Wisconsin VH4(D) Magneto timing:
1) Identify and remove #1 spark plug
2) Rotate engine by hand clockwise looking from front
3) With finger over #1 spark plug hole you will know when piston is coming up on compression stroke
4) Continue until mark on flywheel is at vertical centerline
5) Remove inspection bung in front of magneto
6) Remove distributor cap from magneto and place the rotor at about the 2 o'clock position looking from the rear
7) Identify the gear tooth with the 'x' stamped onto it
8) Assemble magneto to engine with the 'x' tooth visible in the bottom half of the inspection hole
9) Firing order is 1-3-4-2. Wires are solid wire core and are easily traceable using an ohmmeter with one lead at each end of the plug wire.
10) #1 marked terminal is at the top RH (~2 o'clock) position when looking from the rear. Rotation for the 1-3-4-2 firing order is clockwise
(Magneto point gap calls for .015". Spark plug gap calls for .030". For long mag life set plug gap to .020" or .025".)
(If engine may sit idle for a long time, get in the habit of rotating the engine enough to make the impulse trip. The points will be open and there is less chance of the points oxidizing.)