Hopefully one last bit of clarification on my Pazon install

I have a 73 Commando and Pazon says: For Norton Commando 1972/73 models, there are two marks; use trhe mark indicating TDC with the pistons at the top of the stroke.

What do they mean for me to do here? Do I set the pistons at TDC and then see what degree the mark is on or what? And if so, then what?

Thanks for any help on this.

Yellow_Cad said:

I have a 73 Commando and Pazon says: For Norton Commando 1972/73 models, there are two marks; use trhe mark indicating TDC with the pistons at the top of the stroke.

Click to expand...

Yes, that doesn't make much sense, and I don't know why they refer to 1972/73 models specifically, but presamably they mean "use the 28 degree BTDC (but set it to 31 degrees for Pazon) alternator rotor mark", as there are normally two timing marks on ther rotor 180 degrees apart, and neither mark is at "TDC" (0 degrees).

If you were to set the wrong rotor mark at the 28/31 degree position on the timing scale then you would be setting the crank 28/31 degrees before bottom dead centre.

Remove both spark plugs, remove the timing inspection plug on the primary cover, remove the ignition rotor/stator cover.

Stick a pencil or screwdiver in the left plug hole.

Sit on the bike, lean over and peer through the timing inspection hole as you slowly bump the kickstarter.

You'll see the pencil or screwdriver start to rise, and you'll see the raised pad on the alternator rotor with the line (mark) in the center atart to come into alignment with the timing scale in the primary cover. Bump the kicker VERY gently now, and stop when the mark aligns with the tic mark relating to 28 degrees.

Now, carefully rotate the electronic ignition rotor until either end of it is more or less aligned with the 9 o'clock position. Place the stator plate in place and snug up the two pillar bolts GENTLY; align the stator at a point where the two pillar bolts are in the center of the adjustment range cutout slots.

Next, make the final alignment of the ignition rotor such that the little white painted do on the rotor magnet is just aligned with the 9 o'clock window on the stator plate, then carefully and fully tighten down the rotor fixing allen screw. Lastly, tighten down the two pillar bolts on the stator.

If you have a good battery, good fuel, and valves & carbs properly adjusted, the bike SHOULD fire right up and run just fine. Strobe timing should then be a simple matter of only a few degrees adjustment of the ignition stator plate to fine-tune it to the ignition manufacturer's recommended setting.