The downside though is their cost as the fancier metals cost a fair bit more, plus you pay the extra for buying a ‘premium’ product. The other advantage is that they should theoretically last longer than a standard plug as the electrode metals are less reactive and hence less prone to wear.
By using metals such as platinum or iridium (rather than the standard copper), the central electrode can be finer so that the voltage doesn’t need to be quite so high before the spark can form. There are also various ‘performance’ models of the above plugs available which use different materials for the centre electrode. Introduction to spark plugs for classic motorbikes.This spark plug guide contains the following sections:
I’ll come back to the matter of finding an appropriate spark plug in India at the end of this guide, but first I want to go through the various modern-day plugs that could be used in my Matchless where available. But in order to find an alternative, I first needed to decode the various manufacturers spark plug numbering systems in order to match up the specifications with something resembling the original KLG FE80. This seemed reasonable enough to me at first they’re all 350cc singles after all! But then I realised that the Bullet plugs only had 1/2″ of thread whereas my Matchless requires a longer 3/4″ reach in order to protrude correctly into the combustion chamber.Īnd this is how my search for a more appropriate spark plug for my Matchless G3Ls began. The accepted wisdom in the Hyderabad classic bike community was that the plugs made for Royal Enfield Bullets (usually something like a Bosch W145Z1 or W175Z1) could be used for many old British bikes. Try doing this for a Matchless though and you’re only met with blank stares! If you needed a plug for your Honda motorbike, you just go to the Honda dealer and ask for a plug for your model and they will give you the appropriate one. Also those that were available often seemed to have strange codes that didn’t fit with any of the numbering systems I was used to from back in the UK. The problem was even worse when I was living back in Hyderabad, India as the models of spark plugs available was very limited. It can therefore be tricky to know what type to install.
#Ngk spark plug number decoding manual
Spark plugs have changed somewhat in the decades since these old bikes were built and the brands and models listed in the original owners manual may no longer be readily available. The humble spark plug is obviously quite an essential part of any Matchless engine and is the one component that usually even the most non-mechanically minded will happily fiddle with.
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