With my C6BB and 8mm stock venturi (I usually use a 7mm or 6.5mm) I got anywhere between 9min to 9min 30 seconds using the timer in my 3pks. The longer 9min 30sec was when I had to turn-marshal myself during practice. I love the clunk in the Losi tank!! Of course, run time varies very much so with throttle control, tune and track design and length. We have quite a few slower speed jumps with significant air time.
My old WS7II would get closer to 7 minutes. Im hoping the Ninja lives up to its hype on run time, but that will be awhile till I run it since I have a spare piston, sleeve and conrod for my C6BB. The Ninja will mainly be a backup when the C6BB is being maintained.
I will be using an 053 pipe with the Ninja, but the Nova pipes are not very durable. Has anyone tried the Dynamite, Ofna or Werks based 053's? Price is not a concern as I usually buy based on performance.