60 HP yam 2stroke missfire

[Gords]

HI
Motor runs well until i start to trawl , starts missing and fouling the number 3 plug. Any suggestions

[Poly]

is it autolube or are you adding the oil to the fuel (premix)? Plug fouling on premix at low revs is a widely recognised problem - assuming you are adding the right amount of oil (e.g. not adding "a bit for luck" or just guessing) then not sure much can be done to avoid it - other than a blast of power every so often.

[Peter_C]

Throw a couple buckets in the water to slow the boat down, and up the RPM's to keep the motor working harder so it doesn't foul the plugs.

[Gords]

It is premix , mixing 50-1 . Say i mujst check carb float level and coils.

[Davie]

Fuel pump diaphragm.