If you’ve not changed your plugs before, give yourself a couple of hours to complete the task. Here are the essentials you need for smooth re-plugging: The NGK Iridium IX Spark Plugs utilise a 0.6mm laser welded fine iridium tip which ensures high durability and a consistently stable spark along with a tapered ground electrode which minimizes electrical quenching effect. The longer insulator nose prevents fouling, the corrugated ribs on the insulator prevent flashover and a triple gasket seal eliminates combustion gas leakage. Most engine designs will respond favorably to a plug with better ignitability. If you don't notice a difference using your five senses - then probably only a gas analyzer will show the improvement. If that is the case, and you don't care how long it is between your plug replacement intervals, then don't bother spending the extra money. A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium.

Iridium alloy has an extremely high melting point, perfect for today’s high-tech, high-performance engines As I understand it, pre-ignition is just that, normally caused by a hot spot in the combustion chamber, bit of shit or too hot a plug that glows red and ignites the fuel/air mixture before spark. If you’re going to be doing any sort of work on the bike, treat yourself to a decent set of tools. Most of mine are from the Halfords Advanced range (formerly called Professional).The improved throttle response, superior anti-fouling and high ignitability are what makes Iridium IX ideal for the performance enthusiast. You’ll need this to help you find the location of your spark plugs and how to access them. This may sound simple but often the manual offers up some time-saving tips for your particular model.

This change of mind return policy is in addition to, and does not affect your rights under the Australian Consumer Law including any rights you may have in respect of faulty items.

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A spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. This is called “Thermal Performance”, and is determined by the heat range.

If the engine is running dangerously lean the whole plug tip will be grey or white. If the temperature is over 850-degrees, pre-ignition may occur. Engine power will be reduced and you risk piston damage. Each and every spark plug manufactured by NGK is designed to meet the most rigorous standards, ensuring there ability to deliver reliability and consistent performance under all conditions. Each plug plays a major role in helping improve performance, fuel economy and the overall optimum efficiency helping to make a significant contribution in the reduction of emissions. If someone has "high motor temperatures" then they have more to worry about than the firing end design (or material) of their spark plugs. OK The image of the spark plugs above shows four common conditions that you’ll find your spark plugs in. From left to right the plugs are Normal, Rich, Lean and Very Lean. Full descriptions below. The metal in a spark plug has a single purpose: to channel the electrical energy through the spark plug. Iridium is far harder than copper and this allows the spark plug manufacturers to create a plug with a sharper ‘tip’ which better focuses the spark around the centre electrode without compromising its service life.

Torque the spark plug up to your manufacturer’s recommended settings. If you don’t have a torque wrench, then get the plug hand tight and then add a ½ turn for a plug with a gasket, and more like a ¼ turn for a tapered spark plug. Over-tightening can snap the spark plug – a nightmare. I don’t agree, the main reason for plugs to have a heat range is to keep um clean. When a plug runs at the “correct temperature” is far less prone to fouling, go to hot it can result in pre-ignition but if your plugs are fouling up, going up one on the heat range is advisable, misfiring is not good for engines. This nifty little tool only costs a few quid and will help you set the correct gap for your spark plug. However, modern plugs are almost all motorcycle-specific fit and so they come ‘pre-gapped’ and you won’t need to touch them. If you’re running a classic bike, you’ll probably need to set your gap and if your bike’s not running right, a gap tool can help you rule out a potential incorrect gap issue. Err kind of agree, as I was told, there are two parts to the electrode, one which is made from steel. Steel conducts electricity and is magnetic but is it gets too red hot it becomes austenitic, doesn’t like to conduct electricity and becomes nonmagnetic so becomes more an insulator. This is safety for your engine because it will promote a miss and cool the motor down. Allows the use of an extremely small diameter electrode (0.6mm) without compromising the spark plug’s service life