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Tohatsu M40C outboard misfire when advancing throttle slowly, seems OK when throttle moved to max RPM quickly. Have replaced CD unit to no avail. suggestions please.

Original fault appeared to be carby, but guy says float set to correct height now, I still think carby float level too high? As I said CD unit has been replaced and coil has been checked.

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Posted on Jan 02, 2017

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SOURCE: i need a free workshop manual for tohatsu outboard

how can i get service manual for a tohatus m40c 1992?

Posted on Apr 14, 2011

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Misfire on Tohatsu outbaord.


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
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IF it is a 4 stroke the soaking the carby in cleaning fluid will only remove 1/2 the problems
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You can contact Tohatsu directly using the form provided at the link below.

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