Hello,I own a yamaha 30hpcv 2cyl outboard that starts to hesitate/stumble ending up fouling the plugs 10 min after driving at slow/moderate revs,i always use premium fuel mixed at 100:1 but iv,e notice when i give it more throttle it seams to clear up but returns at lower revs.I,ve put in new plugs as recommended in owners manual but the problem continues,maybe it is a carby issue,if so how do i ajust it?
any advice would be appreciated.