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Explanation For Installing Plugs

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V-Groove Center-Electrode Spark Plugs

Plugs installing torque table

Plug Type Flat Seat(with gasket) Taper Type(without gasket)	Iron cover		Aluminum cover
Plug Type Flat Seat(with gasket) Taper Type(without gasket)	(N.m)	(kgf.m)	(N.m)	(kgf.m)
10mm Flat Seat	10~15	(1.0~1.5)	10~15	（1.0~1.50
12mm Flat Seat	15~25	（1.5~2.6）	15~26	(1.5~2.6)
14mm Flat Seat	20~40	(2.0~4.1)	20~30	(2.0~3.1)
14mm Taper Seat	10~20	(1.0~2.0)	10~20	(1.0~2.0)
18mm Flat Seat	35~45	(3.6~4.6)	30~40	(3.1~4.1)
18mm Taper Seat	20~30	(2.0~3.1)	20~30	(2.0~3.1)

If there is no torque wrench available, please install new plugs per the following table while old ones with one twelfth circle(30°)

Screw the plug to the datum mark hand	M14 and m18 Taper seat plug	M14 and m18 Flat seat plug	M12 Flat seat plug	M10 Flat seat plug

Datum mark	1/16 Circle(22.5°)	1/2 Circle(180°)	3/8 Circle(135°)	1/4 Circle(90°)

Pay attention to the matching between the valld length of plugs thread and the thread length of the Installation hole of cylinder cover

The thread of plug is too long	Forget to install gasket	Correct installation of one gasket	Correct installation of one gasket	The thread of plug is too short

Touch pistion Dirt deposits around the stretchy part Of thread It is difficult to Replace spark plugs The side wire to Be over-heat.	Leakage of the Combustion gas Lose power Poor conductibility Over heating spark plug. Pre-ignition.	Normal ignition Without abnormality	Waste gas deposits round the ignition end and affect the ignition feature. Dirt aeposits around the lower part of the instauation hole	Waste gas heavily deposits around the ignition end and probably cause no fire. Dirt heavily deposits around the stretchy part of thread. It is difficult to replace.