SOHC.co.uk Forums > CB500/550
idle jet differences , 069's
K2-K6:
I'd look at the slide question like this;- effectively you're trying to increase the vacuum at lower slide position to pull more fuel through the existing idle jet specification, balanced by the air jet for mitigation.
And so, if you increase the idle jet size, then the same (existing vacuum) pulls against less resistance in drawing fuel up from float bowl, again mitigated by the air screw setting. In essence the same or close to it as changing the slide, but reversible ultimately.
In addition, if you drop the needle one notch this too would subtract fuel that the idle circuit adds higher up the range. Ultimately it should "fatten" just the transient above idle response while leaving the rest alone, which is what it appears to need.
Bryanj:
Dont think ive ever seen slides for sale
fogrider:
CMSL list them, 73.5 eur each plus plus. They list USA and UK , same part number . Not shown at Silvers.
Looking at ebay, there are Keihin slides quite cheap in the USA, but the adverts don't make it clear exactly what they fit. There is a choice of cutaway though, which looks promising.
Work in progress, someone somewhere has some, but I'm determined to try a smaller cutaway. I'm sure it's the answer to this seemingly common problem. !
deltarider:
Before you undertake drastic measures, could you inform us some more like on air intake? Pics are welcome. I think it's odd you need full choke at first and then, when warmed up, engine bogs down. IMO something is not standard. Are you sure brassware is original, that the little O-rings around main jets are still OK and seal well? Is airfilter element OK or has it been wet?
Bryanj:
You say cmmn problem but not one ive come accross ona factory standard bike
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