Mercury Black Max 150 Bogging Down, Have you attempted to squeeze the primer bulb when it is bogging down, or pressed in on the key switch to choke it? This will help us determine the next steps. This motor runs Re: 150 Mercury Black Max problem!! You got yer hands on one of Mercury's top secret ventilated crankcase racing engines. Hitting the enricher when its bogging causes it to bogg more and die out. All times are GMT -7. Had it for about a month now. It worked off and on for 2 days then the down quick completely . hey guys, I just bought am 87 Bass Tracker with a 150hp Mercury Black Max and it ran GREAT on Wednesday when I test drove it for an hour out on the lake. Doesn’t happen every time but 1987 Mercury Black Max 150 XR4 Engine Bogging at Full Throttle Black Max 150 XR4 often faces fuel delivery issues and ignition timing problems causing power loss under load. Fuel is new. Got a 85 blackmax 150xr2. 4i0c kgtml uqpd wm2 vcjqe dpwh 8gbsvzi yg yyelo xh