Well some engines are harder to tune that others, some are harder to keep tuned. There's pretty much 3 basic steps that apply to all nitros, and to retune always set needles to factory which is in your engines manual or can be found online. Be sure not to crank the needle hard, they are fragile. Once u feel resistance stop then count out the turns according to the manual and your at factory default.
1. Set the carbs idle screw gap to about 1mm, take off your air filter and eyeball it. Now this can vary slightly with some engines so look it up but 1mm is common and a good starting point. (Be sure you turn on Electrics and squeeze the throttle in you turn idle clockwise or u can damage it).
2. Make some wide open runs leaning out (clockwise) the HSN by 1/8 increments each pass and pay attention to acceleration and top speed. Every 1/8 turn with improve speed. Once you find the point where you turned it 1/ 8 and didn't see a difference, turn it back (counter clockwise) 1/8 and leave it. That's pretty much the sweet spot usually.
3. Your idle may be high at the point, do NOT use the idle screw to adjust your idle, you'll lose your tune. To idle down richen (counter clockwise) the LSN, or to idle up lean it (clockwise).
Pretty much the basics steps to tuning any nitro. Its a good starting point anyhow. I also suggest getting a hand held temp gauge and make several wide open runs then check temps, again read manual for optimum running temps cause leaning too much can overheat it. However try not to "tune to temperature" as its not a really good means but it helps to check and save u from frying it. If its too hot richen (counter clockwise) the HSN another 1/8 and check again.
this is pretty much standard stuff most of the people here probably do too.
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---------- Post added at 8:43 PM ---------- Previous post was at 8:36 PM ----------
Oh one more often overlooked thing. Outdoor temps and your elevation. A high elevation doesn't have as much O2 in the air and may need compensation, air temp same thing. Cold air contains more oxygen (O2) than hot air so figure, cold out, you may be able to lean it more... just watch temps!
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---------- Post added at 8:47 PM ---------- Previous post was at 8:43 PM ----------
Wait sorry...cold air means you'd richen a little since there's a higher concentration of o2 lol, sorry.
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