I am running a YS 91SR engine with an SB19 pipe installed in a T-Rex 700 heli. On first start, the engine turner over fine and I was only able to get it to idle. When the throttle was advance, no matter how slowly, the engine would die. There was plenty of smoke. I finally figured out that I had not installed the one way valve between the engine and the tank vent, so no pressure in the tank. I installed the filter but now the engine turns over too hard for the starter. I can turn it by hand. I have two batteries and charged both to make sure they were charged. I pull the glow plug and the engine turns over smoothly and fast with no strange noises. I also disconnected the fuel line from the tank vent and from the engine thinking too much pressure was causing a problem. No difference.

Any ideas?????[]

*** I have a T-Rex 450 and T-Rex 600, both electric. This is my first nitro, so I have no experience in this area.