Despite soaking carb in cleaner and checking all fuel flow is OK, my Tohatsu still misfires when revved under load. Tickover is fine. Misfire occurs when revving up and after a few seconds variable 5 secs to 45 secs it dies. It's got to be a fuel problem hasn't it?
One would assume so but as you have not mention if it is a 2 stroke or 4 stroke , that assumption would possibly be wrong
2 strokes use reed valves between the carby and manifold and the crankcase and in outboards these reed valves can split and not function properly especially at higher prms
these reed valves allow fuel mixture in when the piston goes up and shut off when the piston comes down creating a pressure in the crankcase which pushes the mixture up the bypass of the cylinder into the combustion chamber
if these reed valves are not working properly or the crankshaft seal are failed this compression in the sump doesn't occur properly and engine running problems result
IF it is a 4 stroke the soaking the carby in cleaning fluid will only remove 1/2 the problems
It is best to have the carby fully overhauled by an accredited outboard mechanic as there will still be corrosion in the body and mixture passages that cleaning fluid alone will not remove.
have the ignition system checked as it may be an overheating component ( coil --ignition module) that is causing the failure.
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