PACK OF 4 CHAMPION COPPER PLUS SPARK PLUGS J12YC H-D 3-4

The Champion Copper Plus J12YC falls within the H-D 3-4 equivalency range, making it a popular choice for various Harley engines with 14 mm thread and short reach.

Features

• Equivalency H-D 3-4.
• 14 mm thread with a short reach of 1/2" (12.7 mm).
• Compatible with a 21 mm spark plug socket.
• Copper core in the central electrode.
• Ultraseal™ coated housing resistant to corrosion.

Real-World Benefits

• Reliable ignition for mixed city-highway use.
• A great maintenance replacement option for engines sharing a thermal range between H-D 3 and 4.
• Helps maintain stable and clean combustion.

Recommendations

• Check your motorcycle's manual to confirm the J12YC / H-D 3-4 equivalency.
• Adjust the electrode gap according to specifications.
• Pair the spark plug change with a general ignition check (wires, coil, etc.).

Champion Copper Plus for Daily Use

The J12YC is a balanced, durable, and reliable spark plug, perfect for keeping your Harley always ready to ride.

48-74 Big Twin (NU)