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Old 12-03-2012, 03:02 PM   #4
Joined: Oct 2009
Location: Bellevue, Nebraska
Oddometer: 1,140
Could be cold seuizure, if it hasn't been allowed to warm up properly. Is the piston scored similarly?

Could be, as noted earlier, dirt/sand getting in to the engine, but that usually makes everything look very smooth.

Could have been overheated.

There are a lot of things that could cause it; timing chain is not one of them. If you can, post pictures of the cylinder.
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