Dragged the iBoy Katana from the back of the garage where it has lurked since July 2019, sulking.
Issues from 2019 look like it was carbs, so carbs off and 3 of 4 pilot jets blocked so all jets ultrasonically cleaned and passageways cleared. All compressions were good. Carbs back on and all good, runs like a good 'un. Put original exhaust back on, NOS anti-dive on right as that was leaking, oil and filter change and straight through the MOT today.
As I have the Swiss Katana, 400 and 250 then I'll be selling this one as need some space in garage.
UB