40 HP engine problem

[randyrynn]

Hi,

Need advise any one know the problem regarding power supply not stable. senario case, when trothel rev to increase power till Half, the engine start loosing power. checking on the spark plug, look like over supply fuel (wet ).

[99yam40]

posting complete model # will help
as we have no idea what 40 hp motor you have

[TiMn8er911]

Hi,

Need advise any one know the problem regarding power supply not stable. senario case, when trothel rev to increase power till Half, the engine start loosing power. checking on the spark plug, look like over supply fuel (wet ).

I had this issue last season. I replaced all 3 spark plugs and i had no isse after. Motor got up and went even thou the old plugs looked fine.