Adjust the valves while your in there.It only takes about 30 minutes to check and then you can rule it out. I can't tell you how many cams I've replaced over the years on the 425s and 500s. Pop the valve cap off,remove the rockers and verify the cam lobes and followers are in good shape. When i get an older Sportsman 500 in the shop with what appears to be carburetor problems,believe it or not,first thing i check is the camshaft. Wish you the best in getting your ride back together! If it actually takes 1/4+ throttle to move and it is not because of the engine performance itself, Like those before, it could be the belt and or clutch have an issue. It would start in any weather almost faster than I could get my thumb of the switch. I always put one ounce of seafoam in every tank after that and never had another problem. I then put one more ounce of seafoam in the tank and filled it. I would readjust the idle speed and let it keep running. I could hear the engine "clean up" every so often and the engine speed would raise. I put in 1 gallon of fresh fuel with 6 ounces (rich) of seafoam and let it run at a high idle for almost an hour. I had it act similar one time when I forgot to empty the carb. If you are going to let it sit, turn off the fuel and run the carb out before storing. The corrosion will partially plug up the circuits, especially the low speed one. Old fuel with alcohol is hard on these carbs. I help a lot of older farmers and work on their old tractors and things that sit a lot. If so, Part A is what has worked for me on many vehicles and tractors. Reading your description, I believe you are talking a fuel problem. Any thoughts or ideas would be greatly appreciated. I tried adjusting the idle but every time i do it'll get to a sweet spot but after driving it down the driveway and back the idle will go up and down to the point where i can't put it in gear because the gears will grind. It takes more effort to get started and bogs out idling after about 30 seconds. It's safe to say it now runs worse than when i started working on it 2 days ago. I also messed with the idle and the throttle cable adjuster up on the handlebars. I cleaned the carb and adjusted the air/fuel screw to 1 3/4 turns out. it also would bog out randomly after you came to a stop and sounded like it was getting too much fuel. Before it sat i replaced the gas cap, fuel filter, fuel pump, petcock, battery, starter relay, oil and oil filter. I recently went to start it and it started so quickly and without choke or throttle but the ATV wouldn't move till about 1/4 throttle and it wasn't really a smooth ride until 1/2 throttle.
It ran great but after some use for a couple months it got a flat tire and for some reason we just forgot about it and it sat for some time. A year or so ago we got it running after replacing the kill switch.
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