Continuous idle adjustment problem while riding

[hamdiesin]

My engine is a 6HP Tohatsu 2012.Starts perfectly with 3 pulls max but surges immediatelly and I have to lower the idle speed.Then I run on forward gear for a while and when return to idle it still surges on high speed,so I have to lower idle again.Any idea on what this problem is?

 

[Sea Rider]

Welcome to Iboats,

Is it a 2 or 4 strokes OB ? Seems a carb clean to immaculate condition is needed...

Happy Boating

 

[pvanv]

Model/serial is critical; year is irrelevant. You probably have an MFS6C. Odds are the idle circuit is clogged, and the idle stop has been adjusted too high to compensate for that. A Proper cleaning (not just a spray) and the carb will probably run a lot better. In the future, alway run the carb out at the end of each and every day, or drain it with the drain screw.

 

[hamdiesin]

Welcome to Iboats,

Is it a 2 or 4 strokes OB ? Seems a carb clean to immaculate condition is needed...

Happy Boating

Thanks Sea Rider.It is a 4 stroke OB.

 

[hamdiesin]

Model/serial is critical; year is irrelevant. You probably have an MFS6C. Odds are the idle circuit is clogged, and the idle stop has been adjusted too high to compensate for that. A Proper cleaning (not just a spray) and the carb will probably run a lot better. In the future, alway run the carb out at the end of each and every day, or drain it with the drain screw.

Thanks pvanv.
İt is a MFS6B - 3R4.Serial number 000806AX

 

[pvanv]

The carb for the 6B is more reliable, and runs better at slow speeds than the one for the 6C (it is for an earlier EPA rating), so I would definitely do a Proper carb cleaning, and then re-check the setup.

 

[w2much]

Had the same issue on mine. pvanv's advice is right on the money. Proper is the key word.