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Carburetor Information
U.S. CB750 Models 1969-1978
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Static and strobe timing an old houndog CB750 - Pg 4
Once you have the timing plate set as close as you can for jugs 1-4 tighten down the timing plate screws, reconnect the two wires to the points, and use the same process for the smaller timing adjustment plate for 2-3 points (image below).
Again, the screws for the 2-3 timing plate should be lightly snug, not loose and not tight. Turn the crank 180 degrees so the 2-3 F mark shows through the peephole and are lined up.
Tap the plate all the way down (shown above) and then tap it back until the meter needle moves. Turn the crank a little both ways to check.  When it's as close as it will get tighten the screws, re-connect the wires and you're ready to fire it up and finish the timing. Oh, and if you took the plugs out to make turning the crank easier now's a good time to put them back in. ;-)

This will only get you close and seldom does static timing hit dead on. These bikes are almost if not more than 30 years old, and as a result many have weakened springs on the timing advance units. Often the timing will wind up a bit advanced even at idle which can make for rough idling and hard starting, not to mention sluggish take-offs from a stop. On to strobe timing...

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