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 CLICK Here for info on Denso Iridium plugs.

 

 

Proper installation of Spark Plugs - CLICK HERE

Standard Plugs
NGK Brand Spark Plugs DENSO Brand Spark Plugs
      IW01-24 DENSO IRIDIUM RACING NSR 50 95- - Replaces NGK R6385-8P  
      IW01-27 DENSO IRIDIUM RACING TRZ 50 94-, CR 80, CR 125, CR 250 90- - Replaces NGK R6385-9P  
31903-NX4-701 SPARK PLUG NGKR6385-10P (Denso # IW01-31) IW01-31 DENSO IRIDIUM RACING RS 125 90-, RS 250 93-, TZ 125 94-, TZ 250 90-94, TZ 250 95- - Replaces NGK R6385-10P
31901-NX4-701 PARK PLUG NGKR6385-10.5P - 31901-NF4-651 (use Denso # IW01-32) Replaced by Honda with 31901-NX4-702 R7376-10P/10.5P   IW01-32 DENSO IRIDIUM RACING RS 125 90-, RS 250 93-, TZ 125 94-, TZ 250 90-94, TZ 250 95- - Replaces NGK R6385-105P
31901-NX4-702 SPARK PLUG R7376-10P/10.5P (Honda replaced NGKR6385-10.5P - 31901-NF4-651, 31901-NX4-701) (use Denso # IW01-32 for a 10.5 heat range)      
31902-NX4-701 SPARK PLUG NGKR6385-11P - 31902-NF4-671 (Denso # IW01-34) IW01-34 DENSO IRIDIUM RACING RS 125 90-, RS 250 93-, TZ 125 94-, TZ 250 90-94, TZ 250 95- - Replaces NGK R6385-11P
      IW-22 DENSO IRIDIUM POWER NSR 50 89-95  
      IW-24 DENSO IRIDIUM POWER NSR 50 95-  
      IW-27 DENSO IRIDIUM POWER TZM 50 94-, CR 80, CR 125, CR 250 90-
      IW-31 DENSO IRIDIUM POWER MH 80
      IWM01-32 DENSO IRIDIUM RACING TZ 250 90-94, TZ 250 95-, NSR 250 90-, TZR 250R SP 94-, RGV 250 SP - Replaces NGK R6179A-105P
30700-NX4-000 Honda Standard Plug Cap ASSY., NOISE SUPPESSOR - replaces 30700-KM9-163 8DG-82370-00 Yamaha Standard Plug Cap ASSY -replaces 4PE-82370-10
 
Short Ceramic with standard reach for Air box installations

NGK Brand Spark Plugs

DENSO Brand Spark Plugs

31940-NX5-751 SPARK PLUG NGKR6120-10 5  SOLD OUT (REPLACED BY NGKR7282-105)        
31940-NX5-752 SPARK PLUG NGKR7282-105  (REPLACED NGKR6120-10 5)  (Denso # IAE01-32) - SOLD OUT  - Short ceramic for airbox clearance and Std reach IAE01-32 DENSO IRIDIUM RACING - short ceramic W/OUT DETONATION COUNTER - M14x19 16HEX - Replaces NGK R6120-10.5
31950-NX5-751 SPARK PLUG NGKR6120-11 (Denso #IAE01-34) SHORT PLUG  11       
31950-NX5-003 SPARK PLUG, NGKR6120-11 (Denso #IAE01-34) SHORT PLUG  11   IAE01-34 DENSO IRIDIUM RACING - short ceramic W/OUT DETONATION COUNTER - M14x19 16HEX - Replaces NGK R6120-11
30700-NX5-003 SPARK PLUG CAP FOR SHORT PLUG - NGK TRS-1225 - 14mm thread, rubber sheathed (Silicon) For racing spark plug R6120 & R7282
 - USE CAP BELOW
       
NGKTRS-1225 NGKTRS-1225 - SPARK PLUG CAP FOR SHORT PLUG (Blue) - - 14mm thread, rubber sheathed (Silicon) For racing spark plug R6120 & R7282 - Honda parts number 30700-NX5-003      
Short Ceramic with long reach reach for Detonation Counter installations

