1993 225 yamaha stalling

shadygrady

Recruit
Joined
Aug 21, 2011
Messages
1
my engine runs great at high rmp however at mid range 12 to 25 runs rough and will stall if I do not milk the throttle.If I shut motor down and restart after 1/2 hour or so the engine will stall under load if out of gear it will rev up fine. If I can get it to close to full throttle quickly with out stalling it runs great.changed the water / fuel filter ,changed plugs and replaced two of the fuel pumps I have never changed the prime fuel pump would be gratefull for any help. Bob
 

SparkieBoat

Captain
Joined
Aug 17, 2009
Messages
3,643
Re: 1993 225 yamaha stalling

I would rule ouit fuel pump issue if it does good at high RPMs..but you could try pumping the bulb while it is giving you trouble and see if it helps..I am thinking you need to clean the carbs..maybe the idle passages are clogged, or someone messed with the idle air screws. check linkage and timing also. also check compression and spark, see my sig below.
 
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