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To begin the valve adjustment, I set the number 1 piston to Top Dead Center (TDC) on it's compression stroke. To do this, I used a 19mm socket on my breaker bar and rotated the crank bolt clockwise until the notch on the crank pulley lined up with the "0" mark on the oil pump cover. When the number 1 piston is at TDC and on the compression stroke, both of the intake and exhaust rocker arms should be loose (in the picture I am actually able to slide rocker arms off the cam lobe - this is loose). If they are not both loose, you must rotate the crankshaft bolt 360 degrees since you are not on the compression stroke.
The valve clearances are as follows:
Intake 0.20mm (0.008in)
Exhaust 0.30mm (0.012in)
Adjust number 1 and 2 intake valves and number 1 and 3 exhaust valves to the indicated specs. To do this, I loosen the lock nut, insert the proper feeler gauge between the rocker arm pad and the valve stem. Turn the adjusting screw with a screwdriver until there is a slight amount of resistance or drag on the feeler gauge. Hold that setting with the screwdriver and tighten the lock nut. Slide the feeler gauge out and make sure there is still a slight drag to it. If not, repeat the above step.
Once the first set of valves have been adjusted, I rotate the crank pulley 360 degrees until the number 1 piston is again at TDC and the timing mark is at the "0" as mentioned earlier. The number 1 piston is NOT on the compression stroke. Now I adjust the number 3 and 4 intake valves and number 2 and 4 exhaust valves to the indicated specs. I reinstall the the valve cover, the hoses, and the air cleaner assembly and I am all done.
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