NGK Brand Spark Plugs

DENSO Brand Spark Plugs

31910-NL6-003 SPARK PLUG NGKR7279-10 (Denso # IA01-31)        
31930-NX5-003 SPARK PLUG,NGKR6120-10  (31930-NX5-751) (Denso # IA01-31)        
31930-NX5-751 SPARK PLUG NGKR6120-10 - 31930-NX5-003 (Denso # IA01-31)        
31940-NX5-851 SPARK PLUG NGKR6120A-105 For detonation counter use 31940-NX5-852 (Denso # IA01-32)        
31940-NX5-852 SPARK PLUG NGKR7282A-105 Replaced 31940-NX5-851 NGKR6120A-105  - Short ceramic and long reach for detonation counter IA01-32 DENSO IRIDIUM RACING RS 125 90-, RS 250 93-, TZ 125 94-, TZ 250 90-94, TZ 250 95-  (Detonation Counter) - Replaces NGK R6120A-105
      IA01-34 DENSO IRIDIUM RACING RS 125 90-, RS 250 93-, TZ 125 94-, TZ 250 90-94, TZ 250 95-  (Detonation Counter) - Replaces NGK R6120A-11
30700-NX5-003 SPARK PLUG CAP FOR SHORT PLUG - NGK TRS-1225 - 14mm thread, rubber sheathed (Silicon) For racing spark plug R6120 & R7282        
NGKTRS-1225 NGKTRS-1225 - SPARK PLUG CAP FOR SHORT PLUG (Blue) - - 14mm thread, rubber sheathed (Silicon) For racing spark plug R6120 & R7282 - Honda parts number 30700-NX5-003      

Other Standard Plugs we stock

NGK Brand Spark Plugs

DENSO Brand Spark Plugs

      IU01-31 DENSO IRIDIUM RACING RVF/ NC35, CBR400RR 94-, CBR400SF, FZR400RR/SP 90-, ZXR400RR, CBR600F 99-00,  CBR600F4i 01-, YZF-R6 99-, ZXR750 -95, YZF-R1 99-
      IUH24 DENSO IRIDIUM POWER
      IX24 DENSO IRIDIUM POWER
      IX27 DENSO IRIDIUM POWER
      IXU01-31 DENSO IRIDIUM RACING ZEPR400, ZR-7
31910-NL3-620 PLUG,SPARK NGKR0045Q-10 (Denso # RU01-31)   RU01-31 DENSO IRIDIUM RACING CBR600F 99-00, CBR600F4i 01-, YZF-R6 99-, YZF-R1 99-
      RU01-34 DENSO IRIDIUM RACING RVF/ RC45
31910-NL6-000 SPARK PLUG NGKR7119-10(IR) (Denso # IK02-31)        

 

Heat Range            
NGK 7 8 9 10 10.5 11
DENSO 22 24 27 31 32 34
           
Bike Year NGK DENSO  
TZM50 94- B9EG   IW-27   IRIDIUM POWER
TZR50 -   IW01-27   IRIDIUM RACING
NSR50 89-95 B7EG   IW-22   IRIDIUM POWER
NSR50 95- B8EG   IW-24   IRIDIUM POWER
-   IW01-24   IRIDIUM RACING
CR80R 90-01 B9EG   IW-27   IRIDIUM POWER
CR125R
CR250R -   IW01-27   IRIDIUM RACING
MH80 ALL B10EG   IW-31   IRIDIUM POWER
    R6385-10P    IW01-31    
RS125R 90-01 R6385-10.5   IW01-32   STD
R6385-11P   IW01-34    
R6120A-10.5
Replaced by
R7282A-105
  IA01-32    
RS250R 93-01 R6120-10.5
Replaced by
R7282-105
  -   STD
R7282A-105   IA01-32    
TZ125 94-01 -   IW01-32   STD
R7282A-105   IA01-32    
TZ250 90-94 -   IWM01-32   STD
R7282A-105   IA01-32    
TZ250 95-01  R6179A-P-10.5   IWM01-32   STD
R7282A-105   IA01-32    
NSR250 90- R5300A-10.5   IWM01-32   STD
R6120-10.5   -   NX5/RS250R
TZR250RSP 94- -   IWM01-32   IRIDIUM RACING
TZR250/SP 90-93 -   IW01-32   IRIDIUM RACING
RGV250Γ/SP - -   IWM01-32   IRIDIUM RACING
RVF/NC35 - R017-10 (R016-10)   IU01-31    
CBR400RR 94- R017-10 (R016-10)   IU01-31    
CB400SF - R017-10 (R016-10)   IU01-31    
FZR400RR/SP 90 R017-10 (R016-10)   IU01-31    
ZXR400R - R017-10 (R016-10)   IU01-31    
ZEPR400改 - R017-10 (R016-10)   IU01-31    
ZEPR400 - -   IXU01-31    
CBR600F/F4i 99-01 R0379A-10   IU01-31    
-   RU01-31    
YZF-R6 99-01 R0379A-10   IU01-31    
R0045Q-11   RU01-31    
ZX-6R 90-01          
GSXR600 1          
RVF/RC45 - R0045Q-11   RU01-34    
ZR-7 - -   IXU01-31    
ZXR750 -95 R0379A-10   IU01-31    
YZF-R1 99-01 R0379A-10   IU01-31    
R0045Q-11   RU01-31    
ZX-9R 1          

Proper Installation of Spark Plugs
In the past we have had a few racers tells us of a spark plug in which the ceramic separated
from the metal outer housing and caused air leakage and which then seized their motor.
I spoke to a Denso engineer at Suzuka who simply showed me the information below which
most of us pay little attention to.
He then explained that over torque will stretch the metal outer shell and break the seal.
For more light reading on spark plugs in general CLICK HERE