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Carburetor Information
U.S. CB750 Models 1969-1978
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Boring 77-78 carb pilot jets for pods and open headers - Pg 4
Place the bit in the bubbler tube and with just the slightest pressure genty start twisting and the bit will lead itself into the bore on it's own. USE BOTH HANDS AS SHOWN AND STEADY YOUR HANDS WITH THE EDGE OF THE BENCH! Take your time!!! I can't stress this enough. Pushing the bit in too hard or twisitng too fast can break the bit off in the jet and the game is over. It AIN'T coming out then! The bit will pull itself through on it's own and soon will go all the way in with no resistance. Keep twisting as you pull the bit back out, blow off any debris on the bit, and gently run it back in then out again to be sure no burrs are left behind. Simply repeat the process until all the jets have been bored.
Use an air pistol to clear any debris left behind and be sure to inspect them closely when you've taken them loose. ANY debris left behind could clog the passage in the carb and that can be a pain in the rear to clean out. Those brass alloy shavings are stubborn.
They're ready to go back in the carbs. Remember your low mixture is going to be richer now so set the bleed screws to the stock number of starting turns and then adjust from there. That's it, you're done.

Houndog750

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