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  1. J

    4Cyl 2Strk lower cylinder won’t fire. Has spark but low compression.

  2. J

    4Cyl 2Strk lower cylinder won’t fire. Has spark but low compression.

    Yes it has a tach with 3 lights. The tank(s) was/were removed but the harness to the tack is still present in the motor and wiring is still connected at the other end.
  3. J

    4Cyl 2Strk lower cylinder won’t fire. Has spark but low compression.

    Thanks for replying. It’s a 1986. I removed main oil tank and oil pump and sending unit and switched over to running a premix. I’m thinking I might have two issues. One is, the sensor is telling the motor not to rev above 2500 RPM and the second one is low compression in the number four...
  4. J

    4Cyl 2Strk lower cylinder won’t fire. Has spark but low compression.

    Thanks for the responses! This is all very helpful. On the “Precision Blend” motors (where the oil is injected into the motor just after the carbs and before the venturi’s), there is a control feature that keeps the motor from running too fast if there is a problem with the oil pump or oil...
  5. J

    4Cyl 2Strk lower cylinder won’t fire. Has spark but low compression.

    That cylinder’s spark plug comes out wet. On the “Precision Blend” motors (where the oil is injected into the motor just after the carbs and before the venturi’s), there is a control feature that keeps the motor from running too fast if there is a problem with the oil pump or oil sending unit. I...
  6. J

    4Cyl 2Strk lower cylinder won’t fire. Has spark but low compression.

    My 30 year old Yamaha 115 two stroke has one cylinder that doesn’t fire. If I pull that spark plug wire nothing changes but there is plenty of spark. The compression is 120/120/120/100. The carburetors have been cleaned and rebuilt and in the Venturi valves nothing seemed amiss. I switched...
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