4 weeks ago i went through that same scenario with a big bore twin. i dont think its a common occurance and i did correspond with a few knowledgeable folks after i ordered the parts but before i fixed it and everybody seem to think i was on the wrong track. the way you should look at it is if the pistons look rough they should be replaced so dooit and take it from there.
Piston Scoring
Does anyone know if a semi-bad scored piston and cylinder sleeve would cause an engine to sputter and flood under load? Like pinning the throttle of the line or anywhere after 3/4 throttle? The engine will cruise along fine at low rpm's. Thanks for readin!
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