Hello all of you.
I have also been reading about different sparkplugs and from what i have read iridium is the newest sparkplug material and there should bee some good things about this.
From what i have read the "normal" NGK CR7HSA which is used in many scooters can be switched for a NGK CR7HIX if you want a NGK with iridium.
You can also use Denso IUF22 which should be the smallest centerelectrode tip in the world, its only 0,4 mm compare to 2,5 mm on standard plugs.
Check my page about sparkplugs :
http://mentos.wep.dk/scooterhjemmeside/tandror.html(theres a link for google translate on the right top of page id you want to understand the text.)
Go down to Iridium for iridium info:
http://mentos.wep.dk/scooterhjemmeside/tandror.html#iridiumAnyway i read in a denso manual that a Honda Dio 2 stroke running at 30 km/h went 2 km more per liter of fuel (5% longer).
If its realy true that you go longer for the same amount of fuel then the extra money spent on a iridium plug would more back to you and in the end its cheaper to buy a iridium.... given that its true.
The Denso IUF22 (can be used instead of NGK CR7HSA) is in the plug series called "iridium power" by denso and they should late 15000-20000 km with out any adjusting.
Denso writes that you should not adjust the electrode because one might damage the sharpe edge of the tip, but if you adjust you should be carefull.
Check
http://mentos.wep.dk/scooterhjemmeside/download/tandrror_iriduim.pdf if you want to read the details about iriduim use in sparkplugs.
Also check :
http://theodoregray.com/PeriodicTable/Elements/SparkPlugsGroup/index.s7.html interesting reading about what materials have been use in spark plugs. Firestone have made sparkplugs with radioactive polonium.
Why is iridium used in sparkplugs you ask ?
Course it have a high melting point and is very strong... this makes it posible to make a very small tip (the smaller the tip the more easily the spark will jump and the less voltage is required) and also there is not removed so much material with each sparks compared to standard plugs with nickel.
