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2 0 2 0 / 2 0 21 RACING SPARK PLUGS

Spark Plug Maintenance

How to correctly install spark plugs

You must take great care when installing spark plugs. In particular, you have to watch the torque. If you use too much or too little
torque when installing spark plugs you can cause damage to the spark plugs and the engine, so be sure you abide by the following.

Be sure to use the correct spark plug wrench. Standard Torque Tightening torque
35～40Ｎ・ｍ（3.5～4.0kgm）
Some engines have narrow spark plug holes thereby preventing the Plug thread size 25～30Ｎ・ｍ（2.5～3.0kgm）
spark plugs from being tightened correctly with a plug wrench that φ18mm 15～20Ｎ・ｍ（1.5～2.0kgm）
does not perfectly fit the hexagonal portion of the plug. So, please use φ14mm 10～12Ｎ・ｍ（1.0～1.2kgm）
the appropriate spark plug wrench for your engine. φ12mm
φ10mm 8～10Ｎ・ｍ（0.8～1.0kgm）
Be sure to tighten the spark plug to the correct torque. φ8mm

Screw in the spark plug and then use a torque wrench to tighten the Conical seat type (without gasket)
spark plug to the standard torque noted in the chart on the right. If you
do not have access to a torque wrench screw in the plug with your Tightening torque 10～20Ｎ・ｍ（1.0～2.0kgm）
fingertips and then tighten to the rotation angle noted below
(corresponds to the tightening torque in the chart on the right) using a
spark plug wrench once the spark plug comes in contact with the
spark plug tube gasket mount.

CAUTION If any lubricants, such as grease, or seizure prevention agents are used on the threads there is a danger of over tightening
the spark plug past the standard torque. Therefore, do not use lubricants or seizure prevention agents on these parts.

Tightening angles Heat range number enters

Thread size New gasket Used gasket
φ18mm・φ14mm（except▼）
1 ～ 2 of a turn（180°～240°） 1 of a turn（30°）
BCPR ED BCPR EDIX BCPR EKD BKR EKE 23 12
BKR EKUC BKR EKUD BKR ETUA IZFR C
PZFR C R6918C- 1 1
of a turn of a turn
DILKAR G11DS φ12mm（except▼）
DILKAR P8SY 3 12
DILZKR A11DS （120°） （30°）
DPR EA-9S
ILZKAR H8S 1 of a turn（180°） 1 of a turn（30°）
ILZKR B11GS 2 12
LKAR AP7JDS
LKR AHX-S DILKAR G11GS DILKAR H11GS DILKAR P8DY 1 of a turn 1 of a turn
LKR DIX-11S DILZKAR C11H DILZKAR C11S DILZKAR D11S 4 8
SILZKAR F7S DILZKR A11GS DILZKR B10DS DILZKR B11GS
SILZKR C11DS ILKAR K11S ILZKAR E11S ILZKAR F8S （90°） （45°）
R2556G- ILZKAR J8SY ILZKER A4DS ILZKER B4DS
ILZKR B-11S ILZKR B8S LKAR AHX-S
C E LKAR ARX-PS LKAR BGP-S LKAR BIX-11S
CPR EAIX-9 LKR ARX-PS LKR BGP-S LKR BHX-S
CR EGP SILKAR C6DS SILKR A-S SILKR B8DS
CR EIB-9 SILZKAR H6S SILZKBR B8S SILZKGR A8S
CR EKB SILZKR C11S SILZKR F11DS SILZKR F11S
DIMR A10 R2558E-
ILMAR B8
LMAR AI-10 φ10mm（except▼） 1 of a turn（180°） 1 of a turn（30°）
LMAR AP8J 2 12
LMAR DI-10
LMAR F-9 CPR E CPR EA-9 CPR EAGP-9 1 1
LZMAR AI-10 CPR EB-9 CR E CR EB of a turn of a turn
MR BI-8 CR EIA-10 CR EIA-9 CR EIB-10
MR E-9 CR EIX CR EK CR EKA 4 12
MR K-9 CR EKC CR EKPA CR EVX （90°） （30°）
SILMAR B9 DIMR B10 DIMR C10 ILMAR A8
SILMFR A8G ILMAR E9 ILMAR F8 LMAR A-9 1 of a turn 1 of a turn
LMAR AI-8 LMAR AI-8E LMAR AIX-P 6 12
CPR EA-9S LMAR BI-9 LMAR C-9 LMAR CI-8
CR EDX-9S LMAR D-J LMAR EI-7 LMAR E-J （60°） （30°）
ILMAR D8S LMAR FI-10G LMAR G LMAR J-9E
LMAR A-9S MAR A-6J MAR A-J MR AI9
LMAR K-9S MR C-9N MR CI-8 MR D-9
MR B-9NS MR F MR G-9E MR J-9
SILMAR D9DS PMR A PMR B PMR C-H
SPMR A6HDG SILMAR C9 SILMAR E9 SILMAR F9
R0465B- SIMR A9 ZMR A-10 ZMR AP

CPR EAIX-9S CPR EDX-9S CR EDX-S
CR EH-9S DILMAR A11S ILMAR C9D
IMR C-9HES IMR D-9H IMR E-9HES
LMAR ADX-9S LMAR AP8JS LMAR H-9DS
LMDR A-JS MAR B-JDS MR AP8HJS
MR BP8HJS SILMAR A9S SILMAR C9S
SILMFR B8GS SILR A7S SIMR B9DS
R0409B- R0451B- R0451C-

φ8ｍｍ（except▼） 1 1 of a turn（30°）
of a turn（120°） 12
Conical seat type（without gasket） 1 of a turn（22.5°）
3 16
▼ Copper gasket type 1 of a turn（22.5°） 1 of a turn（15°）
16 24

1 of a turn（30°）
12

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