SOHC.co.uk Forums > CB500/550

CB550K3 carb needles ???

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OZZYSBIKES:
Got the carbs back on the bike with the shorter needles fitted, it runs better than ever but that is only with it running in neutral, I will feel better when I can take it for a spin and test it under some load,

It appears that the new longer needles are the wrong ones for my 550K3 carbs.

kevski:
I know the carbs can be a problem on these, but my 500k3 had them on and the only time i had running issues was when i had the bike serviced at a local dealership, it came back running terrible, i bought a Morgan carb-tune stripped, cleaned and set them up myself and never had any problems there after, but the bike was run everyday in all weathers, i think you have to keep them running all year as the modern fuels do no favours.

matthewmosse:
When I had a cb550k3 as a daily use bike it didn't mind being left standing the 6 months between me buying it and passing my test, or the odd layover once I got a cb500/4 sidecar. I did appreciate the better fuel economy and the only running issues I had with the bike were attributable to the absolutely appalling engine condition. I did try switching some k3 carbs and engine to my 500/4 many years later, with k&n cone style filters and later the stock filter setup but by then something wasn't playing ball. Not sure if it was the same bank of carbs as I have a few sets kicking around. Depends what you want from the bike, I liked the extra mpg and tank range. I think I was still running the k3 though into the era of modern fuel.

OZZYSBIKES:
Well I decided to get a holdall strapped to the bike so that I could do the food shopping on it, well ! I am delighted, it's running perfectly now, just need to make my mind up whether to fit modified CB750 pistons or buy the cruzin image big bore kit, I definitely want to give it a little bit more power and already have two CB650 camshaft, I am looking forward to rebuilding the engine ready for the late summer or autumn ride outs

Richie 550/4:
Hi.

Sorry to break the subject matter.

Can you tell me where you are finding your serial numbers on your Kei Hin carbs please?

I am currently renovating my bank and the only number I can find is 069A

Everything I have read and heard you guys discussing are numbers with a letter prefix.

Any help greatly appreciated.

Richard

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