Carburetor Specifications U

Carburetor Information
U.S. CB750 Models 1969-1978
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A Collection of tips and walkthroughs for everyone's FAVORITE part of the bike: The Carbs

Carb Tuning: Everyone's favorite chore! (Click here for Adobe PDF version)
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Setting Float Levels: Really not much to is save for going at it from the "right angle". (Click here for Adobe PDF version)
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Bench Synchronication: Mystery solved. Not as hard as you'd think. (Click here for Adobe PDF version)
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Bowl vent/tube diagrams: Diagrams showing the bowl vents, gang tubes, and passages. (Click here for Adobe PDF version)
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WTF is a Plug Chop???: The ONLY way to tell where your fuel to air ratio is at a given RPM. An indespensable part of tuining and jetting carbs to aftermarket rigs. (Click here for Adobe PDF version)
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Carb Buying Tips: What to look for, watch out for, and run away from. (Click here for Adobe PDF version)
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NOTE: The following three "tweaks" are to be attempted at your own risk and are intended for those more familiar with their machines.
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Idle Screw Modification: Plugging the aftermarket idle screws to find that sweet spot between smooth rolloff and that steady even loping idle. (Click here for Adobe PDF version)
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Boring the 77/78 Pilot Jets: Step by step on how to fatten up that annoyingly lean bottom end of the 77/78 PD series carbs that everyone loves to hate so much. (Click here for Adobe PDF version)
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Repairing the 77/78 Accelerator Pump Valves: Those pesky clogged check valves conquered. (Click here for Adobe PDF version)
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Note: Static and strobe timing is also included here as this is absolutely necessary along with proper valve adjustment when tuning and jetting carbs. Poor timing or valve leak can mimic fuel ratio problems that can't be corrected with carb tuining or jetting. Other hinderances would be poor compression or electrical problems in the ignition circuit and would have to be addressed as well. (Click here for Adobe PDF version)

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