| KLG spark plug Type | Size | Reach |
| KLG spark plug M30 | M18 x 1,5 | 12,7 mm |
| KLG spark plug M50 | M18 x 1,5 | 12,7 mm |
| M18 x 1,5 | 12,7 mm | |
| M18 x 1,5 | 19 mm | |
| KLG spark plug FE55CPDR-11 | M14 x 1,25 | 19 mm |
| KLG spark plug FE65AP - Platin | M14 x 1,25 | 19 mm |
| KLG spark plug FE65CPD | M14 x 1,25 | 19 mm |
| KLG spark plug F15M | M14 x 1,25 | 12,7 mm |
A plug may be subjected at times to deposits of oil and carbon,
and at other times to extreme heat. Under this conditions, the nose
of the insulator must be sufficiently hot to burn off the oil
and carbon fouling, but not so hot as to cause self-ignition.
