Champion and NGK Spark Plugs
Franz and Grubb Engine

Champion and NGK Spark Plugs

Regular price $7.49 $0.00

 The right spark plug

The right spark plug for your Triumph is as important as any other part of your ignition system. As a general rule, Triumph 500 / 650 / 750 aluminum heads use a 14mm 3/4" reach plug. All Triumph iron heads use a 14mm 1/2" reach plug. Pre unit square barrel TR5 and 500 Grand Prix also use 1/2" Finding the correct heat range is up to the individual tuner.

Important note about heat ranges

Champion spark plugs heat range increases as the number gets higher

Champion (higher number=hotter plug)

NGK spark plugs heat range decreases as the number gets higher

NGK (higher number=colder plug)

Reading spark plugs can be challenging with lead free ethanol added gasoline. Please use caution with a major change or new engine and always use a fresh set of plugs when tuning for speed.

Spark plugs are sold in pairs or as a pack of four.

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