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Sparkplugs & accessories

MEANING OF REFERENCES
INSTALLATION RECOMMENDATIONS
CASE OF REPLACEMENT

MEANING OF REFERENCES


Thread diameter
 
Thread
Diameter
Key
A 18 mm 25.4 mm
B 14 mm 20.8 mm
C 10 mm 16 mm
D 12 mm 18 mm
E 8 mm 13 mm
G 1/2 mm 23.8 mm
J 12 mm 18 mm
AB 18 mm 20.8 mm
BC 14 mm 16 mm
BK 14 mm 16 mm
DC 12 mm 16 mm
 
Dessin de la bougie
L Short insulation
M Compact type
P Prominent insulation
R Integrated resistor
U Surface discharge
Z Integrated inductance
Thermal index
2 Hot
   
4  
5  
6  
7  
8  
  85
9  
  95
10  
  105
11  
12  
13 Cold
 
Length of thread
E 19 mm
H 12.7 mm
L 11.2 mm
EH Filetage seeds
  Cap L=19 mm
  Thread L=12.7 mm
F Conical seat
  A-F typeb 10.9 mm
  B-F typeb 11.2 mm
  B-EF type 17.2 mm
Drawing of the spark plug
C Oblique mass electrode
F Conical seat
G Fine nickel alloy electrode
GV Palladium gold center electrode - Special shape
J 2 ground electrodes
K 2 ground electrodes
M 2 ground electrodes for MAZDA rotary engine or 18.5 mm insulator
T 3 ground electrodes
Q 4 ground electrodes
P Platinum tip
S Copper central electrode
U Semi-surface discharge type
V Ot-Palladium center electrode
VX Central electrode Platinum
W Tungsten electrode
X Internal spark gap

SECTION OF A STANDARD SPARK PLUG


NGK MOUNTING RECOMMENDATIONS

ELECTRODE SPACING


It is sometimes necessary to adjust the electrode spacing because it does not always match the specific setting for each application.
The adjustment of the electrodes is essential for an optimal combustion !

REPLACEMENT OF A SPARK PLUG


1. Use a suitable spark plug wrench.
2. Wait for the engine to cool before removing the spark plug.
3. Turn the ignition cable cap slightly and remove it by pulling on the cap, not on the cable.
4. Remove the caps one at time so that they do not get mixed up
5. Make sure the cap and ignition cable are not damaged.
6. Loosen the spark plug by 1/4 turn and clean the dirt with compressed.
7. Remove the spark plug.
8. Clean the spark plug seat and refit a new s spark plug by screwing it in by hand without using grease on the threads.
9. VScrew in the spark plug with the recommended tightening torque
(see table opposite).
10. RReplace the ignition cable, making sure the cap is properly that the cap is properly attached.
11. For the other cylinders, repeat steps 4 to 10.
12. Check the condition of the ignition system.

TIGHTENING TORQUE (NGK data)


USE A TORQUE WRENCH

Cast iron cylinder head

Aluminium cylinder head
               
Ø 18 mm 14 mm 12 mm 10 mm 8 mm 18 mm 14 mm
N.m 35 - 40 25 - 30 15 - 25 10 - 15 - 20 - 30 10 - 25
m.kg 3,5 - 4,0 2,5 - 3,0 1,5 - 2,5 1,0 - 1,5 - 2,0 - 3,0 1,0 - 2,5
N.m 35 - 40 25 - 30 15 - 25 10 - 15  8 - 10 20 - 30 10 - 25
m.kg 3,5 - 4,0 2,5 - 3,0 1,5 - 2,5 1,0 - 1,5 0,8 - 1,0 2,0 - 3,0 1,0 - 2,5
// Ø 18 et 14 mm
1/2 - 2/3 turn
(180° à 240°)
// Ø 12 et 10 mm
1/2 turn
(180°)
// Ø 8 mm
1/3 turn
(120°)
The angles are given as an indication. Please refer to the recommended angle indicated on the candle box
A large part of the heat is dissipated through the parting line.
Too much or too little tightening is detrimental to good heat dissipation and can lead to engine damage.

