- 1). Remove both spark plugs with a socket wrench and spark plug socket. Shift the transmission into first gear. Place the motorcycle on its center stand.
- 2). Use a wrench (preferably a crescent wrench) to remove the cap located behind the cylinders, underneath the carburetors. Inside the hole is a threaded stud with a lock nut on the end. Inside the stud is a small pin, which should be even with the end of the stud. If it is not flush, it needs to be adjusted.
- 3). Rotate the rear wheel forward. While rotating the tire, the pin should move in and out an equal distance in both directions. Stop turning the tire when the pin is in the middle of its stroke. Loosen the lock nut with a wrench and turn the stud until the end is even with the end of the pin. Tighten the lock nut and replace the cap. The cam chain is now adjusted.
- 4). Look into one of the spark plug holes using a flashlight. Turn the rear wheel until the top of the piston is visible in the spark plug hole. The engine is now at top dead center.
- 5). Remove the valve covers using a crescent wrench. Four valve covers are located on the front and back of the two cylinders; three are round and the left front cover is square. The exhaust valves are at the front of the cylinder and the intake valves are at the back.
- 6). Adjust the valves on the cylinder at the top of its compression stroke, which is the one with the closed exhaust valve. Insert a feeler gauge of the correct thickness between the rocker-arm bolt and the top of the valve stem. The clearance is correct when the next size up feeler gauge will not fit in between. Adjust using a crescent wrench by turning the bolt on the top of the rocker arm counterclockwise to tighten or clockwise to loosen. Bring the other cylinder to the top of its compression stroke and repeat. Remount the four valve covers.
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