Main Benefits

• Better combustion efficiency
• Faster throttle response
• More stable spark at high RPM
• Longer service life than standard copper plugs
• Improved ignition consistency

Heat Range Information

The 9 in AB9R31 indicates a relatively colder heat range spark plug, which is more suitable for:

• tuned engines,
• high-compression setups,
• aggressive riding,
• racing/high-RPM use.

Best Applications

This plug works especially well with:

• upgraded ignition coil (UMA FI coil),
• high-compression piston kits,
• ECU tuning,
• big throttle body setups,
• performance exhaust systems.

Important Note

For completely stock commuter motorcycles, a colder racing plug may sometimes:

• carbon foul during slow city riding,
• require proper AFR tuning,
• perform best under spirited/high-temperature usage.

Directly listed compatible models include:

Yamaha

• Yamaha R15
• Yamaha MT-15
• Yamaha R3
• Yamaha FZ16
• Yamaha MT-03

Royal Enfield

• Royal Enfield Himalayan
• Royal Enfield Interceptor 650

Honda

• Honda CBR150R

Suzuki

• Suzuki Gixxer

Kawasaki

• Kawasaki Ninja 250
• Kawasaki Ninja 300

Benelli

• Benelli TNT 300
• Benelli Leoncino
• Benelli TRK 502