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How do you guys take a plug reading? I am trying to pick the right main jets for my 99 ZRT800, but I can't seem to get a good reading.
I'm installing new plugs, then going for a 1000' wide open blast, then hitting the kill switch as I take my thumb off the throttle. I don't get any color on the center insulator that way. Should I bee looking down the hole at the piston?
Thanks for any help,
Scott
PS I running 390s with a Power Breather and a D&D silencer at 30 degrees and 500 feet when I'm checking the readings...
I'm installing new plugs, then going for a 1000' wide open blast, then hitting the kill switch as I take my thumb off the throttle. I don't get any color on the center insulator that way. Should I bee looking down the hole at the piston?
Thanks for any help,
Scott
PS I running 390s with a Power Breather and a D&D silencer at 30 degrees and 500 feet when I'm checking the readings...