No idea what MAS is, the only thing that is wired thru the coils is

Fuel pump relay
The ignition kill switch
Cdi unit

Im 95% sure its the coils/leads wired wrong : -

Wrong lead to wrong spark plug x2.

See what happens tommorow when you fire it up.

Just dont dive in and rip it all out, see what cylinders are firing and see what leads are connected to what coils and go from there.

The left coil ( as you sit on the bike ) fires cylinders 1 ( on the left as you sit on the bike ) and 4 - the right coil fires 2 and 3 .

If you can get it running you can connect a DVM to one of the live terminals from the CDI ( yellow/blue wire and Blue/yellow wire, there are 2 as there are 2 coils ) side of the coil and see it pulsing 12v ( other DVM lead to the chasis ) your DVM may not be able to lock on as it happens very quick but if you get a jump in the volts its receiving a pulse from the CDI unit.

When I took mine apart I used nail varnish to mark them all up, X, O , -- , + ,1 ,2 , 3, 4 etc so at least I wouldnt have to refer to the manual.

It was the coils wired wrong

feel like a right nob haha thanks for explaining that the left coil does 1+4 and right 2+3 otherwise we'd have never fixed it... today was the last night i was gonna spend on it... i was genuinely just about to take it down the road and have it "SPONTANIOUSLY COMBUST " lol

just about to re put my new spark plugs in (again) and take my baby for a spin!

you're a lifesaver!

No probs.