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Condition:
NewNew
Shown below is an over torqued spark plug that sheered due to user installation error. NGK states that incorrect torque values are responsible for up to 90% of all spark plug warranty claims. Incorrect torque can also result in poor engine performance, read below.
Recommended by an Austin Seven owner for the engines where the standard plug used in the high compression head tends to soot up - the projecting nose and slightly hotter rating is said to cure this.