the bike is running weak ,in other words the fuel air mixture has too much air and not enough fuel check the vaccum pipe to the carb from the vaccum fuel tap is not spilt as ths is common on speedfights also check the flow of the fuel from the fuel pipe after sucking on the vacccum pipe (carb end)the jets in the carb may also need cleaning or the circlip on the slide needle in the carb may need to be moved further towards the pointed end of the needle.
adam
April 2008
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