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    1988 Johnson 90 hp V4 carb has no suction top carb

    What? The piston is an air pump. It drawing air in through the reeds and on the down stroke air goes out the exhaust.
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    1988 Johnson 90 hp V4 carb has no suction top carb

    At first, on muffs, the engine would start up and sometimes run away. I couldn’t shut the key off to stop the engine. I noticed that the voltage regulator wasn’t working and replaced it. The engine doesn’t run away anymore but only runs at high idle. Even at 3000 RPMs there’s no suction on...
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    1988 Johnson 90 hp V4 carb has no suction top carb

    If there’s an air leak in the lower half wouldn’t it affect the lower carb and not the upper?
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    1988 Johnson 90 hp V4 carb has no suction top carb

    Wouldn’t there be signs of oil under flywheel? Or are you talking between cylinders? Would the middle sealing ring affect both carbs?
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    1988 Johnson 90 hp V4 carb has no suction top carb

    with good compression. What would make it dead?
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    1988 Johnson 90 hp V4 carb has no suction top carb

    How do you determine that?
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    1988 Johnson 90 hp V4 carb has no suction top carb

    shouldn’t matter. yes. Throttle plates open. That shouldn’t matter, I should feel a suction with throttle plates closed. There’s no signs of oil under the flywheel. I assume the seal is fine.
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    1988 Johnson 90 hp V4 carb has no suction top carb

    Anyone have an idea why if I put my hand over the top carb while running there's no movement. It's not sucking any air. Feels completely dead. Bottom carb plenty of suction. There's really good compression in all 4 cylinders. Reeds looked good. Don't get it.
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