I have just bought myself a CEN Gen. LE. I ran 1 tank of 20% with no batteries installed and of course no electrics on. Engine idled perfectly, just as described in the operation manual (step 13) found on CEN website.

Step 13. Proper engine break-in is very important to achieve the highest possible performance and reliability
Allow yourself some time to properly break-in the engine. This is one of the most important steps to follow so take your time. Do not run the engine at high RPMs until it is completely broken in. It is usual for the engine to stall, run inconsistently, and even foul glow plugs during the first couple of tanks. If this is happening to yours, don’t worry about it too much. It is a normal step in running any nitro powered R/C car. All of this will go-away when your engine is broken in well.

However when I came to run the 2nd tank through, with new fuel 25% and batteries install and electric on, the truck decided it didn't want to sit and idle like before it just tried to take off down the street at pretty much full throttle.

I don't know much about the Airtronics MX-3 Radio System, therefore don't know the correct setting nor what I am doing when trying to set it. The current setting of the transmitter is 88/75.95 MHz.

I have not played with the carb. settings bar the idle. I don't understand why the 1st tank ran through perfectly with no radio system, then the 2nd played up with radio system on unless the settings are incorrect on the radio??

Please help anyone, don't know anything about what I doing with this truck. My last truck (Smartech Magic Wheel/T-Maxx) is a toy compared to this one. Any helpful hints would be great.