Originally Posted by hdm2002
I have a VH4D with a Magneto I changed the points. Now I need help timing the Mag back to the engine. What is the firing order? What is the rotation for the mag? Any help would be great.
Once you have the mag timed to the engine. Place the engine at top dead center for number 1 cylinder (TDC). To do this remove spark plugs and rotate engine in the direction it normally runs. Place thumb over spark plug hole Number 1 while turning the engine. When there is pressure against the thumb and air is forced out the spark plug hole the engine is on compression stroke for #1 cylinder. Continue to rotate the engine until the zero degree timing mark is lined up with the timing mark on the flywheel.
Without the engine running the points should open just before or at TDC. Place a continuity light checker across the points and rotate the magneto back and forth until the light goes out. At the point that the light goes out while turning the engine in the proper direction the spark should fire for number 1 Cylinder. Rotate the magneto housing so the light goes out at TDC. This should be good enough to start the engine.
Start the engine as the engine speeds up the timing should advance. Check with timing light. If it does not change check the timing advance mechanism.