Originally posted by Goinstraightup
Sounds like your engine leaned out. I think you have to richen your high speed needle valve. Turn it counter clockwise. Let us know which engine and fuel you are using. Other things to consider is to make sure there is no dirt in your needle valve assembly and also make sure your clunk in your fuel tank didn't get stuck fore ward. This may well be the problem as you had a bit of a crash. Hope this helps.
I have a .40FX and I am using fuel made by the club. It contains 20 % synthetic oil and 5% nitro. The needle is already turned open for 1.5 turns. The clunk cannot bend forward because there is a metal tube in it
Thanks