Yeah, thought Id give some info this time instead of you TRD. lol

Anywho, had to run near the end of typing that, so heres a bit more:

Like TRD says, Read and read some more.

I highly suggest that you take out the exploded view diagram that came with your truck and go trhough the truck systematically so that you can recognize the parts. Also, check that all of the screws are tight! Sometimes they are not from factory. And before you try starting it, I suggest double checking your gear mesh. 2 out of my 5 CEN RCs came with the gears improperly meshed.

by gear mesh, I mean how tightly the gears fit together. http://www.epi-eng.com/images/GBX-GearGeoTx.jpg
To check the mesh, take either a strip of the thick printer paper, or fold a piece of thin looseleaf paper in half. Then try to run the paper through the gears by spinning the gears. The paper should come out wrinkled, but not ripped. After a while you will be able to do it by eye, but this is the safest way.
If it needs adjusted, loosed the 4 bolts below the engine, and lside the engine so the gears are meshed properly and perfectly parallel. Make sure to use some medium or at least low strength locktite on the motor bolts.

After you've gone through all of this, FOLLOW THE PROPER BREAK IN PROCEDURE! Break in is very important on these engines. The procedure is in you nitro handbook, and online.

After break in, you may need to change the glowplug from running the engine rich, so change it if you need to.

THEN you can start tuning it. I suggest, as TRD said, READING a lot about tuning, and watch these youtube videos. (note: they are made by HPI and traxxas, so the procedure is slightly different than CENs, but its the same idea)

http://www.youtube.com/watch?v=pEGjE...elated&search=

http://www.youtube.com/watch?v=oSmMz...elated&search=

http://www.youtube.com/watch?v=BJFsJAxNoRg