Irridium spark plugs from NGK Racing Series
Explanation of NGK heat numbers and how to use them on a go-kart engine
In damp cold weather you need NGK 8
Normal weather like12-23 degrees NGK 9
Warm weather around 23 degrees and more NGK 10
For engines such as J125, S125, IAME, Rotax, J60, TM, Vortex, X30 etc..
- Thread: 14x1,25 mm
- Wrench: 21 mm
- Resistor: yes
