i have a 1974 650 that sputters and coughs between 2500-3500 RPM. it idles fine. new plugs. have tried both 87 and 93 octane fuel. sputters with both. thanks
Have you checked your fuel pump? I had the same problem and was told to check my fuel pump. Sure enough it had a small hole in the diaphram. A diaphram kit shouldnt be no more than $5.00.
