Changing plugs....how often?

[Bigprairie1]

Ok, this is bit of a take-off on the previous Champion vs. NGK post.
However...how often (hours or outings) do you change the plugs in these two strokes?
Mine is 90'/90hp and I'm starting to wonder if I'm due since I changed them in early June. Since them I've been out about 25 times and have logged probably about 40-50 engine hours.
Any takers on this?

 

[MikDee]

Re: Changing plugs....how often?

IMO if they still look, and perform okay, why bother. These surface gap plugs are hard to figure when to change. I'll probably change them at the beginning of next season, unless they start to misfire on me.

 

[roscoe]

Re: Changing plugs....how often?

Take them out, check the center electrode for wear.
Wipe them off and put them back in.