I always adjust idle screws with the slides up to prevent this. I checked the slides and there is damage from someone at one time turning the idle screws in without pulling the slides up first. I don't remember exact specs for that sled but I believe 2.5 is roughly the starting point so it's not like my slides are sitting massively high at idle. I removed the carbs and measured my slide height on engine side and at 1600 rpm I am sitting at about 2.7 mm height on the slides. Well today I decided to go through the carbs again. Think I'm onto something or just overthinking the whole thing ? I know most do as you are leaning out the carbs as the fuel level in the bowls drop but I did check them during cleaning and they were in spec. I was thinking maybe my floats are too high as if I turn off the fuel valve while it's running and the bowls start to empty the revs come up to 3000. No snow to take on a test run so may have to wait till next winter. I know I must be missing something as it just doesn't look right but the thing idles and revs up good as is. Even if I could turn them more they look like they would slip off the slides and end up with the slides sitting on top of them instead of on the taper. At 1600 rpm my slides are open enough that a 3/8 bit will fit through no problem and the screws are sitting pretty well at the end of the taper on the slides. I usually use a 1/4 drill bit then mark the idle screws and when I start it I turn them equal amounts then when the idle is set I recheck to make sure they are equal again. When I set the slides for idle I start with a drill bit to get them even. When I synced the carbs I start by getting both slides even on the idle screws then adjust cables to pull even. I was thinking that they may be the wrong ones.
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