Yz125 no start mystery shavings

m1ke20012
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m1ke20012
Edited Date/Time 10/10/2018 5:08pm
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?

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m1ke20012
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m1ke20012 9/18/2018 2:17pm
9/18/2018 2:17pm
Keep in mind it wouldn’t start before taking it apart.
project racer 9/18/2018 3:13pm
9/18/2018 3:13pm
Looks like cast material, meaning piston. That one sneezed hard to blow all that material back through the reed petals like that.
kb228
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kb228 9/18/2018 4:30pm
9/18/2018 4:30pm
Its your piston skirt. Time for a full motor rebuild
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Falcon
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Falcon 9/19/2018 11:52am
9/19/2018 11:52am
Broken pieces of piston. Take that whole cylinder apart and inspect for damage.
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m1ke20012
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m1ke20012 10/10/2018 5:08pm
10/10/2018 5:08pm
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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