You don't give much information on how the bike is running. But most times when there is a performance decease it is best to clean the fuel system. Spray some Gum Out or similar product( I prefer Deep Creep and Sea Foam) in the carb. then follow up with some in the tank. Also change the fuel filter.
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2 stroke oil feels alot different than brake fluid and is usually blue or green ,where brake fluid is supposed to be clear but might be root beer brown in a 1991 bike. Stick your finger in and you'll find the one for oil....Good luck to you friend....Tim
You have two (2) concerns and are interrelated to each other:
lean right, oil light comes on - the 2T oil reservoir on most NSR designs would be attached to the right side, relatively high on the frame;
on leaning towards the right, the contents of this reservoir would be displaced because of the angle. The 2T oil level sensor/switch would erroneously sense low or no 2T oil condition while thus leaned;
this sensor/switch marked "Oil Level Switch" is connected to two (2) wires Green/Red and Green (ground);
the false "low or no 2T oil" would trigger the "Low Oil/Ignition Warning" light to glow red; simultaneously
the other Green/Red wire would go and trigger the PGM-III to switch OFF, hence the engine cutout.
Solution would be to fill the reservoir with appropriate 2T oil.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.