What alternate spark plug can I use?

Operating motorized bicycles or bicycle engine kit involves some risk of bodily injury . Buyer accepts responsibility for any and all vehicle operation that may lead to personal injury, economic loss, social distress, other losses, costs and damages. EHBC Distributors Ltd is not responsible for injuries and/or damages resulting from operating this motorized bicycle or bicycle engine kit . Motorized bicycles are not recommended for use by persons under 16 years of age. Obey all traffic regulations. Always wear a helmet while riding. Never operate your motorized bicycle on a pedestrian through way or sidewalk while the engine is running. Never operate your motorized bicycle in an unsafe manner. Check local and state laws before riding on streets.