On those yamaha engins it is usely the stator thats the problem.
SOURCE: 40hp 1987 yamaha outboard motor will run for 30-60
Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.
SOURCE: outboard motor idles but will not speed up
You really have to blow out the jets to clear any varnish left over from lay up.
SOURCE: my yamaha 130hp outboard starts and runs good but
The carbs need to be cleaned.There is a high speed jet in the carb that is more than likely stopped up. Jim OMC retired mech.
SOURCE: We have a 1996 Yamaha 40 hp outboard motor. If the
you have a short or another wiring problem
SOURCE: Evinrude outboard hard to start
If it is flooding then you need to remove the carbs and check your float level and see if your needle and seat are worn out. If you hold your carb upside down with the bowl off then your float should be level straight accross. If it is not straight accross then you can bend the tang by the needle until it is level.
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