Mercury 200-HP Black Max Won't Run At High Speed

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  Mercury 200-HP Black Max Won't Run At High Speed

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Author Topic:   Mercury 200-HP Black Max Won't Run At High Speed

bigboz1970 posted 04-12-2009 01:03 PM ET (US)
[This author says that his Mercury 200-HP Black Max won't run at high speed for more than a few minutes in spite of having replaced all the fuel lines, a new primer bulb, and a rebuilt fuel pump. He seeks advice on repairs.]
jimh posted 04-12-2009 02:58 PM ET (US)
If the engine speed drops slowly from high-speed operation, your problem is likely fuel related. If the engine speed drops suddenly, the problem is likely electrical in nature.
brisboats posted 04-12-2009 07:35 PM ET (US)
Check the stator it has a high speed winding and if you cannot remember the last time it was replaced it is probably due.
Brian
grizzly posted 04-12-2009 08:46 PM ET (US)
I had that problem a few years ago with my 1986 Merc Black Max 150. It turned out to be a plugged pick-up tube in the fuel tank under the deck of my 1986 Outrage 18. To make a long story short eventually I replaced the tank.
Test to see if this is the problem by running the engine off a portable tank on deck.

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Author	Topic: Mercury 200-HP Black Max Won't Run At High Speed
bigboz1970	posted 04-12-2009 01:03 PM ET (US) [This author says that his Mercury 200-HP Black Max won't run at high speed for more than a few minutes in spite of having replaced all the fuel lines, a new primer bulb, and a rebuilt fuel pump. He seeks advice on repairs.]
jimh	posted 04-12-2009 02:58 PM ET (US) If the engine speed drops slowly from high-speed operation, your problem is likely fuel related. If the engine speed drops suddenly, the problem is likely electrical in nature.
brisboats	posted 04-12-2009 07:35 PM ET (US) Check the stator it has a high speed winding and if you cannot remember the last time it was replaced it is probably due. Brian
grizzly	posted 04-12-2009 08:46 PM ET (US) I had that problem a few years ago with my 1986 Merc Black Max 150. It turned out to be a plugged pick-up tube in the fuel tank under the deck of my 1986 Outrage 18. To make a long story short eventually I replaced the tank. Test to see if this is the problem by running the engine off a portable tank on deck.