Hey guys, im kind of a noob at this so bear with me. Last year my engine rod in my ATX funfactor snapped, so i got the upgrade for my NX-16 engine and upgraded it to a .18. Tried to start it, but couldn't. The pull start is really hard to pull and nothing happens when i do. I checked the glow plug, which works fine and saw that there was fuel inside the cylinder. I just dont get it, even w/ that i should get some sign of life out of my engine. I noticed that once i primed the engine, there was a puddle of fuel around my engine but i had trouble finding any fuel leaks because the engine is dry everywhere else. I was thinking of just buying the OS .18 engine and get rid of this problem, but i dont feel like spending more money after i had bought all the upgrades. Any advice would really help, thanks.