spark plug Naraku 14-R9-LS (BR9ES) NK14-R9-LS fitting for Aprilia RX Racing6-Gang 50 STC00 2003,

Naraku spark plug as it is also mounted in the vehicle from the factory. Heat value and plug design correspond to the original.

Produced according to OEM guidelines of Japanese vehicle manufacturers for a perfect and long-life repair.

The service life of a spark plug depends on the fuel type, engine condition, operating hours and engine temperature. For 4-stroke engines with 250cc or more, the spark plug should be cleaned or changed after 6000km. With smaller capacity, especially 2-stroke, approx. every 2500km. After this mileage, oil carbon deposits lead to starting difficulties and loss of power caused by the spark plug. Increased short-distance operation and poor engine oil quality can shorten the intervals.

Width across flats: 20.8mm
Thread diameter: 14.0mm
Thread length: 19.0mm
Electrode gap: 0.8mm
Resistance: suppressed, 5kOhm

OEM numbers for comparison purposes only:

NGK: BR9ES
Bosch: WR 3 CC / 0 242 255 502
Champion: OE 091 / QN 2 / QN 2 C / RN 2 / RN 2 C
Denso: W 27 ESR / W 27 ESRU

14 = B thread diameter 14mm
R = R (Resistor) resistance plug 5kOhm
9 = 9 heat value
L = E (Long) long plug thread
S = S Standard