Piston Pics

First dirtbike and wondering if this is normal. It's a 2004 Cr125.

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the brown streaks are from blow-by. time for a topend

normal and time to change

that looks like a hellacious amount of scuff markings. replace for piece of mind

Even if it starts up first kick and has 180psi compression?

Yes!!!!!

Even if it starts up first kick and has 180psi compression?

Compression tells you that the engine will start and that there are no catastrophic failures. But it cannot tell you what is about to fail.

Those rings are worn, there is blowby, the scuffs are probably from a bit of cold siezure (starting the bike and riding right away without warming it up).

Looks like some blowby, but i wouldn't be worried about the scuffing.

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