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[QUOTE="David Trustrum, post: 96891, member: 21529"]
Bummer!!

A slight wear mark?  What does that mean?  If the piston failed & there is no damage to the plating  yeah sure throw another piston in it.  But if any of the plating is damaged it’ll pick up in no time so is false economy.  If unsure take it to a decent mechanic as impossible to diagnose without seeing it.  I never hone plated cylinders, just scotchbrite them.  A normal hone is too imprecise I feel.

One question would be why & how did the piston fail?  If there is a chunk out of it -did it suffer detonation? & is there aluminium smeared all about the place?  That ‘wear mark’ could be piston ally & can be removed with caustic soda on a rag over night.

Warning Caustic soda is not to be messed with without precautions.  Even though you can buy it from the local supermarket wear glasses & gloves.  Avoid getting it over aluminium surfaces you don’t want to eat away.  Dangerous stuff near skin & eyes!

Why did it detonate or seize should be investigated.  ie airleak, lean, timing etc.

Or did the piston crown separate from the rest of the piston?
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