not when i build it .with them new lipo batterys yes it fires most of the time[X(] fireing up a electric motor is not a good thing but it dos it very easy

Guess your stuck with slime. Just kiddin! I fly both and love it all.

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.

hahahahhahhhaahahahahahhaahhaah i dont think so no prime no choke 4 flips hahahaahahahaahahahaahah

i think i found the problem it is around 0 fahrenheit. could that be a problem?

I bought one of those Bobcats from Cermark,and it came with a inverted TT 42--Only way I could get it started was to turn the plane up-side down --thereby putting the engine right side up.I bought one of those foam cradle thingys.I hand primed it ,and then it started with the use of a elect. starter,but it was still a hard motor to start.Think I wound up using a #A-3 plug..Never did get it broke in--IMHO --piece of junk.. Think the motor should be put on a motor stand ,and broke in properly..All the new Bobcats have the motor mounted right side up -----

If you have the engine upside down that makes it hard to start, as amelia-air says, the cold will not help either, but if you can rotate the engine freely and the gas is not frozen, it should start, just don`t make adjustments until the engine has warmed up.

Outside temperature is a BIG factor in starting glow engines. Especially using low nitro fuels. Low meaning below 20% in cold temperatures.

You may want to warm you engine by placing the aircraft indoors for a while. Also, like everyone else has stated, check the condition of your glow plug. As soon as you can, pick up an OS #8 plug. It's hotter than the one you are using and will assist in keeping your plane running. You should also warm up your fuel by placing it indoors and letting it come up to room temperature. At zero degrees, the oil or nitro could have gelled, making it unusable until thawed.

After you get the engine started, leave the glow driver on for a little bit as the engine warms up. Also check the condition of your glow battery. Extremely cold temps, will drag them down quite quickly. You may want to check into purchasing a glow driver that accepts a 1.5 volt dry cell battery for more voltage to your glow plug.

Best of luck.

I agree about using OS # 8, in Norway in autumn and winter time we had to change from OS #3 to #8 to get the engine works (engines in size .40 - .46). We have the same discussion in the Norwegian forum about these problems and the conclusion was that changing plug will solve the problem in most cases.