Glass Spark Plug

[bajagokart]

pretty sure blue is the hottest

 

[Russ2251]

Blues are the hottest

 

[Daveon]

Blue is good
http://www.gadgetjq.com/ctune.htm

 

[Daveon]

i thought of looking them up here, but he didn't have any distributer's links

http://motors.shop.ebay.com/i.html?_nkw=colortune&_armrs=1&_from=&_ipg=&_newu=1&_sop=1