Accel U-groove platinum spark plug set. 14mm

HD 5R6APP. 14mm threaded long reach. Used with 21mm spark plug socket. Equipped with a U-groove platinum tip. Platinum plugs are more durable have a wider heat range and will work with a lower voltage. By maintaining a precise gap over a longer period it will provide a longer life than regular spark plugs. Custom replacement for OEM 32328-97 accessory platinum spark plug set.