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Changing plugs on this unit is not difficult.
Remove the plug wires from the spark plugs.
Use the proper size spark plug socket (13/16"), and remove the old plugs.
Gap the new plugs to .025", and screw them in. Torque them to 18 - 25 ft-lbs.
Snap the plug wires back on the plugs.
The #2 (right hand) spark plug is located directly behind the right valve cover.
The #1 (left hand) plug is located behind the left valve cover, which is behind the air intake box. You can not see it without a mirror, but you can easily feel it with your hand.