Polaris Sportsman Magnum ATV tuning & solving bogging down carburetor issues

[@AlexSmith-f2r]

Hey brother, where’d you get your O-rings for your gate valve?

[@allwegottadois]

My local Polaris dealer, but you can order the parts online, use the Polaris parts browser to look up part #s

[@robertholsopple9451]

Would a worn cam cause a dead spot at lower throttle. I have a 97 Scrambler 500 and ive replaced everything but the engine internals and i still have this issue. I tried 2 brand new carbs and the boot isnt cracked. Air box is good. Everything else is brand new. I dont know the symptoms of a worn cam.

[@allwegottadois]

@@robertholsopple9451 no typically a worn out cam will idle and have fairly good throttle response at low RPM. It just won’t rev up it just because of valves aren’t opening to give it enough airflow but typically no , a flat cam or a compromised cam will function pretty good up till about three or 4000 RPM and will backfire a lot too but , won’t have a dead spot off idle. What kind of carburetors are you putting on there OEM because the original OEM carb usually never needs replacing just change out the wearable parts and then you tune it for your elevation

[@allwegottadois]

@@robertholsopple9451 well, the engines running do you have black smoke that comes out the tailpipe when you punched the throttle or is it clean or does it backfire there’s more to just a dead spot usually you have too much fuel or not enough fuel, just have to determine which it is and adjust accordingly

[@kyler6989]

got polaris magnum 425 to seems very slow now wont even go over 30mph and ideas on what might be wrong?

[@kyler6989]

any*

[@allwegottadois]

Remove the carburetor, & go through it . Especially the diaphragm that lifts the needle valve

[@kyler6989]

@@allwegottadois see thing is iv done cleaned the carb 2 times thinkin that was the issue before this happened bc it was bogging terrible but it wasnt.

[@allwegottadois]

Have you checked your cam , it could be flat. Take the valve, cover off and check your valve clearance & cam.