RE: when you tune what you tune first? REPOST
This might be a little long winded but, when you tune a rc car engine you need a temp gun to get acurate readings from the head this is a start. Allways start with the top end needle. Get the car running and make some hot laps, about ten and check your temp on the head. Make sure you stay off to the side of the glow plug. For good engine life your shooting for a temp aof about 220 degrees. Now keep in mind that if you are running with the body off shoot for 190-200 degrees with it off as the body will add about 10 degrees to the head. If the head temp is lower then that turn the top needle in a little bit and repeat until you get a good head temp. Remember little adjustments about the width of a flat tip screew driver at a time. Usually this takes about one tank full to get right. Ocasionally check the head temp though out the day to keep the temp in check. Now for the low end, The low end is a little more trickey to do, start the car and let it sit on the bench at idle. If it loads up and dies within a few seconds you are to rich.turn the low end needle in a little and try again until you get a steedy idle. REMEMBER little adjustments at a time. If you need more help let me know. also this is for a 15 size engine for 1/10 cars. A little more history about the car/engine would help and what kind it is.