how did you determine that it wasn't firing on number 1 ?
here is a video that might help, although it is a different engine then yours adjusting the points are done the same way, just a different gap..
the adjustment is at the end of the video
click here or read these instructions.
Loosen the screw that holds the stationary point bracket to the base plate. Not completely, just enough so that you can move the bracket by inserting a screwdriver tip and twisting it Adjustment is a matter of trial and error. Move the stationary point out a bit if it was too close, tighten the holding screw (not too tight), and measure the gap. If it still isn't right, try again. The feeler gauge should have a light drag when the points are properly adjusted. This is where practice and patience comes in handy.
good luck
