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How often do you all change spark plugs in your 4 strokes? My cars probably get changed every 100 thousand. Is there a big difference in the two?
 

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Ken, I put 700 to 800 hours per year on my Yamahas, and change the plugs between 300 and 400 hours. I just changed them out with a bit more than 300 hours and they still looked GREAT! 4 strokes are MUCH easier on plugs than 2 stroke engines.
 
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