Hello:

Just bought a new Toro Lawnmower (self propelled)
Have about 1/4 acre of grass, which I expect I'll be mowing about once a
week in July and Aug.

Was wondering:

How often should I consider replacing the spark plug ?
Once per season, or... ?

Wouldn't really want to wait until there is some sign that it needs it;
would rather do it on a
preventative maintence concept, before it really needs it. What's
reasonable ?

Also, the same question for a 2-cycle engine weed wacker.
How often do you think for this gadget ?

Thanks,
Bob