hi: there is no carberater, issue all lines or new, the carb was takeing apart and cleaned up . and all parts were put in carberater cleaner, overnight and compressed air was used to blow out all the passages. there is no sputter, hesitation, it has very good power and acceleration. i also check out the generater, stater, pulsing coil, when the engine was cold.yes i check for a spark at the spark plug, and the spark seems to be very week its a red spark or no spark at all. thank you very much.