My motorized cruiser all of a sudden won't turn on like I release the clutch and throttle and it dies down slowly.I ran 2 ounces of two stroke oil in a Gallon mix.I'm thinking maybe its the spark plug? The cap rubber thing that goes over it is really lose and kind of torn a bit. If it is the spark plug how much would it be for one from AutoZone? And how do I replace the cover thingy I know how to replace the spark plug but thr cover is attached to the small black box.Please someone let me know asap thanks I'm a newbie lol