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post #46 of Old 07-16-2013
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Join Date: Oct 2010
Location: Edmonton, AB
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Re: Tohatsu troubles

Having 2009 Tohatsu 9.8hp for the last 4 seasons, the only real problem I came across is the upper cylinder having tendency to flood, which subsequently fairly quickly tends to foul the spark plug - I always carry two new with me (they get changed each season regardless of condition). The engine (my experience) does not like any other plugs than the NGK. I have tried once Champion equivalent and Bosch (I was told these were equivalents), and run into a lot of uneven idle, hesitation and poor performance. Do very carefully gap the plugs to specifications - failure (again, my experience) caused poor operation and misfire. I change fuel filter after each season and add fuel stabiliser to the last tank of fuel of the season. I have disassembled carburetor this spring and found it in surprisingly clean condition - bottom line is the fuel quality. Besides that, the motor so far is rock-solid and my fuel usage is about 1.2-1.5l/hr at about 60% throttle.
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