4 New NGK Iridium IX Spark Plugs CR9EIX # 3521 by NGK

Product Information

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:

Aprilia Spark Plug Fitment Chart - Biker Rated Aprilia Spark Plug Fitment Chart - Biker Rated

All three are .4 mm iridium center electrode, 10 mm thread diameter, 19 mm reach, 16 mm hex, .9 mm gap, and 5 kΩ resistor. 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. Spark plugs are often called "hot" or cool or anything inbetween... This has NOTHING to do with how hot the fuel burns. It has to do with how hot the spark plug gets.Fakes are also known to not feature any copper core which means they retain heat and can eventually meltdown, it’s likely to be the same with these fakes.

NGK Iridium Spark plug CR9EIX (3521) | Sparkplugs Ltd

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.This is simply one mistake NGK would never make. If you think of how many of these are sold worldwide, you can see where the problem’s heading. The number of damage reports of snapped CR9EIX plugs and damaged engine heads would soar if worldwide customers tightened down M10 spark plugs to M14 specifications. A colossal recall would then pursue as M14 plugs are actually torqued down around twice as much as M10 ones! It’s important to use a torque wrench because under-tightening can cause overheating due to poor heat dissipation and as mentioned, overtightening will cause damage. This is why you can't 1. hurt your engine with the wrong plugs... you can only hurt your plugs. and 2. Plug slection has no affect on engine performance or horse power... If your plug is fireing during every power stroke... that's the best it can do. Fatter spark, bigger spark, super jiggy spark Doesn't matter... if the fuel/air mix is being ignited every time... that's as good as it gets. Mind you, there are 1000 things that can mess with "fireing every power stroke" but you won't get more power using a "hotter" plug. NGK Iridium Motorbike Spark Plug CR9EIX9 uses the strong metal iridium which offers improvements in starting, idling & throttle response. Features & Benefits: A typical copper spark plug will last around 20,000 miles and most get changed at a major service (usually around 16,000 miles) but an iridium spark plug will be good for around 50,000 miles and you do see people running them to 100,000 miles with no issues. If you need to change your Kawasaki’s spark plugs but you’re not sure of the size or if you want to upgrade your plugs to an iridium version for a longer-lasting plug, this is the guide for you.

NGK Iridium Motorbike Spark Plug CR9EIX9 | Halfords UK

Allows the use of an extremely small diameter electrode (0.6mm) without compromising the spark plugs service life could not get the D one of the manual. I have them on the bike but could be interesting to see a picture. Copper is generally seen as being the best metal to use in terms of conductivity but iridium plugs are seen as premium as they last longer than standard plugs and can be built with smaller tolerances. Iridium spark plugs also have lower voltage requirements, meaning they perform better when starting and idling and some manufacturers also claim they offer a better throttle response. 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 installation guide error on the fakes may cause even more damage if anyone also ends up using thread compound or copper slip. Using such products renders torque readings inaccurate by at least 20% so they should never be used. Modern plugs feature a special zinc coating so they simply don’t need it. NGK released a tech bulletin about this, which you can read in our other article in the link below:

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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. Iridium alloy has extremely high melting point, perfect for todays high-tech, high-performance engines however, if the plug is too hot, the material of the electrode or the ground tab will soften, distort, or even oxidize. A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium. Still not convinced these are fake plugs? One of the best parts of this whole investigation is that we of course found out the fake plugs don’t feature any IRIDIUM tipped centre electrode at all, it’s all LIES.Install each spark plug by hand until you have wound the thread a couple of turns. This reduces the chances of you cross-threading the plug.