Engine modifiers are quite out there, basically almost all makes the same, add timing to the crank, port the sleeve and modify the carb.
Others can do many other things: Polish the conrod (Mspeed), add some epoxy ramp to the crank (JP, Mspeed and others) and the least change the steel balls for ceramic on the main bearing.
Here have one engine modifier that makes quite good, he does little details that makes the difference from the rest (Ecaz)... For example: it grounds the part of the head who touches the plug button for a better contact.
Each engine who modifies gets an unique name with all the info and timing information and it can duplicate exactly if anyone requests one. And the best of all, he tunes only one type of engine and hears what is requesting the guy and acts on the engine depending what's asked.
[quote=MugenDrew;2684554]BATTERIES are for FLASH LIGHTS, gasoline is for cleanin parts, alcohol is for me to drink and well NITRO...everybody know thats for racing.[/quote] :D:D:D