Originally posted by Gav
are you using an underfloor fitted tank or red plastic portable tanks?
Neither. I'm using the red METAL portable tank. I was using the original tank that came with the engine, but I changed it last season for a brand new spare metal tank that I had. I also cleaned/rebuilt the carbs. Problem went away for a while, then came back right at the end of last season.
I have now changed the fuel hose & bulb for new, fitted a water seperating filter & cleaned the carbs again but this time used new gaskets. (Couldn't fit new last time 'cause I was on holiday) As edited above, took the boat out today & it ran faultlessly.
If the problem re-occurs my next suspect is the fact that 4up at rest the engine is immersed down to about the level of the bottom sparkplug. Could be water on the plug or water being 'gulped' into the airbox & lower carb.
Hopefully it won't come to that.
P.S. Problem is engine bogs down on accelleration. Leave it idling for a minute & try again & it's usually OK. (Don't think it's oiling up though)