So I bought a used engine and got it running, had it in my airplane for about 5 flights now.... the other day i started her up just like normal, let it idle for a minute, and then just as i was about to take off i noticed my transmitter was falling apart.... So i switched my info over to my friends trans... and after that it never started!! I went back to mine just to try to start it to see if i had the wrong settings.... it still didn't start. i changed the plugs, it didn't start, i went back to factory settings on the needles, it didn't start. I'm not sure what else to do!? I took out the plug and put on the cap, and turned the engine over, and i watched it spark so i know i've got the spark- I know the needles are set right.... i know its getting gas.... what can I do at this point?