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BROKEN REED
it’s any interest, I had the same experience several years back with my 1963 Big Twin Evinrude. I was cruising home one day when all of a sudden I lost power and felt that the motor had lost a cylinder. I stopped the motor and established that there was spark on both cylinders. I started up again and continued back to the ramp.When I got home I had a closer look at the plugs and noticed that one appeared to have some minor damage to the electrodes. I then put a light down in the cylinder and noticed what appeared to be a piece of metal embedded in the piston crown. I managed to remove it with surgical forceps and recognized it as part of an inlet reed. Needless to say I removed the cylinder head to check for any other damage and found all OK. A new reed and I was back on the water.
Cheers
MonteNZ