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Definately looks lean. Don`t forget your A/F screw only controls mixture from idle to 1/4 throttle, primary jet from 1/4 to 1/2, main jet 1/2 to full throttle, all overlapping to a certain extent.
Ideally you need a longish stretch of road with a pull off at the end, go full throttle for a couple of hundred metres and then cut the engine whilst going full pelt, coast to the side of the road and then check the plug.
Just to double check, you have the clip in the slot nearest the needle end ?

Got it to the rolling chassis stage

Bit of paint applied

On the floor where you put your feet should be a plastic flap held in by, I think, four screws. The battery is under that flap.

There are quite a few cdi`s which have a limiter on, besides the Adly, although the wire that needs snipping varies in colour between models. Some have the loop, others have the wire disappearing off into the loom. Unfortunately there isn`t any hard and fast information except searching for a particular model on the net under 'derestriction'.

I doubt it`s your starter motor, it`s more likely to be the connections on the cable as I stated above.

Before replacing parts you`re going to have to narrow down the problem. It could be spark related or fuel. I take it there was no unusual mechanical noise when the engine cut out ?
Pop the spark plug out and place it in the cap then hold it against something metal on the engine, crank the starter and see if you`re getting a decent spark. If no spark then work you`re way back through the system to ignition lead/coil and so on. If you are getting a spark then take out the air filter and try a short squirt of something like 'easy start' down the intake, then crank the starter. The easy start should make it fire up for a short moment which would suggest fuel starvation to the carb.
One other thing, I think the Jonway 250 is liquid cooled, did the temp gauge go up at all before it stopped ?