Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 155Get this manual
OK Troubleshooting 1.Troubleshooting List
Boat cannot run at high speedEngine speed is very high causing high speed ESG to operateEngine stalls immediately after startingDefective accelerationEngine speed is lowEngine will not startEngine overheatsIdles abnormally
Probable Cause
Fuel level is low in the tankFuel system connection is incompleteFuel pipe is twistedAir vent screw is closedFuel cock or carburetor is cloggedLow quality gasoline Fuel is fed excessivelyCarburetor is maintained poorlyEngine oil is deterioratedEngine oil level is too highEngine oil lacksUse of spark plugs not specified