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In many case when you rejet your carburetors you are only changing the mains and the needles(to get rid of the acceleration bog) If they give you several size jets to try, be sure you are putting the right sizes in the right spots. Yamaha typically will run one carburetor leaner than the other. Depending on how the cycle is running , I have known people to match the jets in both carburetors. Check the color of your plugs to double check if you have set the cycle up correctly.
My experience with this is limited. The fix then was to rejet the carb and remove the blue with special stuff they happened to sell in the parts department. The trouble was, as was explained to me by the mechanic servicing my 1973 Honda 350, too much heat because of too much fuel going through the carb.
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