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Join Date: Nov 2007
Location: Chandler, Arizona
Check the throttle, both cables, and the linkage on the carburetors. Sometimes things get dried out or corroded. When you open the throttle all the way with the engine off, it should instantly snap closed when you release it. If it doesn't, it is binding or sticking somewhere. The "fuel screw plugs" refers to the lead plugs over the idle air/fuel mixture screws. there is one on each carb. If they are still there, leave them alone for now. The factory setting isn't perfect, but will not cause the kind of problems you are describing. If they are missing, go ahead and remove both screws and springs, spray a little Gumout carb cleaner into where the screws were, then spray WD-40 on the screws, put them back in, turn them until they seat lightly, then back them out about 2 1/2 turns. That is a good starting point. It should run fine there. If both the throttle/cables/linkage and the A/F mixture screws are ok, then start looking for vacuum leaks between the carbs and the engine, or in the carbs themselves. Both carbs have a vacuum fitting on them. Make sure they are not leaking. Don't worry about looking for air leaks between the air filters and carbs right now. While leaks there can let dirt into the engine over time, they will not lean out the air/fuel mixture enough to cause problems. Check that after you get the engine running right. Jerry.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike