When I took off my glow plug to look if it was still good, there was a layer of some orange looking liquid at the plug's bottom. I can also see it on top of the piston head by looking down the hole,and that is all i looked at. Can someone explain if this is good or bad. I'm running team losi nitrotane. The enigne is from the carsonmodelsport go kart.

It's just the oil that's left over in the engine from running it.
If you don't run it for long periods of time after each run, I suggest buying after run oil to make sure nothings rusts etc

the anti rust inhibitors and the dye used can stain the motor, but nitrotane is good fuel.