Re: force 125..'87 boggs down
Look for collapsing fuel primer bulb, clogged screen at fuel pump. partially clogged fuel line, partially clogged fuel filter (if equipped with one), Sticking or clogged inlet needle in carburetor, improper float level in carb, varnish or congealed oil in carb passages, Clogged fuel filter inside tank (if so equipped). Clogged tank vent or vent not opened.
Note: six gallon and other portable tanks have a vent in the filler cap and some have a screen on the pick-up inside the tank.
Concentrate on areas before the fuel pump because your problem sounds like the typical lack of fuel related to clogged lines. The pump uses suction to pull fuel from the tank. It can supply enough fuel at idle and the carbs fill up. it will run fine for several seconds at full throttle but the carbs demand more fuel than it can suck at full throttle. As the carbs run low on fuel, it slows down. Back it down to idle, and the fuel pump can again supply enough to fill the carbs.
