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I know this is a really stupid question....But the wires from the coils, are they on the right plugs?1 coil for 1&4, the other coil attacked to 2&3....??l8r
Looks like you are running a fuel filter to your carbs, is this clean and oriented vertically?
as they say, 95% of all carburetor problems are electrical, but here you have misfiring cylinders off different coils. Original plug wires? Fire it up in the dark & see of the wires are leaking. now, the carbs: as said, blow out the pilot jet circuit. The needle valves have a tiny preload spring, for checking the float hieght its when the tang just touches- not compresses- the spring loaded pin in the float needle. And I wouldnt rule out bad plugs, no matter how new they may be. I guess if I was sittin there scratchin my head, id swap the two cool cylinder leads with thier respective hot cylinders & see if the problem migrates. No? swap plugs. No?- its a carb issue.....
See all my posts on this page under 'Cold #3 etc.,"......dare I suggest your voltage to the coils is weak ??!! Respectfully, I can see a lot of surface rust on your pics. ( Seattle weather ! )..I'm sure all the wiring connections need attention....IMO.
I had the same problem but with cylinder 1 and 2 when I first got my bike. number 1 would be warm, but not as hot as 3 or 4 and number 2 was dead cold. What I did to solve this problem is check and make sure your points gap is correct, and your plug wires. On number 2 cylinder my wire was shot, it would still make some spark at times but thats it no constant spark...so I replaced it my coils with CBR 600 F2 coils...and my bike has been running smooth as silk, plus if you are looking to upgrade your ignition, these coils cost a fraction of what Dyna coils are and they are rated 3-3.5ohms. I got a set of these coils of ebay with 6000 miles for 30 dollars shipped, and its plug and play basically..just have to put 1/4 connector ends on your coil wires.If you havent done so..check your valves too..that made a huge difference in my bike running smooth
Recleaned carbs. Removed press-in jetsI think that last step is what did it (Thanks, BryanJ!). I didn't want to remove them because of the risk of breaking something, but I went at it with some pliers last night. It appeared to have some microscopic crud lingering, which is enough to restrict fuel flow to the cylinder. I also used carb cleaner, toothpicks, Q-tips and super compressed air out of a narrow nozzle to blow anything else out. This seemed to work. FYI, post '77 carbs are a pain in the ASS. I'll be switching to the 69-76 K-model with air pods! Thanks again for all the input!!
PLUS, the accel pump gives a kick the early carbs cant.
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