Question about 1985 Yamaha XJ 700 S Maxim

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85 xj700 runs rich, terrible mileage, and "bogs

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I had this same problem, and it happened to be a vacuum hose for the gas tank had come off. Once I re-attached it and put a hose clamp on it so it wouldn't fall off the engine ran like a champ.

Posted on Mar 02, 2012

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Is there an air fuel mixture adjustment screw? I'd try lookin for one and adjust it a little and see what happens. Sounds like your mixture is way too rich. A more lean mixture won't bog down, but too lean of a mixture will bring your idle speed up too high

Posted on May 28, 2011

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I believe it's in the middle, or out of five, third one down.
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Kx 85 04,bike had a slight bog when throttle was gassed then i cleaned the carb,now it really bogs and running very rich.i also messed with the air & idle screws hoping i could fix the problem &...


Start with setting the air and throttle screws. Turn each one inward until it GENTLY seats. Back each one out one and one half turns. Clean the air filter and starter plunger. The plunger may need to be rebuilt or replaced. Check the pilot and main jet sizes. There will be a number stamped on the side of the jets. The pilot jet should be #45, the main jet should be #140.

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