View Full Version : DPR 8Z or 9Z ?
promisc
08-08-2003, 02:04 AM
My dealer give me a DPR8Z when i ask them for a 400ex sparkplug. Is the DPR9Z better than 8Z? Also, how to correctly gap the plug?
Silverfox@C&DRacing
08-08-2003, 03:02 AM
We just talked to JE Pistons about this. They said for the big bore kits you need to run a cooler plug. I am going to try the DPR9Z. if you still have stock compression I would run the 8 plug.
YLW400
08-08-2003, 03:04 AM
I agree with Dusty, I tried running a 9Z for a while, and I kept fouling them. I went back to 8Z, and haven't had a problem. By the way, I have stock bore..
YZROOSTINYA
08-08-2003, 03:16 AM
I run a 9 in the summer and 8 in the winter
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