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Hi all and thanks for the previous responses. I have rebuilt the carbs with rebuild kits and replaced all the air cut off diaphragms etc. Great results - bike starts first time on the button, really strong power (noticably better than before) and no banging / popping on the overrun. Much Better...

Yes I will rebuild with new parts. I changed the air cut off last year and it made a big difference on the overrun - less popping / banging. My issue is very poor cold start. Will clean, rebuild and sort this choke mechanism and see if it improves things.

Thanks for the response Pwnypower. Can't get ethanol free fuel in the UK, at least not easliy. Will consider using additive. As an update, with help from amc49 I got a rebuild manual for the carbs and discovered that when closing the choke it should act on a seperate lever to open the throttle...

Hi there, does anyone have a source for a detailed parts diagram for the carbs fitted to my 1980 Japanese market Cb750c. They are marked VB52 There are some parts missing from carb 2

Thansk for getting back amc49. Yes we have ethanol too. Will go back through everything again. Cheers Johnw

Hi, my 1980 750c does not have an accelerator pump fitted to no. 2 carb and I have read on other threads that the European models did not have them fitted. It is really hard to start from cold and has been since I bought it last year. The choke mechanism is working OK and following previous...

Hi Pete, great collection. I have a 1980 CB750c which I am working on. I want to add megaphone style silencer / muffler as you have on the 2 Hondas. Can you tell me the manufacturer or any other details you have? Much appreciated. Kato.

Thanks amc49. Been reading through the forums and see input from you often. Thanks for keeping the knowledge flowing. Next task for me is the valve clearances as you have recommended many times, so your threads have been helpful! Kato

Hi, did you get an answer to this? I have just cleaned out my carbs and have the same fitting with a tube that just seemed to sit under the tank but not connect to anything? Is it a breather of some sort? Kato