Your boat's spark plugs may be failing or in poor condition, if you had difficulty starting the engine, lost engine power, or experienced decreased acceleration. Invest in a high-quality spark plug to improve your boat's performance. The SPARK PLUG BP8HS-10 (86-3823) has 14mm thread, 12.7mm reach, flat seat type, 21mm hex size, projected tip configuration, and removable terminal type. It is a genuine OEM replacement for part # BP8HS-10-. The SPARK PLUG BP8HS-10 (86-3823) is a genuine champion spark plug. It's perfect for automotive, marine, power sports, and small engine applications. For overall performance, the copper core electrode improves conductivity and heat control. Key Features: It has 14mm thread, 12.7mm reach, flat seat type, 21mm hex size, projected tip configuration, and removable terminal type. Genuine OEM replacement for part # BP8HS-10- It is a genuine champion spark plug. The copper core electrode improves conductivity and heat control. Specifications: Brand: Autowares SKU: 86-3823 UPC: 087295438237 Weight: 0.15 LBS