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Mazda Spark Plug Denso

Mazda Spark Plug Denso - RX7 1979-1983

Part No: W25EBR (3103 NGK BR8ET)
Other Bikes This Part Also Suits:

In Stock?: Yes | 6 available
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Thread Diameter and Hex Size
< Thread Diameter x Hex Size > (mm)
M --- 18 x 25.4 (Reach: 12mm)
L --- 18 x 22.2 (Reach: 12mm)
MW --- 18 x 20.6 (Reach: 12mm)
MA --- 18 x 20.6 (Tapered seat, Reach: 12mm)
FK+ --- High Ignitability Plug (0.55mm Ir center electrode, Pt ground electrode)
J* --- 14 x 20.6 (Projected plug)
K+ --- 14 x 16.0 (Miniature plug)
KJ*+ --- 14 x 16.0 (Projected miniature plug)
LP* --- 14 x 20.6 (Plug for LPG applications)
P* --- 14 x 20.6 (Platinum plug)
PK* --- 14 x 16 (Miniature platinum plug)
PKJ* --- 14 x 16 (Projected miniature platinum plug)
PQ* --- 14 x 16 (Miniature platinum plug)
Q* --- 14 x 16 (Miniature plug)
QJ* --- 14 x 16.0 (Miniature projected plug)
QL* --- 14 x 20.6 (Miniature long cylinder housing plug)
S* --- 14 x 20.6 (0.7mm diameter iridium)
S --- 14 x 20.6 (Surface gap plug (for RE engines))
SK+ --- 14 x 16 (0.7mm diameter miniature iridium plug)
SKJ*+ --- 14 x 16 (Projected 0.7mm diameter miniature iridium plug)
SV --- 0.4mm diameter iridium with platinum ground electrode
T --- 14 x 16.0 (Tapered seat)
TR@ --- 14 x 20.6 (For marine applications)
W --- 14 x 20.6
  --- 14 x 19.0 (Compact type)
X --- 12 x 18.0
XE --- 12 x 14.0
XU --- 12 x 16.0
U --- 10 x 16.0
U --- 10 x 14.0 (U20M-U Only)
N --- 10 x 16.0
Y --- 8 x 13.0
Z --- 1/2PF x 23.8
Z --- 0.55 mm diameter iridium
* --- Reach: 19.0
+ --- ISO compatible
@ ---Reach: 12.7


Heat Range
DENSO NGK CHAMPION BOSCH
9 2 18 10
14 4 16,14 9
16 5 12,11 8
20 6 10,9 7,6
22 7 8,7 5
24 8 6,63,61 4
27 9 4,59 3
29 9.5 57  
31 10 55 2
32 10.5 53  
34 11    
35 11.5    


Reach
A --- 19mm
(Electrode position: 7mm)
  --- 21.5mm
B --- 19.0mm
(Electrode position: 9.5mm)
C --- 19.0mm
(Electrode position: 5.0mm)
D --- 19.0mm (Shroud: 2mm)
E (With gasket) --- 19.0mm
20.0mm
E (Taper seat) --- 17.5mm
F --- 12.7mm
FE --- 19.0mm (Half thread)
G --- 19.0mm (Shroud: 2.8mm)
  --- 19.0mm (Shroud: 3.0mm)
H --- 19.0mm
(Electrode position: 8.5mm)
  --- 26.5mm
L --- 11.2mm
M --- 8.6mm
N
(Taper seat,
HALF THREAD)
--- 17.5mm
V
(Tapered seat)
--- 25.0mm
None --- 9.5mm
11.2mm
19.0mm
21.5mm
None (Tapered seat) --- 8.3mm
11.2mm
11.2mm


Shape (Type)
A --- Double ground electrodes
A --- Oblique ground electrode (For racing)
AY --- Double ground electrodes with bent shape (special)
B --- Triple ground electrodes
BG --- Triple ground electrodes (shrouded)
D --- Quadruple ground electrodes
K --- 1mm Insulator projection
LM --- Compact type (Hex size: 20.6mm)
M --- Shortened insulator head length
M --- Compact type (Hex Size: 19.0mm)
N --- Racing type (Nickel electrode)
Pt --- Racing type (Platinum electrodes)
P --- Projected (1.5mm projection)
S --- Non-projected (0mm projection)
  --- Iridium on a single side
T --- Double ground electrodes
TM --- Double ground electrodes
TN --- Double ground electrodes
V --- Slant ground electrode
X --- Fully projected (2.5mm projection)


Internal Construction
R --- With Resistor
None --- Without Resistor

< Exception >
S29A, S29 both have Resistors


Shape (Type)
-A --- Special specification
-B --- Special specification
-C --- Cut-back ground electrode
-E --- Special specification
-F --- Special specification
-G --- Grease applied on to threads, for CNG applications
-GL --- Platinum center electrode
-L --- For CVCC, with a withdrawn insulator
  --- 3.5mm projected insulator for motorcycles
  --- Withdrawn insulator for motorcycles
  --- Thin center electrode for motorcycles
  --- Heat resistant ground electrode
-M --- Larger ground electrode
-N --- For Yamaha and Kawasaki
-P --- Ground electrode has a double layer of platinum
  --- Center or ground electrode has platinum
-S --- Semi-surface gap discharge type
-S --- Stainless gasket
-TP --- Platinum on center electrode, with taper cut ground electrode
-U --- U-cut ground electrode
-US --- Star-shaped center electrode is used
-V --- 1.3mm diameter nickel center electrode
-Z --- Taper cut
-ZU --- ZU Plug


Gap
5 --- 0.5mm (.020'')
8 --- 0.8mm (.032'')
9 --- 0.9mm (.035'')
10 --- 1.0mm (.040'')
11 --- 1.1mm (.044'')
13 --- 1.3mm (.050'')
14 --- 1.4mm (.055'')
15 --- 1.5mm (.060'')
20 --- 2.0mm (.080'')