Maintenance & Technical > KX500 Original

kx500 piston seizure

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bruuuuup:
I already sent the motor BACK to get fixed, but here is the plug pics, the piston and rings came all apart on the exhaust side and smashed all the pieces into the plug and the head, I mean I could hear it destroying everything, chunks of the ring stuck all in the head, The piston had some burnt oil Below the bottom ring (brownish color) , greenstreak it is interesting that u say the seal cause the gear oil was a silver or gray color the two times I drained it, would the gear oil turn that color from the premix fuel (pump gas klotz r-50)   Thanks for the help I just want to find out what the hell happened....BTW this insane motor pulled the whole time till it smashed the plug to nothing, CRAZY

Polar-Bus:

--- Quote from: bruuuuup on November 04, 2010, 01:30:59 PM ---I already sent the motor BACK to get fixed, but here is the plug pics, the piston and rings came all apart on the exhaust side and smashed all the pieces into the plug and the head, I mean I could hear it destroying everything, chunks of the ring stuck all in the head, The piston had some burnt oil Below the bottom ring (brownish color) , greenstreak it is interesting that u say the seal cause the gear oil was a silver or gray color the two times I drained it, would the gear oil turn that color from the premix fuel (pump gas klotz r-50)   Thanks for the help I just want to find out what the hell happened....BTW this insane motor pulled the whole time till it smashed the plug to nothing, CRAZY

--- End quote ---

Obviously you had a total piston granade failure. My guess is your cylinder was junk to begin with, and someone just threw in a new piston.  We can't help you without pics of the piston and cylinder. Also be more specific with details  in regards to the prior "brand new motor"  ?? 

Danger4u2:
The gray color in the oil is from the aluminum plates in the clutch.  Mine is always like that, I change it often, it's only a few buck to change oil.

dave916:

--- Quote from: Danger4u2 on November 05, 2010, 12:15:48 AM ---The gray color in the oil is from the aluminum plates in the clutch.  Mine is always like that, I change it often, it's only a few buck to change oil.

--- End quote ---
the grey colour in gear oil could be caused by a water pump seal, especially if you gear oil level is rising and water level going down,  i use steel plates in clutch, [suppose to act a bit like a flywheel weight]

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