having problems with force 85 please help

just bought it, its pushing a 16 ft maxam bow rider.ran fine for first 5 min real strong. then it crapped out on the top end ,would putt around to quarter throttle fine but you try to open it up and it would stall its self out. but sometimes it would kick in, you would be putting back to the trailor and hear the motor change pitch and you thottle up and your gone but two hundered yards and your done. found out the guy started it before he brought it over on the scaps of gas from last year. we took the bowels off and they all had dirt in them we cleaned the carb with spray carb cleaner and cleaned the screen put it back together and took it out it ran for 5 min and crappped out agiain any help? thanx in advance

Re: having problems with force 85 please help

You will get better help if you post the model number of the motor. Could be fuel related or electronic. The best route to follow is to get compression tested, spark tested. Then rebuild the carbs and fuel pump and do a link and sync. What color stator does this motor have. Red or black. Pull all the spark plugs and look at the tips. Describe how they look. Black and oily, Brown and dry. Two dirty and one clean. How the plugs look, The color of the stator and the model number are free so do those first then post the results back here.

Re: having problems with force 85 please help

If the junk in the carb bowls looked gritty and black, it is most likely from a defective fuel pump diaphragm. The fuel pump is on the side of the engine just below the electronics. Six screws hold the cap onto the body. Order a new diaphragm and gasket and replace both on general principals.--It will only cost about 6 bucks.

Then buy a 3 dollar plastic automobile fuel filter and install it between the fuel pump and carbs.

If the problem still continues, check for clogs in the fuel line from the pump back to the tank. If you have a quick- connect on the tank, remove and clean the male fitting from the threaded end. It collects crap inside behind the ball and spring