what plug in an '04 rm125?

[reknelb]

Anyone know what plug you're supposed to run in a new rm125? A buddy's brother just picked one up and said his bro spent $25 on a plug from the dealer. He said it was some special kind of plug???? My plugs cost $2.10 so I'm cornfused.

 

[uts]

NGK R6918B-8

Got this from NGK and a motocross sight. What the hell happened to the old b8es etc
These new named plugs are freakin me out.

 

[marcusgunby]

they are fitted to resist detonation that can occur, if the bikes detonated slightly a std plug breaks the ground stap and all hell brakes loose, i had it happen on a 03 kx125-very expensive, i now use the expensive plug.