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Just use the settings from whatever OS engine it comes off of and start there. I think the OS 11K carb has HSN flush with the top of the brass collar, LSN flush with the throttle arm and the mid-speed (low speed needle seat) is .5 turns from flush, then left alone. Then adjust the HSN/LSN in 1/4...

Both. Tall grass, a bit rich on both. Lots of WOT running, rich on both, but more so the HSN. Mostly short runs with typical max of 1/2-3/4 throttle, rich on LSN. Usually, adjustments made to the HSN affect the LSN anyway in the same direction. Adjusting the HSN changes the overall fuel flow...

Here are a few tuning things you can go over that may help: https://www.rcnitrotalk.com/forum/showthread.php?t=60832 http://home.comcast.net/~98gmarquee/pics/misc/ParisRacingEngineTuningTechTips.pdf http://www.rchobbies.org/cars_eng-tuning.htm

It takes very little ambient weather change to throw off tune. You may just want to work on adjusting the tune yourself. Regardless of engine or vehicle, I've always had to tweak the tune a bit each day I run and occasionally throughout the day as weather changes or places I bash change. LIke...