need plug number

GoldenMotor.com

trackfodder

Member
Sep 8, 2008
347
3
18
I tried to replace the plug on y 66c Gru Bee and the plug number doesn't transfer. The usual China crap stuff. Has anybody managed to fit a suitable heat range plug? What number, please.
 

DaveC

Member
Jul 14, 2010
969
1
18
Boise, ID
B7HS is a little cold when you consider a B5HS is in the same heat range as the Chinese plug. Yes, it will work but will be more prone to fouling due to not enough heat. Colder plugs are used when you raise the compression by milling the head or going to the Manic Mechanic heads or Puch heads which also raise the compression.

BR5HIX is the NGK Irridum plug, kinda expensive but I really liked mine and got another for my Morini.