2000 Yamaha 15 2-stroke sputtering during acceleration

Outrider42

Recruit
Joined
Jun 19, 2011
Messages
1
Since the day I took this engine out of the factory box it has sputtered and smoked more than normal as if it were running on one cylinder, but only during the initial part of throttling-up to full power. The only part of the power band this occurs at is from 5-15%power. Everything else is fine. Any ideas on what could be causing this?
 
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