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1988 Mercury 70 hp 3 cylinder bogging down
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<blockquote data-quote="JL8Jeff" data-source="post: 383369" data-attributes="member: 12995"><p>Was it the bottom cylinder that was burned? If you tilt the motor up, sometimes the fuel/oil in the carbs can run out into the air cleaner box and then get recirculated or pulled into the bottom carb/cylinder. I had a 90's 90 hp Mercury and I had to do some adjustments to get all the carbs/timing set up right so you could be out of adjustment. Seems weird if it just ran fine all day but I've noticed the last couple of years this lousy gas will take out fuel pump diaphragms a lot faster. I lost 2 fuel pumps in the same 99 Johnson 40 hp in less than 5 years so don't rule that out.</p></blockquote><p></p>
[QUOTE="JL8Jeff, post: 383369, member: 12995"] Was it the bottom cylinder that was burned? If you tilt the motor up, sometimes the fuel/oil in the carbs can run out into the air cleaner box and then get recirculated or pulled into the bottom carb/cylinder. I had a 90's 90 hp Mercury and I had to do some adjustments to get all the carbs/timing set up right so you could be out of adjustment. Seems weird if it just ran fine all day but I've noticed the last couple of years this lousy gas will take out fuel pump diaphragms a lot faster. I lost 2 fuel pumps in the same 99 Johnson 40 hp in less than 5 years so don't rule that out. [/QUOTE]
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1988 Mercury 70 hp 3 cylinder bogging down
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