Not sure if this is because the old plugs were past their best or if the new ones are better. :dunno Allows the use of an extremely small diameter electrode (0.6mm) without compromising the spark plugs service life 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: If you’re servicing your Aprilia, now’s the chance to upgrade your spark plugs to longer-lasting Iridium ones that will save you money in the long run. 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:

cr9e vs cr9ek vs cr9eix | Suzuki GSX-R Motorcycle Forums cr9e vs cr9ek vs cr9eix | Suzuki GSX-R Motorcycle Forums

so the uber smart engineers calculate that heat transfer path, the average temp for the engine at full throttle and full load, and at idle... proposed engine coolent temp limits and toss in 20% safety margin and then design a plug that will hold self cleaning temps over the widest range of engine RPM, ambient temp, etc. with out ever reaching "burn out" temp and volia' you have a plug for your specific engine. A spark plug fouls with every single power stroke of the engine, as the fuel burns a deposit of soot forms on the electrode. Form enough deposit, the gap resistance changes and the plug either is resisted out or shorted out, neither of which will fire the cylinder. If the plug is brown or light grey your can assume your engine is in good condition and the spark plug is functioning well. Even when a plug is in good condition small deposits will accumulate. This is normal. Rich PLEASE NOTE – This article was written a few years ago so not all information provided may be accurate. For example, on some part numbers, NGK now uses Laser Etching instead of stamping, so the font information may not be accurate. Another Sparking Discovery And so, if your plugs are working, they reach the self cleaning temp, your wires are not leaking, your plug caps are properly connected and intact... you are good to go.Motorcycle spark plugs usually last around 16,000 miles, or at least this is when most manufacturer service schedules recommend you change them. That's typically once every other major service. However if you use Iridium spark plugs they will last a lot longer, usually well over 30,000 miles. Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines

Kawasaki Spark Plug Fitment Chart - Biker Rated Kawasaki Spark Plug Fitment Chart - Biker Rated

As stated above, the illustrations on the rear show installation procedures for an M14 threaded spark plug. Unfortunately for Mr Counterfeit, CR9EIX spark plugs have an M10 sized thread! This fatal error has already fulfilled our suspicions that they’re indeed fake, and we haven’t even seen the plugs yet! Fake plugs are known to have air bubbles trapped inside the white ceramic insulator which can affect heat dissipation capability. I think, don't quote me, but I think the difference between the CR9EIX and the CR9EIA-9 is dual electrodes.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. A regular spark plug uses a copper central electrode whereas an iridium spark plug uses, you guessed it, iridium.