SOHC.co.uk Forums > CB500/550
Cb 550 ss spain
Bryanj:
Needles originalyin centre groove but oce youalter induction orexhaust all bets are off
murdock:
OK THANKS IN THE MIDDLE OF THE 5 NOTCHES
I DON'T KNOW WHAT IT MEANS (but you change the induction or exhaust all bets are off.) Sorry we don't speak the same language
murdock:
I think you ask me if I change the air inlet, I will replace once and for all what ever the motorcycle had the original air box with all its components except the rubber nozzle that goes under the seat, since I have changed for a flatter seat and it does not fit, I have exhausted my passience with the individual filters, more or less it worked, but, after rebuilding the engine and tuning the ignition, it no longer works well
Bryanj:
It means thatonce you start altringthe inlet or exhaust nobody has any idea of what to do
deltarider:
If we're talking the CB550F model, there will be no middle position for the jet needle, as there are only 4 positions in total. According to the original Shop Manual Honda CB500-550 p.165*, needle clip needs to be 2nd from top. Caution: top is top and not tip. When you lower the clip on the needle, the needle's position will rise and vice versa. Main jet is #98, slow jet #38 and airscrews are supposed to be 11/2 turn out +/- 1/2 turn. This is with genuine Keihin parts in 069A carbs.
Note that jet needles and airscrews differ from those applied in CB500/550K models. The F models had solid airscrews, the K models were open ended and cross drilled. The jet needle of the F models is tapered differently than the needle in the K models. For part numbers, you may consult the PDF below.
* https://www.dropbox.com/s/88zdzlj8olqi8pl/Honda%20CB500_CB550
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