Morini suzuki katona works mk1..70cc bogging

Just brought a suzuki katona works mk1 w reg..
Its got a 70cc cast sports kit fitted..
And a 17.5 mm carb with auto choke..

Starts fine revs on stand but on wot.. it boggs..

Jet size was 86 on standard exhaust..

Ive since brought a Giannelli racing exhaust..
Loads of jets ect..

Still boggs on wot.. idles fine blip throttle perfect..
I've adjusted float height..
Fitted several jets.. still the same ...

Ive noticed when I turn the key off.. bike stalls a little but still runs.. dosnt turn off..
When key is turned off.. ive tried to ride it but still boggs..

Its got a yellow cdi.. coil thing fitted....
Any advise would be helpful please