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Old 07-10-2018, 03:01 PM
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2 dead engines in 1 week

My son commutes to work by boat. Coming into work, his Yamaha 15 HP outboard quit. We could get it to run at full throttle, but it dies at part throttle. Took that engine home and put the 6 HP Johnson on. A few days later that one died too
The 6 HP has 30 PSI compression on one cylinder and 50 on the other. That may have something to do with it, it probably blew the head gasket between the two cylinders.
The Yamaha was not improved by two carb cleanings and a new fuel filter. I gave up on that one, it is at the dealer now. Obviously there is some part of the carb I am not getting to or a real oddball issue and I am out of time to mess with it. Taking the head off the Johnson soon to see about the gasket. That may not be too hard of a fix.
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