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yz125 piston pics

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Looks wore out.  Measure the bore to make sure it is within spec and change those pistons more often.

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You heard a knocking sound? How is the rod and crank? Most of the time knocking comes from the bottom on a 2t.

The rod and crank look great

Looks quite lean how do you mix? That apart the piston looks overdue.

I mix 32:1

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The wear from the bridge on the exhaust side of the piston usually starts showing up when piston to bore clearances get excessive.

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