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The bike you describe is very unlike my '00 RS. I dont' think a sprocket change is going to help. I have the stock sprocket and I don't see any of that stuff.
It sounds like you need a mechanic that is willing to spend more time diagnosing a problem. The fuel pump is a mighty expensive WAG, but i don't have the whole story so maybe it is legit.
so according to my manual, poor running at low speeds could be a weak spark (bad battery, spark plugs, spark plug caps, ECM), Fuel air mixture incorrect (clogged injector, clogged air filter, poor sealing on air box, fuel tank breather hose blocked, intake air leak, idle air control valve or vacuum hoses, pressure regulator, filter, fuel pump, relay) or finally low compression (loose plugs, loose cylinder head, tight valve worn piston/liner/rings, oh good lord, there is too much to mention here, get your own manual)
But in my experience when a fuel pump goes, you end up on the side of the road in short order. That would have been the last thing I replaced unless I had tested it and something didn't check out.
Also just for the record, my idle air control valve vacuum hoses were rotted at the fittings and caused a whole host of low speed problems. It is something to check at least. Post up when you find out what is wrong..
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