Sorry, I didn't google before posting. All the pics online show slide carbs. So Ignore any suggestions on needle adjustment. but you absolutely need to pull that screw out of the #4 and squirt some cleaner an compressed air up there, hopefully the tip isn't snapped off in the carb body. It took 3 sets of carbs just to get one semi good rack for my GS they used Mikuni carbs that look just like those in the online pictures.
On Fri, Nov 6, 2015 at 11:55 AM, Allen Thomas <[email protected]> wrote: > I'd say that is a idle mixture screw. If you didn't remove them for > cleaning and replace the o-rings under the spring an washer then you didn't > do a through cleaning and I expect that until you do it will run lean or > not at all on any given cylinder. Sorry for the bad news. Can you take a > picture of the Carb rack so I can see which version carbs you have. The > look like the aluminum slide CV carbs, based on that pick of the float > bowl. Do they have an actual choke plate in the carb throat? You could try > and turn that screw out some on the #4 to see if you can get it to fire. I > those carbs are the ones I'm thinking they are then around 1.5 - 2 turns > out from bottom is the range you want to be in. > > On Fri, Nov 6, 2015 at 10:57 AM, EGrider <[email protected]> wrote: > >> Working on my 1978 CB550K. Let's call it a "70's Nighthawk." One carb >> was dumping gas all over the tranny as soon as I turned on the petcock, so >> I pulled the carbs and pulled a piece of rubber out that was blocking the >> needle valve. Problem solved. >> >> While off, I noticed a setting on the bottom of each carb. I looked in >> the shop manual, but I don't see anything about it, and the scans of the >> pictures are so bad I can't really make much out. >> >> I'm attaching a picture. Can anybody tell me what that setting is? >> Mixture screw? (Graham, you're my prime candidate.) >> >> Carbs back on, bike starts up, but #4 is cold. Cylinder has spark, and #1 >> is firing normally. Filled bowls (still on bike) with Sea Foam for 24 hrs. >> No change. >> >> What is my next course of action? Pull carbs again (that was a PITA) and >> soak carb #4? Interestingly, the main jets screw right out, but I don't see >> any way of removing the slow jets for cleaning, or I would have done that >> while they were off. Never ran it past an idle (raining here for the past >> 2 weeks), so I don't know if #4 kicks in on 1'2 throttle. Thoughts? >> >> -- >> 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.
