Bought this last year at my local tractor dealer, not big box store, not that it matters I've been told, however, I have read the manual and it states the carb tune at the factory is set a little lean, or a little richer and after the first 8-10 tanks it should be set up and tuned by your pro technician. Now I'm not a real picky guy, but when it comes to something I should be able to use for 5-? Years hopefully, well I would hope the place who sales and services these trimmers would be smart enough to follow husqvarna guidelines and use a rev counter or tachometer to get the proper tune on the carburetor. Maybe I'm overreacting, but I carried it two months ago and put a tag on my machine, I even cleaned it up so they'd see I take good care of it. I bought 5 cans of $8 per can fuel mix to get the extra two year warranty on it but clearly this place could care less. I walked it in the shop and he said carry it out back and "bill" will get u set up. I seen the guy and said hi, I'm here for my 8-10 tank tune, I have my name and number on the machine just gimme a call wen you're finished, he said we can do it now, just hold it up for me. So he walks to his toolbox and I'm thinking cool, I get to see a rev counter or tachometer checker computer type thing and before my very eyes I'll see husqvarna service technician awesomeness before my very eyes.. well bill walks back with a small flathead screwdriver and said start it! One pull it cranked fine, wide open wasn't screaming like it did at first but still cut decent. , he turned h, l, then the carb idle, I said so wen do you hook up the rev counter or tachometer like I'm the manual? He chuckled and says I tune these by ear.. great, I'm dealing with the famous walbro whisperer, what an honor. A turn here, a turn there, a horrible smokers cough by my new friend bill and the luxury of hearing and seeing, and feeling like I almost tasted his 3/4 harked up oysters he so gracefully lobbed around our feet. Finished he said, simple as that, it'll run great now.. umm, thanks bill, and best of luck with that emphysema, I'll consider myself lucky to even have it crank later I'm thinking as I'm sadly and disgustingly stepping over his insides and trodding towards my truck.. well the wife had to go out for supper so I put off the trimming until the next morning, after 50-2,000 pulls and some newly invented curse words I'd invented, inspired by good ol bill himself, I take it upon myself to try to turn the screws to get it started and at least try to trim my yard and salvage some of what was left of this cool morning before it got up to 100% humidity and near 102 degrees. Needless to say, my husky isn't screaming like I'd hoped, I'm pretty sure a return trip to bill will only turn my stomach once again, so could someone please point me in the proper direction of the steps I should take to tune this carb so I won't end up too rich or too lean and make a nice orange piece of junk to use as art in my shop. I have read the "H" screw should be adjusted first while holding wot, then the "L" but what about the idle screw with spring? If these adjustments are designed to be extremely minute only for a technician to attempt, then I guess I'll have to find a new shop, but is husqvarna warranty centers like ford or chevy? Will any dealer service my trimmer or only where I bought it? If that's the case I guess they made profit on gas and trimmer. I really wish dealers and service centers was held responsible by husqvarna and had to adhere to the proper techniques of service, rather than just allowing bills ear to serve as a form of proper carb tuning. I'm native to the south but sometimes things are way too relaxed and overlooked here when it comes to this type of thing, husqvarna says use a receipt counter or tach and set it up per their specs, it seems like you tell that to the shops around here that's how you want it done and they make you feel like you're some kind of know it all fancy boy who probably has wifi and uses a cell phone to type messages to folks and actually put your credit card information out there for the world to see.. smh.. sadly I'm in the part of the old south where a flip phone is the norm, landlines are more trusted and tuning a carburetor by some old mans half deaf ears are about the best you're gonna get.. maybe I'm overreacting, but this trimmer is used by a lot of landscape businesses and is highly recommended for a everyday pro use, grass trimmer. It's not gonna cut underbrush with a blade or run through a knee high blackberry patch with the ease of its bigger brother, but when I first got it I was really happy with the performance and high, really fast acceleration, now I'm dealing with a dead spot at 1/4 throttle and a bog that doesn't seem to ever reach that scream that these things are known to have, I realize I've basically wrote a novel here on this post, but instead of trimming my 2.5 acres with my 1 year old and very light trimmer, I'm sitting beside it in the shop and wishing my mechanical skills were at the very least a couple notches above old bills, maybe I could be slinging grass right now.