Fuel tank issues...perhaps you have a foam clunk that needs some attension...I don't know...

What regulator check valve are you using. I have never owned a YS heli engine so I don't know what you are talking about. If its a regulator YS check valve part# YS0405 it will work fine. As I stated before you can also fly it without and it will work fine. The difference is very slight


As for fuel economy I can't really answer this question for you....If your pump is a little too rich and the HS is a on the lean side...this can be a way that lots of fuel will be sent through the engine when its at mid throttle and it will get poor economy.

Also I have no idea what size tank you are using.

I'm using a 20oz K+S tank...600cc I think and I usually get 13-15mins out of this tank flying a P-07 or F-07 maneuver set.

i can actually fly both P and F in the same flight.

Your throttle usage will also be a huge influence on fuel economy too.

Troy Newman
Team YS