I was having the same problem and decarbed my motor. This helped considerably. If this hasn't been done before I would recommend it. It cost me about 6$ and an hour and a half of time. You can find 2 ways to do it using SeaFoam products in the FAQ section of the forum. Hope this helps.<br />Mic
Is your carburetor air/fuel mixtute and idle speed set correctly? NGK plugs seems to function better at low speeds than Champion. Ditto for the advice on decarboning!!!