I set it all up with a degree disc and depth gauge as a double check, but I'm having a problem and so firstly I want to check whether something has slipped, and secondly I may need to take the mag off so I'll loose all my careful work.
Its proving impossible to start after its rebuild. It did start on the kick starter a few times and ran for around 5 mins several times before I shut it down to do some adjustments. Now it won't restart so I will be checking the carb fully, resetting the float level, checking the timing and cleaning the points.
The spark is OK ish but not really strong, the plugs are a bit wet but not really as wet as they should be. Its not running cleanly on both cylinders. Compression check is good.
So its back to first principles and go over it all again, but since I have the plug gauge I'll use that to avoid taking the chaincase cover off.
When I did the timing with the head off I compared the piston height to the degree disc expecting the degree disc to be easier, but it made no difference so I'm happy to work off piston height.