What happened to this piston ?

LuiesMaes
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LuiesMaes
Edited Date/Time 6/9/2021 6:14pm
2009 KX450
Rebuilt top end, shimmed valves, new timing chain and cylinder cleaned up with a hone.

Had roughly 6 hours on new piston. Oil changed after about 4 hours.

Pro X piston Btw
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LuiesMaes
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LuiesMaes 6/6/2021 6:12am
6/6/2021 6:12am
Possibly, I know the guy changed the oil right before this happened.
LuiesMaes
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LuiesMaes 6/6/2021 7:09pm
6/6/2021 7:09pm Edited Date/Time 6/6/2021 7:11pm
Factor E wrote:
Broken Impeller
I hope not, took it apart for the previous rebuild and the impeller was broken off.
I don’t have a clue how long it was broken for but it was definitely broken for a while judging from the gouges in the housing. This photo was after I cleaned it up with a dremel.

The Shop

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LuiesMaes
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LuiesMaes 6/6/2021 7:13pm
6/6/2021 7:13pm
Here’s what the broken impeller and housing looked like.





MKMX
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MKMX 6/6/2021 11:12pm
6/6/2021 11:12pm
Usually with a backwards oil filter and starving the engine of lube the head goes first (the furtherest point before oil returns).
FGR01
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FGR01 6/7/2021 7:17am
6/7/2021 7:17am
Looks like piston had massive lack of oil. Maybe the oil squirter jet under the piston got clogged ?
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mxrose3
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mxrose3 6/7/2021 5:15pm
6/7/2021 5:15pm
Was there coolant in the radiator when you drained it?
LuiesMaes
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LuiesMaes 6/8/2021 7:04am
6/8/2021 7:04am
Yes it was full of coolant. Looked dirty when I drained it though.
LKHill
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LKHill 6/9/2021 6:14pm
6/9/2021 6:14pm
LuiesMaes wrote:
Yes it was full of coolant. Looked dirty when I drained it though.
From all the metal in it.

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