I've only recently entered into the UC/CL hobby but have been flying RC for a few years and know a little about RC Nitro engines.  I'm building my first UC plane (Brodak Buster) and have 'picked up' an Enya 29 5224 (no other markings) UC engine from an online Classified add from a fellow flyer.  The plane is nearly ready for the engine to be mounted so I put it on the stand for a test run before hand.  I put a piece of fuel tubing on the inlet to blow on while getting the needle setting about where I thought it would start and discovered the fully closed position still permitted more 'flow' of air than I thought should be necessary to run.  I know these engines run full open so I wasn't sure if this was "normal" (but I assumed I could cut the flow down to nearly nothing).  I opened the needle 1-1/2 turns and started the engine.  It did nothing but four stroke even with the needle clear closed?  If I pinched the supply line she would open up to a healthy sounding run but would immediately go back to a labored run spewing excessive amounts of fuel when the line was opened up.  Could this be the wrong needle for the engine?  Needle appears to be in good shape.  What am I missing here?  Any help would be appreciated.

GT-1 Chappy

    Yeah, like Dave said the wrong needle, or the needle has slipped on the assembly. In the instructions they tell you not to over tighten the needle when closing it, and this is one reason why! It can also be a source of an air leak, and might not have been assemble correctly at the factory. Take the spring off and examine the hub and see what it looks like. If there is a stub sticking out on the spring side, see if you can lightly tap on it to push it through the hub. If so, re-test it like you did. If no soap, a new one is in order.
   Type at you later,
    Dan McEntee