NGK BR9HS short base spark plug (medium index)

The BR9HS spark plug from NGK is a very strong original type spark plug with a short base. Use it during your break-in and your adjustments, average thermal index, it has the right temperature to make the adjustments and break-in or to run your original engine all the time or even pushed (kite). It is not made for extreme performance. This model R has a 5 kOhm resistor for regulation and protection, it will therefore be accompanied by a 5 kOhm resistor.

- Index: medium (9 = 27 at denso)

-Reserved for engines: origin a moderately powerful or very equipped during the break-in / adjustment period.

What does BR9HS mean:

- B = Ø14mm base (to be tightened with 20.8mm key)
- R = With 5 kOhm resistance
- 9 = average thermal index (between cold and hot)
- H = thread length 12.70mm (short base)
- S = Central copper electrode