At the OMB warehouse we strive to provide the greatest selection and quality of parts for your outdoor power equipment. Need other parts to complete your project? Check out our huge catalog - we have what you need. AR3910X racing spark plug description: This is the spark plug you want for the Honda clone or the animal. Gasoline or Methanol. This plug greatly outperforms the stock plug that comes with a clone engine. We have seen as much as a 3/4 HP gain simply by changing to this plug.