.020
no points , electronic
i do mine at 15 thou and set timing at 12degrees BTDC
If your 1980 H D still has it's electronic ignition set the plug gap at .040 ... If some one has changed it to a point and condenser set up you need to set your plug gap at .028 and your points, if it has been converted , set at .018
Dist. Points gap is .016" (0.4mm)
Twins are .7-.8mm.
The Gap Band III was created in 1980.
To set the points gap on a 1977 KZ650, first, remove the left side cover to access the points. Use a feeler gauge to measure the gap while rotating the engine to align the points at their widest opening. The gap should be set to approximately 0.014 inches (0.35 mm). Once adjusted, tighten the points screws and recheck the gap to ensure it remains correct.
The dwell for the points should be 30 degrees. The spark plug gap should be .040".
0.35 gap
points gap on a 76 volkswagen beetle
That year engine does not have POINTS.