Bad Boy MZ 42 Owner's, Service & Parts Manual page 25

3.4 Changing the spark plugs and checking the spark plug gap:
1) In order to access the spark plugs you will need
to remove the rear engine cover. This can be
accomplished by removing the two carriage
bolts using a 7/16" ratcheting wrench in the
back as well as the two connecting the rear
engine cover to the plastic shrouds. Then loosen
the two carriage bolts on the side and the rear engine
cover will swing down for easy access to the spark plugs.
2) Remove the wire on the spark plug and use a 5/8"
socket to remove the spark plug.
3) Check the gap on the spark plug to verify that it is 0.03
in using a feeler gauge.
4) If the spark plug is worn, overheated, wet or carbon
fouled replace the spark plug.
5) Install the plug into cylinder head and torque
to 20 ft*lbs. be careful not to overtighten the spark
plug
PAGE 25