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    Everything done but low rpm at WOT. Distributor spring?

    That’s the only way I can get into plane. If I go gradual I can only get 2500 rpm. I have half of the throttle travel left at that point and if I mash it I get onto plane
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    Everything done but low rpm at WOT. Distributor spring?

    I am having the same problem with my Merc 350 attached to an OMC drive. When you get to 1900rpm cruise, have you tried to ram the throttle down to see if it will jump up onto plane? Mine will reach plane rpm if I smash the throttle.
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    1988 350 Stumble Problem

    I thought I would update everybody. I replaced the coil. I noticed with the timing light that cylinder 1 would skip every few rotations. I replaced the coil and that issue went away. I pulled the carb and checked the float level and checked the choke pull off, secondary, and accelerator...
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    1988 350 Stumble Problem

    I agree with that. Doesn’t the fuel pump produce a set fuel pressure at any given rpm whether it is under load or not?
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    1988 350 Stumble Problem

    1795-9286 was on the boat when I bought it and the replacement matches.
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    1988 350 Stumble Problem

    My dwell is currently at 30* and the manual calls for 29* +-2* and I have not checked the mechanical advance. That could be part of my problem. It seemed that as the day went on it freed up. Wishful thinking. I feel like at 4K rpm the boat was ripping and sounded great. I would assume that when...
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    1988 350 Stumble Problem

    I have a new coil that I will likely install anyways. If it wasn’t the problem, then I still have a spare. I am guessing that everyone is going to get caught up on the gas tank. Fuel pressure can be tested with the boat on the hose. If I have pressure from idle to redline in the driveway, the...
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    1988 350 Stumble Problem

    The carb is not the original to the boat. I’m not confident that the carb I replaced is original either. When I punch the throttle and get up onto plane, it does not surge or lose power. It will ride along at 4K for miles. I can pull back the throttle and ride at whatever rpm that I want at that...
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    1988 350 Stumble Problem

    I was thinking it could have something to do with the ignition coil. I bought a new coil but forgot to bring it with me to the water so I couldn’t switch it out on the fly. I will check fuel pressure and coil this weekend.
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    1988 350 Stumble Problem

    Hi guys, I have a 1988 350 Merc with the QJet and points ignition. I am having trouble getting above 2500rpm under load. Hard to believe, but it is intermittent. It has a rebuilt carburetor and the gas tank has just been thoroughly cleaned. The fuel lines, pump, lines, separator, and filter are...
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    Merc 5.7 Q Jet fueling issues

    Thanks for the reply. I’m going to check the antisiphon and the vent hose today. It tends to spray fuel out the filler neck when filling up so I’m optimistic that those two may be a problem.
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    Merc 5.7 Q Jet fueling issues

    Hey guys, I’ve been having an issue with my boat where it will start and run fine, and I can run about for a while at throttle but after a short time on the gas, it’ll bog out and die as if it is out of fuel. After that I can only idle with the choke pinned closed for a bit before opening it...
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    OMC Cobra Hard to Throttle

    Thanks for the reply. I validated all cables already and plan to pull the control box after work today to see what is going on in there. I can shift my boat into gear with the engine running by disconnecting the upper cable and turning the lever by the carburetor so that’s a good sign.
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    OMC Cobra Hard to Throttle

    It is genuine.
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    OMC Cobra Hard to Throttle

    My OMC 5.7 seems to be having shifter/throttle lever problems. It seems to shift into forward and reverse just fine but once I’m past forward engagement, the throttle is very hard to push. I can throttle up and down just fine if I pull the shifter out in neutral before doing it. I also can...
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