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Thats good to hear, I ran it all day today, and it had a stumble off idle, but no issues under full load. I found myself keeping it in the mid-range more often than I would have liked to have delimbing and walking along the trunk with a saw at 5k requires attention to detail. It was very noticable delimbing the trunks. I love the "No Loss" side cover nuts,and the side chain tension is quick and non cumbersom, it also runs cleaner than the 51, very little saw dust and debris around the sprocket and inside the cover compared to the 51.
I dunno if this applies to as sophisticated a saw as the 550 but every saw I ever had that stumbled off idle was do to a lean condition upon acceleration. With a traditional saw, this is abated temporarily by pulling out the choke a bit. Then you know you either need a screw adjustment or you have a carb orifice plugged up a little. With your saw Tolly, I'd be at a loss to figure that one out. May be the saw needs time to sort it out on its own but after a half dozen tankfuls or so and its still doing it, I'd want to inquire about it at your dealers. If you do have an L adjustment somewhere on your carb, turn it out a quarter turn and see if your problem goes away. If you do and it doesn't fix, i'd go straight back to the dealers as no properly tuned saw should be doing that. You may also want to check that you are indeed "flooring" the saw where you have no more take up on the trigger. Some times a thick or soft glove can prevent full acceleration depending on what part of the finger the operator uses on the trigger itself.
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