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Hi,
I have a 1988 Yamaha 150 ETLG that will throttle up and plane just fine. However, when I usually hit about 40 RPM the motor will immediately cut down to about 31 RPM. I have checked all fuel possibilities, changing out the fuel filter, fuel pump, deep cleaning of the carbs (replacing all gaskets) and checked for any type of air leaks. I have changed out all 6 spark plugs. I had a buddy actually squeeze the pump while running it full out and when he stopped pumping it the motor immediately shot back up to 41 RPM. I pulled the plugs again to see if all were firing and found that I had fuel in / on plugs 1, 2, and 6. You could defiantly tell that they were not firing due to the amount of fuel still on the plugs and inside of the threads. There was "A LOT" of fuel in the water when I shut it down and went to idle from the prop casing. The motor when idling sounds very rough but when I throttle up on the idle it quits but immediately starts to smoke pretty bad. Would this be case of needing 3 new fuel ignitions? or would it be the case of getting new spark plugs and making sure the gap is correct. Any and all help would be greatly appreciated!!! Thanks John (grimsleyjk@yahoo.com)
I have a 1988 Yamaha 150 ETLG that will throttle up and plane just fine. However, when I usually hit about 40 RPM the motor will immediately cut down to about 31 RPM. I have checked all fuel possibilities, changing out the fuel filter, fuel pump, deep cleaning of the carbs (replacing all gaskets) and checked for any type of air leaks. I have changed out all 6 spark plugs. I had a buddy actually squeeze the pump while running it full out and when he stopped pumping it the motor immediately shot back up to 41 RPM. I pulled the plugs again to see if all were firing and found that I had fuel in / on plugs 1, 2, and 6. You could defiantly tell that they were not firing due to the amount of fuel still on the plugs and inside of the threads. There was "A LOT" of fuel in the water when I shut it down and went to idle from the prop casing. The motor when idling sounds very rough but when I throttle up on the idle it quits but immediately starts to smoke pretty bad. Would this be case of needing 3 new fuel ignitions? or would it be the case of getting new spark plugs and making sure the gap is correct. Any and all help would be greatly appreciated!!! Thanks John (grimsleyjk@yahoo.com)
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