engine problem and Fuel tank position
 

Hello,
I have a Avistar trainer with thunder tiger 42 engine with a 10/6 prob.
I'm facing a problem that my engine during flight( not on ground)
stack on a low rpm and doesn't respond to turtle changes.
what i did is:

1) checked the fuel tank for sealing and it OK
2) i install a new glow plug
3) i cleaned the fuel valve
4) i cleaned the head head of the engine
5) on the ground when i'm moving from idle to full theengine respond well

the problem is still there.
i have two more assumption , one is that the fuel tank is not located at the right position, the second is that the prob is to big.
i will be happy to hear more idea and details of the location of the fuel tank related to the engine.

RE: engine problem and Fuel tank position
 

How big is the tank, and how far away, and is the tank centre lined up with the throttle barrel?

RE: engine problem and Fuel tank position
 

What does this mean?

RE: engine problem and Fuel tank position
 

His engine is stuck on low throttle and won't respond to throttle input, unless I miss my guess.

RE: engine problem and Fuel tank position
 

So he is saying that the throttle works on the ground but not in the air. I would recommend that he adjust the idle. Maybe a little richer. I would bet the transistion from idle to WOT is a little rough on the ground as well.