Beginner_1, T.T. Engines are economical in price, but they are good engines and do their job OK when setup properly. If the engine already started a couple of times, then something just went wrong now.* First, pull the glow plug from the engine and check if it glows RED-HOT when the Glow battery is connected to it. If when you pull the glow-plug from the engine it comes out full of gas, dry it up by blowing air into it, then put the battery to it and retry. Remember that the glow plug battery has to be around 1 and a half volts, a higher voltage ( over 2 volts ) will probably burn/ruin your plug. If the Glow plug does not get RED-HOT, you either have a bad plug or a bad Glowplug-battery. *If your plug comes out of the engine very wet, like filled with gas, you are probably flooding your engine, pull the engine`s instructions and set the needle to the recommended setting. You do that by closing the needle fully by screwing it clockwise until it stops and then rotating it counter-clockwise as many turns as the instructions tell you. *Remember that you must flip the prop counter-clockwise looking from the front, if you use an electric starter and it is connected backwards, it will rotate the engine in the wrong direction during starts, make sure the propeller turns counter-clockwise ( looking from the front ). * Make sure you got good, and the right fuel on the tank, and that it is making it`s way to the engine from the tank. If you set up the needle right, and the fuel tank is properly connected and has fuel on it, do this; with the glow battery NOT in the glow plug, remember; OFF the glow plug, open the carburator to its fully open ( max-power ) setting, put one finger on the carburator mouth to seal it, and rotate the prop by hand, slowly counter-clockwise a few turns, you should see the fuel coming fron the tank into the carb. through your fuel line, by suction of the engine piston. If that is not happening, you have a tank/fuel problem, or the fuel line or carburator is clogged. Once the fuel reaches the carb if it does, stop rotating the prop or you will flood the engine. REMEMBER to bring the carburator to idle position after this test, idle is when the carburetor air intake valve is just a little bit open. ( You can do the same by plugging the muffler exhaust hole if you have a air pressure line from the muffller to the tank, and this method is even faster in checking fuel supply to the carb ). This two methods are common ways to prime the engine, and you will get easier/quicker starts when you learn the trick. ALWAYS start your engine at idle or at 1/3 power setting at the most.**** If you either do not understand this stuff I mentioned, or can not get the engine to start anyways, you should get live help from an experienced person; Go to your local hobby shop and ask for help !!!! Remember that running props are dangerous and can harm you or somebody else.