which spark plug to use

LAWN-BOY recommends the use of the Champion CJ-14 spark plug.

Plugs should be cleaned and gapped every 25 hours of operation.

The correct gap for LAWN-BOY engines is:. D-400 SERIES .025" D-600 SERIES .035"
 
I'd personally recommend an NGK plug over the Champion. Look for a BM4A or a BM4Y plug. The engines I've had over the years always seemed to run better with an NGK plug in them...

L8R,
Matt
 
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