Vertical crankshaft - remove flywheel nut or recoil start boss which does the same thing, gently lever the flywheel upwards with 2 screwdrivers, put the nut a little way back on and give it a sharp tap with a hammer. There is a proper extractor but my method does work. Horizontal crank - usually there's a small plate on the front side which when removed allows you again to rap the flywheel to jerk it free. When flywheel off, 2 screws covering the aluminium points cover gives you the points and condenser. Clean both point surfaces with an oilstone or file, set gap to 15 thou by sliding condenser down its clamp.
John
March 2008