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Larry..when you say the bike was in for a carb rebuild, what exactly did they do? Did they put in aftermarket float valve/needle? They are known to leak. Secondly, did the bike sit at all with gas in the carbs after the carb rebuild? It only takes a few weeks for gas to gum things up again. If you have one plug looking different, then that is likely the culprit (as ignition tends to affect pairs of cylinders). How did you 'clean' your tank? You might stil have residual debris getting past the fuel filter, jamming up the float valve in carb #1. That would prevent it from seating, and shutting off fuel when the float comes up. I've been having the same problems in my bike. In my case, the float tang was set incorrectly, and the float was hanging up, not letting the needle seat to shutoff fuel flow. Most certainly, it is worth taking the carbs off if you can and checking the float assembly for proper height and operation in that carb. Ask me how later. One quick try: turn off the petcock. Drain the fuel from bowl #1. Lightly tap the carb bowl with a screwdriver handle or wooden dowel. Sometimes this frees up a stuck float. Clean up or replace that plug. Ride the bike for a bit and check it again. Catastrophic failure of your float would really only occur if it had holes in it, causing it to sink permanently.
Larry..when you say the bike was in for a carb rebuild, what exactly did they do? Did they put in aftermarket float valve/needle? They are known to leak. Secondly, did the bike sit at all with gas in the carbs after the carb rebuild? It only takes a few weeks for gas to gum things up again. If you have one plug looking different, then that is likely the culprit (as ignition tends to affect pairs of cylinders). How did you 'clean' your tank? You might stil have residual debris getting past the fuel filter, jamming up the float valve in carb #1. That would prevent it from seating, and shutting off fuel when the float comes up. I've been having the same problems in my bike. In my case, the float tang was set incorrectly, and the float was hanging up, not letting the needle seat to shutoff fuel flow. Most certainly, it is worth taking the carbs off if you can and checking the float assembly for proper height and operation in that carb. Ask me how later. One quick try: turn off the petcock. Drain the fuel from bowl #1. Lightly tap the carb bowl with a screwdriver handle or wooden dowel. Sometimes this frees up a stuck float. Clean up or replace that plug. Ride the bike for a bit and check it again. Catastrophic failure of your float would really only occur if it had holes in it, causing it to sink permanently.
