put in wrong heat plug, should I worry

4 replies to this topic

Posted October 20, 2006 - 03:27 PM


the plug on my 426 died today, and I accidently replaced it with my dad KFX 400 spark plug, a NGK CR7E. I noticed this after I started it up and took it up and down the street. the stock spark plug for the 426 is a NGK CR8E, one heat rating higer( I guess). should I worry about this. will it hurt the engine.

  • Fastest1

Posted October 20, 2006 - 05:10 PM


It shouldnt hurt anything, it mostly refers to keeping the plug clean. It might foul earlier or not but it wont hurt the engine or make it run hotter or cooler.

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  • 02YZ426

Posted October 20, 2006 - 05:31 PM


For the price of a spark plug.. I would change it up soon as you get the chance. I doubt it will hurt the engine though..

  • grapeape

Posted October 20, 2006 - 05:43 PM


the 7 is hotter than the 8, but I can't say what is going to happen either.

  • grayracer513

Posted October 20, 2006 - 09:28 PM


What could happen in a four-stroke is that the plug may get hot enough to become a source of pre-ignition, which can lead to detonation and possible engine damage if serious enough. I'd change it as soon as feasible.

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