SOHC.co.uk Forums > CB500/550
idle jet differences , 069's
deltarider:
Can you show us where that was denied? It's my habit to post all information thus that it can be falsified by anyone. So far I have not received additions/corrections concerning the carbs. overview, nor the method for verifying fuel levels. I'm always open to it and will be happy to add or correct anything when needed.
fogrider:
My idle screws look as old as the carbs so I assume they have'nt been changed. It ticks over fine too so it looks like the solid ones are correct.
Have done the clear tube fuel level already, between 3 and 4 mm so possibly OK. Like your drain down quantities check idea, cup of tea and next job !
I can't find any reference to what cutaway these slides are, I'm sure a smaller cutaway will cure it, but what's the original ?
Regards all, Terry.
K2-K6:
As already mentioned, they can be quite cold blooded from that period as they started to grapple with emmisions focus that was more related to fuel supplies and oil prices etc.
Where have you got the airscrew set? It can be beneficial to go a more little toward rich than what you'd consider ideal. It brings the idle circuit up sooner as you lift the slides and may just be enough to encourage more smooth transition. Worthwhile to do a comparison.
K2-K6:
"I can't find any reference to what cutaway these slides are, I'm sure a smaller cutaway will cure it, but what's the original ?"
As far as I'm aware there's no alternative slide cut available, but agree it would be something the could clean this area up by inducing raised initial vacuum just as you open the throttle.
One way of moving it slightly that way would be to go one size (smallest step) up on idle jet, then you'd have to run with the airscrew further out to stop tickover being too rich but get quicker ramp up in volume as you start opening the slide. Potentially the opposite side round the same square to changing slide cut.
Something they appear sensitive to also, some markets had different airbox cover I believe that affect carburation and so worth checking for oddity there.
fogrider:
Thanks for that latest, I have tried a richer idle setting and it did make a small difference, at least it demonstrated that that is where the issue lies.
I have thought about turning a half mill off the bottom of the slides then packing the needle up the same . It's a no going back step !
Dare I do it ?
Must price some slides up to see if it's worth a gamble.
By the way , I tried Deltariders fuel drain check, 50cc per bowl result. Looks like fuel levels are OK.
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