5-73. DECOMPRESSION RELEASE - Continued
If the screw is tightened more than 1 turn, the exhaust valve
could hit the piston.
With the piston 10° to 450° past TDC on the power stroke, hold the arm in the decompression
position (tension against spring). Loosen the lock nut and turn the set screw so it just touches the
exhaust rocker arm. The release arm must be tight against the snap ring during adjustment. Then
turn the screw exactly one revolution clockwise. Original factory setting marked with white or
Hold the set screw and lock it in position with the lock nut. Turn the nut hand tight plus 1/4 to 1/2
turn to lock the mechanism.
Release the mechanism to allow compression. Check the clearance between the screw and rocker
arm. Insert a feeler gauge between valve and rocker arm to take up valve clearance for this check.
If there is no clearance, back off the set screw until it just clears the rocker arm.
When reassembling the rocker cover, remove the solenoid, dip the plunger O-ring in oil and
reinstall when cover is on the engine. Align solenoid so terminal "SW" is above terminal "IGN".
d. Follow-on Maintenance.
Connect batteries (see para 4-114).