3-11. Spark Plug Service
f. Install the spark plug and tighten to a torque of
250 to 300 lb in. using a 13/16-in. deep socket and
a. Prior to removing the spark plug, use a 3/4-inch
open end wrench to loosen the shielded ignition cable
connecting nut. Unscrew the nut and separate the cable
g. Insert the shielded ignition cable end into the
from the spark plug.
spark plug and tighten the connector nut with a 3/4-in.
open end wrench. Do not over tighten.
b. Using a 13/16-inch deep socket wrench, remove
the spark plug.
3-12. Governor Speed Adjustment
c. Inspect the spark plug and clean or replace as
After each 50 hours of operation, check the speed of
d. Clean the spark plug by wire-brushing and by
digging out carbon around the insulator with a sharp
meter. The proper speed is 400 rpm and the frequency
is 400 cps. If adjustment is required, proceed as
e. Using a 0.030-inch feeler gage, set the spark