Re: 75 CB750 wont idle with rebuilt carbs & no airbox
Posted by
TOOLS1 on
Apr 23, 2014; 3:26am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/75-CB750-wont-idle-with-rebuilt-carbs-no-airbox-tp4025625p4050380.html
First I would make sure that the accelerator pump is working. You should see gas being squirted from the four nozzles at the rear of the carbs. Then I would start with a 120 main, and drill the pilot out to 0.45mm. That should get you close. You might need to shim the needle, there is a thread here by Lucky1 that shows how to shim them. You can shim up to 1.5mm but after that you would need adjustable needles out of a 77K, or F carb. Also all the A models used the same needle, and are adjustable. Also you should start your own build thread. It would be more organized, and easier to answer questions pertaining to your project.
TOOLS
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
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