Help.. flipped piston
Unofficial HDF Chaplain
Joined: Dec 2009
Posts: 21,160
Likes: 18,082
From: san diego
pistons don't die... they are murdered!!! lugging usually causes detonation,aka hole in the top. this motorwas running hot, and hard!! more than likely either too much piston to cylinder clearence, or it ran too hot, cuasing the skirt to collapse, and "flipping" like that. almost all the time, that piston goes into pieces, rod looks for some fresh air, and pokes out the case or breaking the cylinder. actually you may have gotten lucky, with regards to damage. but I would bet that rod is bent/damaged as well. also check crank runout after that little event.
Last edited by harleycharlie1992; Jan 28, 2014 at 02:56 PM.
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Novice
Joined: Jan 2014
Posts: 20
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From: vegas
pistons don't die... they are murdered!!! lugging usually causes detonation,aka hole in the top. this motorwas running hot, and hard!! more than likely either too much piston to cylinder clearence, or it ran too hot, cuasing the skirt to collapse, and "flipping" like that. almost all the time, that piston goes into pieces, rod looks for some fresh air, and pokes out the case or breaking the cylinder. actually you may have gotten lucky, with regards to damage. but I would bet that rod is bent/damaged as well. also check crank runout after that little event.
did you notice the 2nd piston with detonation scorched spot?
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Joined: Mar 2008
Posts: 4,419
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From: Vermont
I think we can all agree on one point. That sucker was running hot!
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Unofficial HDF Chaplain
Joined: Dec 2009
Posts: 21,160
Likes: 18,082
From: san diego
I just did, kinda hard to tell from pics was this bike running real lean? that will raise temps. this had to be making lots of noise long before the piston failed. spark knock, piston slap. had to be telling you something was real wrong before that.
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Joined: May 2008
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From: 'Noke, VA
Da fuque?
Please give some details about the motor.....Compression, cam, fuel management, etc.
I'm looking at the pictures and I keep saying to myself, "how'd you get the beans above the frank?"
Please give some details about the motor.....Compression, cam, fuel management, etc.
I'm looking at the pictures and I keep saying to myself, "how'd you get the beans above the frank?"
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Novice
Joined: Jan 2014
Posts: 20
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From: vegas
flipped
bike was not too lean, plugs have normal coloration and carbon, nothing is showing any discoloring or 'blueing' from excessive heat, but the exhaust valve looks to be cooked as well as the top of the piston