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Thread: 1991 2 stroke 2 cylinder Mariner

  1. 10-06-2024, 09:07 AM #1
    raporter
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    Unhappy 1991 2 stroke 2 cylinder Mariner


    Motor starts and runs good at low speed but dies when trying to go faster than 5 mph. Any clue what to do? TIA
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  2. 10-06-2024, 09:17 AM #2
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    Barnacle Bill
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    Possible bad switchbox. Check for good spark at both plugs.
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va
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  3. 10-06-2024, 11:08 AM #3
    raporter
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    Will check the spark at the plugs, how do I check the switch? TIA
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  4. 10-06-2024, 01:44 PM #4
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    Quote Originally Posted by raporter View Post
    Will check the spark at the plugs, how do I check the switch? TIA
    You are checking it when you check for spark. If you are missing spark at one plug the switchbox will need to be replaced. It can't be repaired.
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    Chesapeake, Va

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  5. 10-09-2024, 08:14 AM #5
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    If it full on dies, I would think it probably means its fuel delivery issue rather than ignition.
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  6. 10-09-2024, 12:55 PM #6
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    Quote Originally Posted by scout-j-m View Post
    If it full on dies, I would think it probably means its fuel delivery issue rather than ignition.
    Yes it could be a fuel problem but that motor (made by Merc) is notorious for the switchbox causing that.
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    Bill H. PTC USN Ret
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  7. 09-25-2025, 08:15 PM #7
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    You should check the compression
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  8. 10-08-2025, 09:30 AM #8
    TheGrandPoohBah
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    Quote Originally Posted by raporter View Post
    Motor starts and runs good at low speed but dies when trying to go faster than 5 mph. Any clue what to do? TIA
    Don't go over 4 mph.
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  9. 11-01-2025, 11:37 AM #9
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    Easy way to check , launch boat, try to take off then when it boggs apply the choke, if the motor picks up it's fuel related, plugged high speed jet, if it dies it's electrical, switch box
    Tom

    "The reason I play Golf.....there are no broke down boats on a Golf Course"
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