To Jaguar

Once you take the plastic plate off of the injection assembly (on top of the right case) then you just look for the adjusting thingie (kind a like what adjusts the clutch cable tension) and screw it in (CW) a few turns. You might even try adjusting it with the motor running and stop screwing it in when you see that there is less smoke from the exhaust.

I don't think those cables stretch (they can only fray).
So if the adjuster is all the way in and you're still getting too much smoke then maybe there's something wrong with the oil pump.
I say to hell with it and just premix your gas. that's what I do and I ride my bike on the street every day and put gas in it 1-2 times daily. it's no bad deal.
I just carry engine oil in a plastic container with screw top. And the side of it is marked for every 100ml. So if I am running gas/oil at 40/1 then for every 100 ml, I put in 4 liters of gas. I let the gas man put in the gas first and then I slowly pour in the oil while nudging the bike with my hip to keep the gas agitating while the oil is mixing with it. Then I put the cap on and get on the bike and forcefully push up and down on the front end (holding onto the handgrips of course) to more violently mix the oil and gas.
After seizing my bike due to a malfunctioning oil injector I had no problem going back to the old method of oil/gas mixture.

Wumwmber
I just adjusted my oil cable.
Look under the carb from left side see plastic cover undo two screws.Under cover the cable runs in and you see two marks bottom mark is for idle and top is for flat out ,screw cable adjuster so these marks line up.

Harry
SR in Australia