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This procedure will help get the correct adjustment.  When adjusting to .003 and you think you've got it right, put the .004 feeler gauge in.  It can go partially in between, because of the parts are beveled, and due to the rocking motion of the rocker arm, it tends to round the surfaces a bit.  The .004 may slip in a little ways, but won't go through.  When you get it as the example above, you know you've got a good adjustment.  Note:  exhaust adjustment is .003 and checked with .004 - intake is .002 and checked with .003 ('70-'77 CB750/may or may not apply to other models)

During the adjustment, you don't need the lock-nut sloppy loose, but enough to do the adjusting.

Now tighten the lock-nut...be sure to hold the adjustment screw in place with a well fitting screwdriver.  You may find that it has tightened up when you check it, afterward.  If you have to, redo it with the .003-.004 procedure until it's right.

In the pictures below, you see other matching valves.  2 and 3 intake - to the right and, 2 and 3 exhaust below.  Follow the same procedure turning the crankshaft clock-wise until the opposing valve (the one you're not going to adjust) fully opens and stops.  And then the 1 and 4 intake.  Do them in any order, it doesn't matter, just adjust each set of matching valves and you'll get the most accurate adjustment possible.

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