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Yamaha 70 hp 4 stroke with curious habit

Ben Taylor

New member
The machine starts right up but drops a cylinder on acceleration. After 10-15 minutes of running on two cylinders the third cylinder gradually starts to kick in and then the machine will run fine for the rest of the trip down the river. After a cool-down at the destination, the machine will restart and drop the cylinder for a short while then quickly straightens up and run right for the run up the river. What the....
 
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