Spark Plug (BR9EG) for Cagiva/Gas Gas/Honda/Husqvarna/Kawasaki/Suzuki/Yamaha Applications

Every year the range of NGK spark plugs grows to accommodate the ever-increasing demands of modern engines. Spark plug design must take into consideration many features of an engine including physical dimensions, combustion chamber shape, cooling abilities, fuel and ignition systems. Spark plugs play a vital role in producing the maximum power from an engine whilst keeping fuel consumption and emissions to a minimum. Choosing the correct spark plug type will help a vehicle manufacturer meet legislated emission targets and assists the motorist in getting the best from their engine. 

Increases in the size and the requirement to improve the cooling of the inlet and exhaust valves have meant that the space available for the spark plug is severely restricted on some cylinder heads. A change in spark plug design, possibly the adoption of a taper seat and extended reach (threaded portion) or even the use of a smaller diameter is often the answer. Some engines require the use of two spark plugs per cylinder and again due to space restrictions these might be of different sizes. 

Changes in fuelling systems and the fuel itself have meant some special features being adopted at the ‘firing end’ of the spark plug. Extra projected types push the spark position into the heart of the combustion chamber to promote better combustion of the fuel/air mixture, which is weaker than ever in an effort to improve economy. Modern engine manufacturers often require increased spark gaps to allow a longer spark duration, which again aids more efficient combustion. 

To combat the ‘cold fouling’ effect that can occur in some engines using unleaded fuels specially arranged ground electrodes are sometimes used. These can force the spark to discharge across the insulator and thus burn away any built-up carbon that could cause poor starting or misfires. It is not uncommon to find two, three or four ground electrode arrangements in new vehicles. The use of precious metals on the tips of the spark plug electrodes is not uncommon especially on higher performance engines. Whilst these spark plugs do have increased service life, they are often specified because of their superior ignition qualities. 

Our engineering departments work very closely with the engine and vehicle manufacturers to produce the ideal spark plug type for each application. Any change in production is expensive for a manufacturer and therefore new spark plug types are only produced where necessary. NGK employ the very latest production technology to ensure that every aspect is catered for – performance, economy and value.

Compatible with:
CAGIVA    Mito 125    91→
CAGIVA    Mito 525SP    04/08→
CAGIVA    Raptor    04→
GAS GAS    EC 125 Racing, EC 125 SIX    10→
GAS GAS    SM 125 Supermotard    03→07        
HONDA    CR125R D-Y    83→00
HONDA    CR250R-J    →
HUSQVARNA    CR125    02→05
HUSQVARNA    CR125    10→
HUSQVARNA    SM125 /S    98→
HUSQVARNA    WR125    02→
HUSQVARNA    WRE125    98→04
HUSQVARNA    WRE125    09→12
KAWASAKI    KX60 B14-B17    98→01
KAWASAKI    KX80 C-R1    81→91
KAWASAKI    KX100 A1-A2, B1    89→91
KAWASAKI    KX250 A1-A7, B1    75→82
KAWASAKI    KX250 D2, E1, F1, G1, H1-H2    86→91
KAWASAKI    KX500 A1-A2    83→84
SUZUKI    RM125 E, F, G, H, J    84→88
SUZUKI    PE400 T, X, Z    80→82
TM RACING    MX 85    12→
TM RACING    MX 100    12→
TM RACING    MX 125    12→
TM RACING    SMM/SMR 125    12→
TM RACING    MX 144    12→
YAMAHA    YZ80    84→92
YAMAHA    YZ100L    01/84→12/84
YAMAHA    YZ125    91→96
YAMAHA    YZ125    98→05