You are not overwhelmed with views on poor starting. I have been eagerly been awaiting expert pronouncements on this matter.
I have two 2speed Scotts about the same age as yours. One starts easily, whatever the circumstances. The other doesn’t. Like you, I’ve been struggling for years with it. In desperation, I’ve even fitted a Mikuni carb. To my embarrassment, it features on the Club calendar, September 2005, complete with bath plug and chain !
I am not an expert, this is a completely uninformed theory.
Do you think that a lack of primary compression might be our problem ? It would fit in with the poor starting, but good running scenario….once it’s going, it’s OK. When mine will not start, I take the plugs out, splash a drop of petrol down the plug holes, kick it over a few times, plugs back, it goes first kick. It works every time. It makes me wonder if the correct charge is getting into the combustion chamber.
How you quantify or measure crankcase compression is beyond me. There seem to be plenty of places a leak could occur. How do you fix it ? Roger Moss has kindly offered to look at my engine when he gets time. I’ll let you know how we get on.