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Old 18-09-2019, 07:11 PM   #8
350TSS
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Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,417
With a higher than standard compression ratio you probably need to adjust the ignition timing a few degrees (cannot remember which way - advance or retard - probably retard). The extra compression would make it run hotter anyway but if the spark timing is sub optimal that will definitely make it run hotter still. Extra heat > lubrication breakdown > ring and bore wear > excessive pressure in crankcase - maybe?
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