To find a colder plug, it varries from company to company. I know NGK plugs backwards and fowards though.
With NGK the LOWER the first number number, the HOTTER the plug. The HIGHER the first number the COLDER the plug.
The Stock NGK's for the Beta motor are "5"'s. I run "7"s due to the turbo.
The second number with NGK is the plug gap in MM. so 11 = 1.1 mm 8 = .8 mm
Here is the plug decoder sheet for NGK plugs (need adobe acrobat reader)
http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf
They also have LOTS of good plug info on the NGK website.
http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp
Each plug manufacturer has their own web page, and their own decoder system. I suggest you check them out to find out how to decode your favorite brand. I'm an NGK V-power man myself.
Not EVERY auto parts store is going to have every plug. I use www.clubplug.net to order sparkplugs. You must order them in batches of 10 or 20, which is a pain, but their prices are cheap, and they carry most name brands. Just remember they are in Canada.
If you want more info and an informative read on sparkplugs...check out
http://www.canadiandriver.com/articles/jk/at_001024.htm
Any more plug type questions?<img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>
<hr width=60% noshade size=1 align=left>quote from 4DoorGL: <b><i>"Told you. Random is cool as hell in person, even if he is a dick on the net <img src=/images/forums/snitz/wink.gif width=15 height=15 border=0> (j/k)" </b></i>
Leave it to Random to Needlessly complicate things.