How to Reset a Carburetor on a 2008 Honda 750C2 Shadow
It's no secret that Mikuni made its name building licensed copies of the French Solex carburetor, or that the company has maintained the same basic side-draft design for more than 50 years. But the modern Mikuni carburetor, as used on Honda's Shadow-series motorcycle, is a far more advanced offering than its predecessors. But, like all multiple-carb bikes before it, working on a single carb means re-synchronizing the carbs afterward. Fortunately, the procedure is fairly straightforward, and quick once you know what you're doing.
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Instructions
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1
Remove the bike's seat to access the carburetor airbox beneath. Remove the airbox to access the front of the carburetors. Be very careful not to damage the airbox seals; the bike won't run right afterward without a well-sealed airbox.
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2
Turn the primary throttle-linkage lever that connects all of the carburetors together. You'll need to open all of the carb butterfly valves before attempting to reset them. If you've had one carburetor disconnected and can't open the valve with the primary throttle linkage, then skip to step four.
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3
Loosen the lock-nuts on the carburetor bodies. The lock-nut serves to keep the synchronizer adjustment screws in place. Loosening the lock-nut on the screws allows you to turn them to open or close, for the individual carb throttle plates. If you have one carb so far out of sync that it won't open with the main linkage, proceed to the next step.
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4
Insert one length of six-inch-long wire into the carb bores, so that the wire keeps the throttle blades slightly open by wedging between the throttle blade and the carb bore. A few pieces of metal clothes-hanger wire will work; it doesn't matter how thick the wire is, as long as all the wire lengths are the same thickness.
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5
Feel the wire lengths to see which one is wedged the tightest in the carb bore. Hold the lock-nut on that carb with your wrench, and turn the adjustment screw counter-clockwise to open the butterfly valve. As this valve opens, the next-tightest will clamp down on its wire and wedge it against the carb bore.
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6
Proceed in this manner with the next two carburetors, loosening or tightening the adjustment screws as need be until all the throttle plates exert the same amount of pressure on the calibration wires. Once you have the plates adjusted and reset, tighten each lock-nut while holding that adjustment screw still with your screwdriver. Tighten the lock-nuts to lock in your adjustment.
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7
Pull the wires out, and turn the primary linkage to ensure that all the carbs are working together and closing against the bores. Reinstall the airbox, and, again, make sure that it seals tightly. Put the seat back on, and enjoy your newly reset carbs and fine-running ride.
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