I was thinking it would be nice to have the reserve. Gonna try a couple 1 hour ice races this winter with the Zilla. Kinda like a signal to pit for gas. But a better flow is better fot the beast.  Gonna pull the petcock and take a looksee.

NEVER RUN A HIGH PERFORMANCE TWO STROKE ON ANYTHING BUT THE RESERVE POSITION ON THE PETCOCK unless you have done the petcock mod where it is always drawing fuel from the on and reserve ports in the petcock.

When the fuel level gets low enough to "give you a signal that the fuel is low"  it may be one that you were not expecting.  A seized piston or blowing a hole in the piston crown or caving in the top of the piston is the signal that is often sent to the rider

A two stroke that is slightly rich runs well.  A two stroke that has the air/fuel ratio perfect runs well.  A two stroke that has the A/F ratio a little lean runs well.  A two stroke that that has the A/F ratio real lean also runs well.  Most racers cannot tell the difference in the way the engine is running if it is real lean or running the perfect A/F ratio.

The fuel level in the tank while riding is constantly moving up and down around the petcock's on position stand pipe.  When the fuel level is still a inch or so above the stand pipe that feeds the on position of the petcock, you may be constantly flirting with small periods of leanness due to fuel slosh.  As the fuel level gets lower and lower the periods of leanness can get longer and longer. 

An engine that is tuned well and running hard like on oval track racing, cannot be teased with brief periods of leanness because the fuel slosh is not feeding the petcock that is positioned to the on position.  The reserve fuel port of the petcock feeds off of the very bottom of the tank while the stand pipe that feeds the on position of the petcock is up off of the bottom of the tank 2 to 3 inches.

You can constantly monitor your fuel level by placing a "T" in the fuel line feeding the carb and hooking the other barb of the "T" to a piece of clear fuel line.  This clear line will become a sight gauge. Take a felt marker and place a line on the clear tube where you think you should refuel.   Run the clear line in a place that is easy to glance at at while racing.  The fuel level in the clear line will be the same as the fuel level in the tank in the area of the petcock.  One end of the clear line has to be open to the atmosphere.  The open end must go high enough to prevent fuel from sloshing out of it.  The opening in the open end of the clear line (sight gauge) only needs to be as large as a pin hole.