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Top > Race Information > Racing Spark Plugs > Installation
To install spark plugs in the engine, first tighten them by fingers, then retighten with the right tightening torques as shown below, using a plug wrench.
Either excessive tightness or looseness will cause troubles. Looseness sometimes causes pre-ignition because heat cannot disperse. On the other hand, excessive tightness can damage the threads of both the cylinder head and the spark plug.
Tightening angles
| Thread size |
New gasket |
Used gasket |
| Φ14mm(except*) |
2/3 of a turn (240) |
1/12 of a turn (30) |
| Φ12mm,Φ10mm |
1/2 of a turn (180) |
1/12 of a turn (30) |
| Φ8mm |
1/3 of a turn (120) |
1/12 of a turn (30) |
| *R6469-9 R6918C-9 |
1/3 of a turn (120) |
1/12 of a turn (30) |
Tightening torques
| Spark plug type (thread diameter) |
Aluminium |
Flat seat type
(with gasket) |
Φ14mm |
25-30N.m
(2.5-3.0kg.m 18.0-21.6 lb.ft) |
| Φ12mm |
15-20N.m
(1.5-2.0kg.m 10.8-14.5 lb.ft) |
| Φ10mm |
10-12N.m
(1.0-1.2kg.m 7.2-8.7 lb.ft) |
| Φ8mm |
8-10N.m
(0.8-1.0kg.m 5.8-7.2 lb.ft) |
NGK Spark plug covers for racing spark plugs
| Plug cover number (Colour) |
Applicable plug type and cable |
TRS1225 (Blue)
For Honda Racer only |
R7282-,R7282A- , R7282C -, R7282M- |
Φ8mm cable |
TRS1233A (Red) TRS1233B (Yellow)
TRS1233C (Green) |
R7282-,R7282A-, R7282C-, R7282M- |
Φ7mm cable |
| TRS1408F (Blue) |
R5300A-, R5300N- |
Φ8mm cable |
| TRS1409 (Red) |
R5540F- |
Φ7mm cable |
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Racing Spark Plugs
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