Yz125 no start mystery shavings

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9/18/2018 2:16 PM

I started working on this yz125 and found it had spark with brand new sparkplug. Compression seems sorta low but upon checking the intake into the crankcase I found all these not so much shavings but pieces or chunks of metal and I opened the combustion chamber open and it seems to be intact. Any ideas? Photo
Photo

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9/18/2018 2:17 PM

Keep in mind it wouldn’t start before taking it apart.

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9/18/2018 2:26 PM

Piston skirt/rod bearing maybe, are they magnetic???

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9/18/2018 3:13 PM

Looks like cast material, meaning piston. That one sneezed hard to blow all that material back through the reed petals like that.

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9/18/2018 4:30 PM

Its your piston skirt. Time for a full motor rebuild

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9/19/2018 11:52 AM

Broken pieces of piston. Take that whole cylinder apart and inspect for damage.

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Braaapin' aint easy.

9/20/2018 4:55 AM

Here is my mystery shavings..". Photo

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9/20/2018 6:56 PM

Classic stitch up

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10/10/2018 5:08 PM

Falcon wrote:

Broken pieces of piston. Take that whole cylinder apart and inspect for damage.

You ended up being right. I since repaired it. Wasn't expecting the skirt of the piston be in a million bits.

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