
NGK recommended spark plug for both 1300 and 1500 models.
Use with 0.7mm gap for original specification ignition systems.
This is a resistor type plug to lower radio frequency interference.
Sold as a set of 4.
These plugs have a 90º groove cut in the centre electrode that forces the spark to occur at the periphery of the electrode resulting in
- Less material to obstruct burn - faster flame kernel growth;
- Less heat energy absorbed by electrode mass – reduced quenching effect;
- Enhances the potential gradient - less voltage required to create spark;
- No loss of service life;