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post #2 of (permalink) Old 12-05-2015, 08:38 AM
Triton Thrasher
Moto Grand Prix
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Seizures which mark the piston at around gudgeon pin height are typical of engines that have been detonating, usually caused by bad mixture tuning and/or bad riding (low rpm slogging).

Many designs of piston have no "flat sides" at the gudgeon pin ends. An example is the in-house Triumph piston, used before they switched to Hepolite.
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