Quote:
Originally Posted by Jmcgee
I have some "Race only" plugs without the electrodes/ground straps on them, never used them in my ninja but I was going to till it broke. I was told they were slightly longer and grounded to the piston. Never measured them and have no idea why they are labeled race only....
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That sounds a bit too close to the piston, I'd be afraid of those. And if they're labeled as race plugs then they aren't suitable for normal use, plenty of small changes they'll make to those plugs tweaking them to work best in certain situations. Some of them are designed to intentionally melt certain parts if cylinder temps are dangerously high from accidental lean or detonation conditions. It said they'll just foul out after this, killing the plug but saving your piston from melting.