Re: 1978 cb750 carb swap

Posted by Lucky 1 on Apr 22, 2012; 6:39pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1978-cb750-carb-swap-tp3911046p3930468.html

Thanks for your efforts Shultz!!!

Brass shim .031

And you said it was accelerating smoothly? Right?

So if the shim is .031 thousands  AND it fits under the clip on the needle, AND it sits down in the pocket like the needle clip does, it is raising up the needle .031 thousandths. No need to add the pocket depth.

The needle is being raised up .031 thousandths. Makes sense. I know .044 thousandths was too rich.

What is interesting to me is that those exhaust pipes are form the 70's too and I knew someone had fiqured all of this out but the information got lost.

So when you get your carbs back on and you know the accelerator pump system and spray nozzles work
please tell us that it runs perfect.


To check those nozzles on the bench, make sure the float bowls are full of gas (carbs level) and flip the throttle a couple times, and make sure all 4 brass nozzles sticking up are squirting fuel.