CHAMPION COPPER PLUS SPARK PLUG CCH388 RG6HCC M8 XG

The Champion Copper Plus CCH388, also known as RG6HCC, is a specific 10 mm spark plug designed for Milwaukee-Eight (M8) and Harley XG engines with dual spark plugs per cylinder.

Technical Features

• Reference CCH388 / RG6HCC.
• 10 mm thread, compact size for modern cylinder heads.
• M8 engines use 4 spark plugs, while XG engines use 2 spark plugs.
• Use with a 16 mm spark plug wrench.
• Copper core with SAC-9 resistance for stable and controlled spark.
• Ultraseal™ coated housing for corrosion protection.

Advantages for M8 and XG Engines

• Designed to handle the high pressures and temperatures of modern engines.
• Enhances combustion quality and helps maintain a smoother idle.
• Perfect as an official maintenance replacement or high-quality equivalent.

Usage Recommendations

• Always adhere to the number of spark plugs per engine (4 in M8, 2 in XG).
• Adjust the electrode gap to the measurement specified by the manufacturer.
• Pair it with good oil and a filter to keep the engine in perfect condition.

Champion Copper Plus for Your Modern Harley

If you want to keep your M8 or XG running like new, the CCH388 Copper Plus offers reliability, durability, and a clean spark in every cycle.

Compatibility

17-24 M8; 15-20 (NU) XG750/500 Street; 17-20 (NU) XG750A Street