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View Full Version : dpr9z? dpr8z? plugs


honda400ex1999
02-17-2009, 08:01 PM
what plug is better to run on 9z or 8z .
02-17-2009, 08:10 PM
what mods and where do you live? I just switched to a 9 but i havent had a chance to see how it runs yet. Its good for high compression, advanced timing, over bores, high speed riding, and hot weather. If you have any of those I would say switch
Wheelie
02-17-2009, 08:22 PM
IMO--Internally stock motor, cam being an exception--8z

High compression, big bores, etc--go with 9z
honda400ex1999
02-17-2009, 08:37 PM
i live in south texas and do not have many mods on the motor except white bros e series full exhaust , 155 main 38 slow , amr rev box stage 2