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This may sound funny, but for a while, Yamaha put a steel bolt in the aluminum casing on the side of the motor. dissimilar metals caused extreme corrosion inside that affected operation. Check out Boating forums on Yamaha.
Have your spark plugs changed AND carbs cleaned and adjusted.
Usually that can also be caused by a seized advance system ( plate under the flywheel, commanded to turn with the throttle linkage... )
Have your mechanic adjust your idle up a bit sounds like it is idleing to slow.You might want to try some injecter cleaner in your next tank of gas as well sometimes a little dirt or sludge will cause your vehical not to get all the gas it needs when not under a load.
not sure here as i normally answer car questions but if this engine is of the new generation and its all electronic then it has to be plugged in to locate the fault .My outboard was playing up like this with loss of power and the dealer wanted a small fortune to repair the pump which feed the fuel injection system so i took it apart and made a new valve for it out of a piece of fishing hook plastic wrapper and a bit of copper wire hook type thing i made and that was about 5 yrs ago and its still running fine
It's possible that a little fuel vapour come out of a carb on an hot engine that has just stopped.
Does the motor starts again and runs well in higher rpm ranges? Is the stall only when idling? If so, enrich the idle fuel mix ( screw out the idle mix screws half a turn t a time )
hi take the prop off see if there is anything /string/ between the hub and the housing check oil lvel in g/box /is gear box nice and free if all is ok try it in ware with just a small amount of choke
drain /empty fuel out replace with fresh /correct oil mix
check /change fuel filter/air filter
warm engine up check idle mixture ajustment/tick over speed
increase idle speed slightly/7/800 rpm
hope this helps merlin v 12
While at the river try to adjust the fuel air mixture. When you are on the water it puts the engine under a load and if that dont work then dont be afraid to bump up the idle stop screw slightly.
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