Heres a tip on checking float level.
If it's high there will be short time when the bike runs well with the petcock off before it dies.
If it's low the it will die at off throttle after a full throttle run because the main uses the fuel the higher idle jet needs.
If it runs ok when it's cold it's rich.
You should also check petcock flow and tank vent.If the flow cant keep the bowl full there will be a short time after full throttle the bowl will be low.
Help with carbs on 1967 CB77
Good tips there. If I understood the symptoms, it runs OK up high, but it's the idle and just off idle that's a major problem.
CB77 is rather cold blooded anyway, but that 3/4 turn on the air screw seems to point to the pilot circuit. Back to that last post, if the float level is too low, that could make the slow running slightly leaner I suppose. Fortunately, that's easy to check. Raise the fuel level (ie the floats measurement will be smaller than stock). Hold on a minute. Did you check the float height with the float tang just kissing the float needle, or were the carbs upside down like that illustration? If the floats were resting on the float needle, the fuel level will be low. The best way is to tilt the carbs back until the floats just start to press against the spring in the float valve and measure it.
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