Maintenance & Technical > KX500 Original
Composite Flaking?
DoldGuy:
Gage,
That piston looks like it was washed down (coolant leaking into the cylinder) which will wash away the fuel from the piston leaving no oil to lubricate itself. Before reassembly I would flat plate the head to confirm it is perfectly flat as every KX500 head that I have checked have been warped (some much worse then others). If the piston rings are not "Pinched" in the ring grooves, you can probably have the piston coated & install a new set of rings & be okay, also make sure the cylinder does not have any aluminum transfer from the piston.
I have used these guys with positive results:
http://swaintech.com/why-coat-a-two-stroke-piston/
Hope this Info helps,
DoldGuy
Foxx4Beaver:
--- Quote from: DoldGuy on December 31, 2012, 09:04:14 AM ---Gage,
That piston looks like it was washed down (coolant leaking into the cylinder) which will wash away the fuel from the piston leaving no oil to lubricate itself. Before reassembly I would flat plate the head to confirm it is perfectly flat as every KX500 head that I have checked have been warped (some much worse then others). If the piston rings are not "Pinched" in the ring grooves, you can probably have the piston coated & install a new set of rings & be okay, also make sure the cylinder does not have any aluminum transfer from the piston.
I have used these guys with positive results:
http://swaintech.com/why-coat-a-two-stroke-piston/
Hope this Info helps,
DoldGuy
--- End quote ---
That's a good possibility....one way to tell if it was from coolant leaking,is to look at the top of the piston.If it has any white residue on there(from the water cooking),well there you go.
Gage:
I dont believe its ported. I dont see any whiteness on the top of the piston either. I think DoldGuy might be right though, Im going to take the head to some one who knows a little more than I do tomorrow. The head gasket will be arriving tomorrow or next. Also if I was to run it the way it is now vs coating the piston, what Am I risking? I mean I would hate for it to get messed up again because of how new I am to this then be down money for that too. I'm not racing this or anything, but I dont want it to run like back yard trash.
Foxx4Beaver:
have the cylinder checked for flatness too....a perfectly flat head will be useless on an un-flat cylinder :x
sandblaster:
Looks like a water problem to me as well.
Just curious, you didn't mention if you measured your crank side play with a feeler gauge.
If you didn't or don't remember what it was, now would be a good time to do it.
Also, with the stator cover off, grab on to the fly wheel and see if you can pull it up or down at all.
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