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I am a new member and would like to thank everyone for all the great information provided. I have an 87 with about 47k miles that I purchased new. Although, I am not a mechanic, I have always done all maintenance on the bike except for a valve adjustment done at 30k. The only repair it ever needed was a starter gear train replacement that I did myself. A couple of months ago, after sitting for a couple of months, the bike would only run with the choke on. Relying on info from the forums, I tried the Seafoam treatment with no luck so I removed and cleaned the carbs. After this, the bike runs without the choke but cylinder #4 won’t run. So far I have synced the carbs, changed the air and fuel filters, changed the spark plugs and switched cylinder 2 and 4 plugs, measured the carb fuel level, checked for vacuum leaks as best I could, tried adjusting the idle mixture screw and removed the carb vent hose. I have also switched the diaphragm and slide assembly between #3 and 4 carbs with no change. (I don’t know if this is recommended but I wanted to try it before buying a diaphragm) The cylinder will run if carb cleaner is sprayed directly into the carburetor. I am not completely sure this problem didn’t exist prior to working on the carbs. So, I am looking for other tests or possible fixes I can try. If I have to remove and disassemble the carbs again, where should I focus my attention? The bike has been trouble free for 22 years so I don’t have much experience in these matters. Thanks for any help provided.
