Join Date: Jul 2007
Location: Truckee, CA
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Re: 9.8HP Tohatsu 2-stroke odd behaviour
I'm going to place a nickle bet on the mixture as well.
While it's admittedly a bit of witchcraft and not the same as pulling things apart, I do use this annually. I think it does a reasonably good job of keeping things clean, albeit cheating. You spray the entire can down the air intake, while running. It nearly chokes the motor to a stop, so you let up and then go at it again. Big smoke maker, makes you feel like you are doing something.
Amazon.com: Marine Motor De-Carb 12 oz. aerosol: Sports & Outdoors
I have used this for over 30 years in anything that burns gas, and have not had any fuel related problems, except one time when I forgot to drain the carb on an outboard put away for the winter, my fault. I change the gas, treated with it, once a year in my generator, which runs fine.
Fuel Additives / Treatments | Berryman Products