Hi again , more info gained from home grown mistakes that can help folk out hopefully.
I’ve recently removed the catalytic converter from my standard exhaust plus short cut the primary/secondary baffle chambers .
on swapping the exhausts I started the engine ,neglecting to connect the oxygen sensor .
This immediately triggered the engine management light and it remained on.
I ordered a Yamaha 4pin OBD connector but took a while to arrive , I continued to use my bike , up to 600 miles no problem with the management light on .
It arrived today , used a standard OBD2 reader and connected via my adapter cable , it flagged up my suspected oxygen sensor P0030 and I erased the the fault .
Note:
I caused this fault so was confident it was ok to run till I could clear it ..