[wilkin250r]

Define "momentary boost".

Nitrous doesn't do well for sustained boost. As the nitrous depletes from the bottle, the bottle temperature drops, which means nitrous pressure drops, which means nitrous AMOUNT decreases over time. However, because fuel is fed from a fuel pump, the amount of fuel being fed into the engine remains constant.

Since nitrous is the oxygen source, and you have a rapidly decreasing oxygen supply, you are rapidly getting a richer and richer mixture.

Larger bottles can supply longer periods of time, and I've never TESTED this theory, but I have run nitrous before. I would be surprised if you could hold the button for a full minute before you start actually loosing power due to your fuel/air mixture being overly rich, possibly fouling your plugs.