic atv/small engine shop in rural Alabama.... Quote
Jereme6655 Posted March 30, 2013 Report Posted March 30, 2013 it actually seems to have the APPEARANCE of a lean condition.....but I don't think a lean condition would have caused the center of that piston to break free. The spark plug backing out is also a KNOWN sign of detonation. By him continuing to ride the bike after the plug backing out (while running less than 96 octane fuel) would surely void any warranty that even Athena would offer. You cant be responsible for someone NOT running what is recommended. That's like someone telling you not to stick your dick in a hole cause it'll get cut off and you do anyways....then him trying to sue you. Don't let him try to blame you. Quote
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