I think you need to remove the carbs and clean them. Don't separate each carb from the rack, but remove from the bike and clean thoroughly. Do this before trying to fine tune or whatever else. 53k is a lot of miles on an 80s Nighthawk. I would check compression as well. Low compression on the 550 will contribute to poor idle.
Sent from my iPad > On Feb 27, 2015, at 13:26, Brandyn Beck <[email protected]> wrote: > > Hello everyone. first time poster here. I just picked up this 83 cb550sc a > good week or so ago. She has about 53k miles on her and is my first bike. I > had a no start condition at first, and an oil and gas leak, which has all > been taken care of through KISS and working my way through my Clymers. I had > a few questions that I believe to be specific to the bike so I can finish > getting her road worthy. The throttle slides (diaphragms?) on cylinders 1 and > 4 actuate with the use of the throttle, but 2 and 3 do not, is this something > that is working as intended? Somebody told me that on these carbs 2 and 3 do > not actuate until more load is on the bike, I.E. at higher speeds. The other > thing is she doesn't like to idle really well, which Im sure has a lot to do > with fine tuning the pilot screws (which is on my list as soon as my float > boal gaskets arrive from ebay) but its particularly troublesome with the > ticks and sputteryness that comes out of the bike around 1000-1100 RPM when > thats about what the idle should be. Is that something that clears up when > the fuel/air mix is proper? Thanks for your responses guys! It's awesome I > stumbled onto this place! > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/nighthawk_lovers. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
