spark plugs 701

Location
Michigan
been trying to tune in my carbs on my sj. when i do plug chops, and the plug is only turning colors around the tip of the white porcelain but the front plug all of the white porcelain turns color? why is that?
 

Half flip95

Formerly pondracer95
look at that dawg! nice rot!

A seadoo racer I randomly ran into at the local pond, Jonathan Riviera, helped me dial in a 750sx i had just put a sbn 44 on. It was my first time really messing with carb settings. We did a series of plug chops to determine what to set my screws at. Later that year i put a pipe on the ski and tried to repeat the process on my own. Those pistons didn't survive the summer.
 
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