SOHC.co.uk Forums > CB500/550

Pilot Screws

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Dave M:
Hi again.

Which way do the pilot screws on the carbs on my 550 work?

Is it screw in to richen or screw out?

The manual isn't clear.

Thanks.

dave400:
Dave,  I dont know bugger all about your 550 carbs but this may help....  It depends on the position of the screw on the carb body so if it

SteveD CB500K0:
Dave, Dave is correct....

If they are on the engine side of the carb then turning in leans the mixture
If they are on the airbox side of the carbs then turning out leans the mixture

I have a set of 069As (CB550F) in my garage and the screw is on the airbox side.
I've also a set of 627Bs (CB500)  and they're the same.

Dave M:
Cheers guys.

I get a bit of stuttering if I open the throttle from idle and also when opening it from a small throttle opening which makes me think it's a bit weak on the idle circuit.

I really need to remove them and clean them but that's a winter's night job.

I just want to ride it at the moment so I'll have a play and se what I can do.

Dave M:
Bit of a result!

Mr Haynes says that the pilot screws should be 1 3/4 turns out + or - a 1/2 turn so, thinking it was running rich I screwed them in by 1/4 turn and tried it. Not happy.

Tried another 1/4 turn and even worse!

Backed them out again and then out  a further 1/4 turn. Better. Another 1/8 turn, better again so I've gone out the extra 1/2 turn and the difference is marked.

It idles fine and now it doesn't bog down when I set off and accelerates cleanly.

Still a bit hesitant when opening up from a small throttle on the move but again much better.

I'll try it for a while and might risk another 1/8th or a quarter. Can always turn it back.

Thanks for your help.

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