This is probably a fueling issue but just what I'm not sure. As this happens at a partly open throttle setting it may be your float level is too high making it rich at small throttle opening but OK when traveling faster with bigger throttle openings. Have you just recently bought this bike? Has this surging always been there or just now started to surge. If it has always been like this since yoy bought it it's maybe and only maybe because of big main jets.
What do others suggest?
Southern Cross
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