i changed the spark plugs and cleaned the carbs. <br />at the lake the motor cranked fine idles good, at about 1/2 throttle the motor starts skipping, missing. then let off idles fine still. cranked it again and did the same thing. now will not fire off. i did check the plugs on was a little black not all the way just on one side.<br /><br />the motor is a 1970 60 hp.
