powerloss need help

[enik198888]

i just got a 1985 bayliner w/a 85 hp force the boat had sat for a while long enough to rot the floor out.took it to the lake the it ran like a scolded dog for 4 hr. then while i was full throddleit lost some power. i herd it drop off.. it studder alittle motor sounds good at low speed doesnt have enough to get on top now is this a fuel problem? the boat had 1/2 tank of old gas and i add 10 gal. to it .i pulled the plugs they had a hard black coating on them did water foul one?any help will help

 

[12Footer]

Re: powerloss need help

You will need a can of spray carb cleaner, a set of plugs (champion UL18V or equiv), ValvTect outboard decarb cleaner (available at most boat dealers),and a screwdriver.<br />Old gas is the biggest problem reported here on Iboats, and I can't stress enough the importance of getting old gas out of the entire system before using the engine, and do it every season.<br />What you now have in your tank is new gas mixed with varnish.<br />The next step is to remove the fuel filter located in the fuel pump (one screw holding the cap on which this screen is under),and cleaning it with the carb cleaner spray.<br />Remove and replace all inline filters.<br />Decarb the engine before replacing the plugs.<br />Follow the directions on the can.<br />Install the new plugs.<br />If possable,remove the carb bowl,and clean it out with the carb cleaner. While you have it off,spray some up the intake tube.move the float by hand (carefully,as it's easy to bend the seat tang out of adjustment),and make sure the needle valve is not sticking.<br />Re-assemble the carb's bowl, and take it for a ride.

 

[enik198888]

Re: powerloss need help

did everything you said except for getin rid of the old gas...the boat started right up and ran for 2 hours befor it did it again...i pulled the plugs on the water they had black thick varish on them cleaned them....and the fuel filter boat ran once again...the old gas must be the problem thanks for all...glad to see it run again...next step is to get rid of the old gas........