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4 stroke 40hp Merc cuts out when accelerating

openorice

By openorice
in Boats & Motors.

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openorice Contributor

openorice

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I have a 2001 40hp 4 stroke Merc tiller and it cuts out when I start turning the throttle to go from idle to full throttle. If I twist the throttle back and forth I can keep it from stalling out as it increases to full speed. I've had it worked a number of times and nobody can seem to fix the problem. Any ideas?

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GRA Contributor

GRA

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I had this problem with a 30 hp. Yamaha 2 stroke. Started out with a motor that would only run with the choke on. I had the carbs off and cleaned them. Motor would then start and run good except for the accelerating part. Went and asked a mechanic and he said I must have missed a hole or passage when I cleaned the carbs. Took carbs off, cleaned again, and must have found the pluuged spot because motor worked just fine after that.

Mechanic said gas today is [PoorWordUsage].

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