have you synced the carbs?
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Agree with Vacuum leak
I agree with Bones. Might as well do it and get it over with because if you haven't replaced this hose, you are going to eventually. Better to spend a day or two stripping the bike down and replacing it. IMHO this is the culprit 9 times out of 10 with a surging idle at stop lights, decreased take off, and increased fuel consumption. Yes you have to pull a lot of plastic off, yes you have to pull everything off down to the carburetors, but you do not have to pull the carbs out, you merely "pop" them off the rubber boots and push them out of the way. Then lift the ubiquitous "rubber mat" and replace the hose. Just push the new hose over the nipples, do not use clamps, wires, etc. It has a constant vacuum from the manifold and does not need to be secured with anything.
Use a couple of muffin pan from Goodwill to keep your screws and small parts organized.
Once you are done, then re-synch the carbs.
I agree with Bones. Might as well do it and get it over with because if you haven't replaced this hose, you are going to eventually. Better to spend a day or two stripping the bike down and replacing it. IMHO this is the culprit 9 times out of 10 with a surging idle at stop lights, decreased take off, and increased fuel consumption. Yes you have to pull a lot of plastic off, yes you have to pull everything off down to the carburetors, but you do not have to pull the carbs out, you merely "pop" them off the rubber boots and push them out of the way. Then lift the ubiquitous "rubber mat" and replace the hose. Just push the new hose over the nipples, do not use clamps, wires, etc. It has a constant vacuum from the manifold and does not need to be secured with anything.
Use a couple of muffin pan from Goodwill to keep your screws and small parts organized.
Once you are done, then re-synch the carbs.
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+1... Also, while you're re-installing the carbs, put a thin layer of Air Filter Grease on the Rubber Boots, to otherwise prevent a Lean condition caused by air leakage at that joint.
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