[Ken Huber]

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?

 

[Moe]

I have a Yamaha F225 and change the plugs every spring after running it for a few hours on the initial shake down. Can be done very easily even with the boat in the water.

 

[TheAdamBomb]

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.

 

[barnaclebillsmarine]

4 Strokes should be done at appox 2 years or 300hrs. Unlike your car they are sparking much more as your RPM's are turning well over 4,000 rpm unlike you car that is only 1500 rpm's.

 

[Ken Huber]

Appreciate the come back. I have a hundred or so before I replace them. Thanks again.