the engine in my nitro rs4 rtr3 is tuned relatively well, (bluish smoke, good rpm's, etc) but the pull start taked forever to start it cold. after i run it, even if only for a minute, it starts right up, but after sitting for even a little while, it needs 30+ pulls to start. i try priming it with the thing on the fuel tank 15-20 times, but it's still hell to start. i know my glow plug and ignitor work... any ideas? thanx.