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Can any 1 tell me what would lead to this ?

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Looking for parts for my 1997 AC ZR 580 efi, engine cylinder, and other parts .
 

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check for a cracked rubber boot for the efi, could have leaned out and burned down. I also have read that the 580 kinda eats pistons. From what I have read they wear out on the top and start to rock in the cylinder, eventually cracking the skirt off. hope that helps any.
 

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It could be improper warm up. I bought a 97 efi 580 from a guy with a broken skirt on the piston and that's kinda what it looked like.
 

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I would definatly check for leaks at the intake boots and the crank seal. Not sure why, but Ive seen ots of 580s with the same problem. Good luck with the rebuild.
 

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The broken skirt is on the intake side. Intake skirt damage is often the result of snow ingestion. It looks like the skirt weakened and the bits went down into the case and then up through the transfer ports and they bounced around in the combustion chamber before heading out the exhaust. There is a little bit of rounding over of the piston edge on the exhaust side, but not enough to say it was a lean burn down. All my experiences with lean burn downs in my 580 show much more damage and melting of the piston edge at the exhaust.

My guess is that the skirt was fatigued and broke from the stress of normal operation. How many miles are on the the pistons? It is difficult to assess the cylinder from the the pictures, but ti doesn't look damaged. You probably need a head because yours looks a little too abraded to clean up. A head and a couple of new piston kits is probably in order. Rec Supply in Saskatoon, Rec Supply, can get you aftermarket piston kits, SPI and Wiseco, they can exchange your cylinder if needed, but heads are more difficult to come by. Some dealers may have heads in the their junk, or salvage parts bins.
 

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I agree with 94ZR580 it looks like a broken skirt that caused the damage. Do as Matrick98Z said and make sure they are no air leaks on the engine. If you do not find a problem with the intake boots I would advise doing a pressure check on the engine just to make sure all is good.

Hope this helps jeff
 
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