CASE OF REPLACEMENT


  SYMPTOMS
POSSIBLE CAUSES
              SOLUTIONS

Bougie usure
Used electrodes

Lack of engine power
Misfiring
Increased fuel consumption
 
  Exceeding the periodicity of replacement   ▸ Replace the spark plug

Bougie encrassement sec ou humide
Dry or wet fouling

Mad ignition
 
  Air/fuel mixture too rich
  Incorrect thermal range (too cold)
  Delayed ignition
  Incorrect eletrode spacing
  Oil consumption
  ▸ Adjusting the air/fuel mixture
  ▸ Checking the thermal index
  ▸ Check the ignition delay
  ▸ Check the distance between the electrodes
  ▸ Check oil consumption

Bougie fondue
Overheating

Fused, welded electrodes
 
  Incorrect thermal range
  Ignition advance
  Insufficient cooling
  Air/fuel mixture too lean
  Poorly tightened spark plug
 
  ▸ Check the spark plug recommendation
  ▸ Check the ignition advance
  ▸ Check for a cooling problem cooling
  ▸ Check the quality of the mixture
  ▸ Tighten the spark plug to the recommended torque with a torque wrench
 

Bougie dépôt
Deposits

Bad ignitions or no ignition
 
  Poor fuel quality
  Poor oil quality
  Poor engine condition
  ▸ Check the fuel used
  ▸ Check the quality of the oil used
  ▸ Engine control

Bougie céramique cassée ou fendue
Broken or cracked ceramic

Bad ignition or no ignition
 
  Mechanical shocks
  Thermal shocks
  Engine vibrations
  Poor sealing
  Badly tightened spark plug
  ▸ Check the condition of the cylinder head gasket
  ▸ Check for vibration problems engine
  ▸ Tighten the spark plug to the recommended torque with a torque wrench

Bougie filetage cassé
Torn off thread
 
  Use of an unsuitable tool
  Too much torque applied
  ▸ Use a torque wrench
  ▸ Respect the recommended torque
 
(Code: 70126)
Hood of candle bakel LD05F
6.71 €
(Code: 70182)
cap of candle 503/582
13.64 €
Spark plug cap for ROTAX motor - LB05EZ for 503/582
(Code: 70250)
cable candle
2.34 €
Spark plug cable - Exterior diameter 7 mm - One meter
(Code: 70258)
Suppressor cap for spark plug
15.26 €
Anti-parasitic cap for spark plug
(Code: NGKB10ES)
Spark plug NGK B10ES
3.76 €
(Code: NGKB8HS)
Spark plug NGK B8HS
3.74 €
(Code: NGKB9ES)
Spark plug NGK B9ES
3.74 €
(Code: NGKB9HS)
Spark plug NGK B9HS
3.76 €
(Code: NGKBPR6ES)
Spark plug NGK BPR6ES
3.74 €
(Code: NGKBPR8ES)
Spark plug NGK BPR8ES for rotax 503
5.04 €
Spark plug NGK BPR8ES for rotax 503 - Unity
(Code: NGKBR10ES)
Spark plug NGK B10ES
5.77 €
(Code: NGKBR7ES)
Spark plug NGK BR7ES
3.74 €
Spark plug NGK BR7ES used on SKY100 - Unity
(Code: NGKBR8ES)
Spark plug NGK BR8ES 447/503/582
4.98 €
Spark plug NGK BR8ES 447/503/582 - Unity
(Code: NGKBR9EIX)
Spark plug NGK BR9ES -the unit
14.56 €
Spark plug NGK BR9ES - Unity
(Code: NGKBR9ES)
Spark plug NGK BR9ES -the unit
5.05 €
Spark plug NGK BR9ES -the unit
(Code: NGKC8HSA)
Spark plug NGK C8HSA
3.76 €
(Code: NGKCR8HSA)
Spark plug NGK CR8HSA
4.99 €
(Code: NGKDCPR7E)
Spark plug NGKDCPR8E 912S 80HP
6.24 €
Spark plug NGKDCPR8E 912S 80HP Weight of 8 sparks plugs package : 290gr. Weight for a spark plug: 40gr. - Unity
(Code: NGKDCPR8E)
Spark plug NGKDCPR8E 912S 100HP
6.94 €
Spark plug NGKDCPR8E 912S 100HP - unity
(Code: NGKDPR9EA-9)
Spark plug NGK DPR9EA for ROTAX 914
5.72 €
Spark plug NGK DPR9EA for ROTAX 914 it replaces Denso spark plugs - Unity
(Code: NGKDR9EA)
Spark plug NGK DR9EA- JABIRU Engine
5.50 €
Spark plug NGK DR9EA (JABIRU Engine) - Unity