plug gap is 20 thou, or the thickness of a normal hacksaw blade
try the plug in another engine
BEWARE IF TESTING FOR A SPARK WITH PLUG HELD AGAINST
CHAINSAW ANY FUEL SPITTING OUT OF PLUG HOLE WILL SET
THE MACHINE ON FIRE
fit another plug into plug hole whilst testing for spark.
sounds like stale fuel causing your problem
pumpkin man, March 2007