Sorry, could not give you a number of turns, but what you'll see on your car is the HSN all the way screwed into the Needle holder (don't scare about it). All carb adjustment varies depending the fuel, nitro percentage and other parameters. If the main needle is factory set, your engine will be way too rich.

Tune it by hear and see it leaves a small trail of smoke and your engine will be happy. If you insist on tunning it by temp, your temp goal should be around 140 or 145ºC.

Do a quick look to the conrod for signs of wear (specially at TDC), probably is what you feel a worn conrod.