Blumby, there is a specific air gap but i dont recall it off the top of my head. The gap has a fair tolerance to deviation from the specified norm but i found an everyday ordinary business card to be the perfect size for the job. and you can do both sides at the same time, otherwise you need one of those long, flexible feeler guages. The card has never let me down in the past.
Also some obvious questions for you and i apologise in advance if they seem trivial. 1) have you got spark? 2) Is the keyway/flywheel in place and in good order? 3) have you tried some starter fluid in the plughole to see if that gets it going?
It can't be anything too drastic as you haven't done anything major in the repair.
Good Luck!!
