Help: Boat cuts off at low RPMs

[Brian L]

You guys all using the Star Brite fuel additive for the Ethanol fuel?

My 70HP Johnson was stalling out later in the day at low rpm's as well. Went to the Star Brite Enzyme fuel additive and engine has run great all year.

[freebie]

you probably need to clean and adjust your carbs, those older yamaha's can be touchy on the low speed adjustment, just did a set the other day, check the small jets in the bowl, I usually blow them out, run some thin mechanics wire through them then spray crc using the red tube through to make sure they are clear

[TheSpecialist]

My buddy had the same problem, and it was water in the fuel. Like others have said, clean the bowls on the carb, get some fresh gas after you empty out your tank, and use an additive. I have been using the Evinrude/Johnson fuel conditioner since day 1 with ethanol 4 years ago and so far no problems.