Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Mentioned: 7 Post(s)
The CR9EK is a regular double ground electrode plug. I had one in my Yamaha WR426F, then switched to NGK iridium Big improvement, and notable difference in exhaust note.
Stick to iridium spark plugs NGK CR9EIA-9 (0.6 mm diameter iridium centre electrode) or Denso IU27 (0.4 mm diameter iridium centre electrode) as recommended, for a low wear rate providing stable idle, superior anti fouling, improved fuel efficiency, lower emissions, and a more dependable spark for less strain on the coils over plug and the catalytic converter.
Last edited by invader; 12-15-2009 at 09:07 PM.