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I’ve been digging for a bit more info on this motor. What I’ve been able to find out is it was made from 1979-1985. It is referred to amongst some as the “gnat”. This thing doesn’t at all look like something Mercury designed and I suspect it was made for Mercury in Japan, or maybe China. The words “Mikuni Japan” are cast into the carb body. The recoil assembly looks like it belongs on a lawn mower. Propeller is plastic.
I’ve found a lot of new Mikuni carbs for sale online for $25 to $35, but not for this motor. Some of the carbs for other small engines and dirt bikes look similar but not close enough to use and not with the type of choke this 3.6 Mercury has. If I could buy a new carb for around $30, I wouldn’t mess with the old one anymore!
Per my first post, any info on the sticking choke assembly, and the float height adjustment would be greatly appreciated. If no float info is available I can probably adjust that with an educated guess.
Dave