I have the top handle 536 and this clogging of the sprocket cover (no clutch) is a problem for most anything but a cross cut in sizeable stuff. I think they did improve on some of my other complaints, but the price is higher.Another issue is with how the clutch cover pulls material into it and then jams or clogs.
What do you mean by sprocket bolt? Mine has a snap ring to hold the sprocket and a washer like things on. The Makita sprockets have the same inner bore dimensions and are wider than the Husky sprocket even replacing both washer thing and the sprocket. A little work with a curt off wheel on a dremel can thin that sprocket at the snap ring. I am not sure those flats that power the sprocket are really sizeable enough. Look at what a splined rim uses.My unit also had the sprocket bolt come loose/out several times.
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