Tony,

Do you have any tips on how to get to the 11 minute runtime mark? I have the ninja 21 and 28 both with the 2053 pipe and long header and both with the stock carb restrictors. At my first race last, I estimated that I could get about 7 minutes out of both engines based on how much gas I had left after the 5 minute qualifiers.

In the main, the 28 ran out of gas twice at the 6 minute mark. I didn't have time to check the temperature that closely, so I may have been a little rich, but the engine had more than enough power at the settings I had and I could easily make the triples without even getting to full throttle.

I haven't tried smaller carb restrictors, but can you use a smaller one without sacrificing too much power? Did you figure out how much you can extend runtime with a smaller one? What temperature was your engine at when you ran 11 or 12 minutes?

Thanks.