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1999 Sportsman 500 sputtering while accelerating

I purchased a 1999 sportsman a month ago knowing that it needed some TLC. Initial issue i was aware of was that it idled well but when accelerating it would sputter and then after it got through the sputter it would allow for a full rev. Then it would randomly make a big back fire after releasing the throttle and die. Then it would fire right back up and same issue. After a full rev it wouldn't go back to idle when you released the throttle without dying. It also just randomly dies running around 1500 rpms or so. Fires right back up and idles after dying. When I choke it seems to rev smoother however eventually it starts to flood out. it After reading many many forums on my issues I have done the following.

Pulled my fuel tank and emptied and cleaned it
Replaced all fuel lines and properly clamped them (new filter as well)
Replaced the fuel shutoff switch
Replaced the fuel pump
Replaced the camshaft and rockers which notoriously go bad for that model year
Existing exhaust rocker was worn but the camshaft looked good like it was replaced
Adjusted all valves at TDC to .006
Replaced the intake manifold
Replaced the stator assembly including the pickup coil
Tested and validated proper ohm readings on all electrical wires
Spark appears hot and consistent
Ensured that all wiring was well grounded and lubed the connections
Replaced the start/kill control cluster
Rebuilt the carb after cleaning it with an ultrasonic bath
Ended up buying a brand new Zoom carb from Amazon
Ensured that the pilot screw is 2 turns out
At this point i am feeling like it's a fuel/air mix issue perhaps?

Need some Help as I am about done tinkering with this thing!

Thank you in advance,
Dave
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Axle replacement

Less then 500 miles on my 16 renegade 1000 and axle is shot already!?

Last can am i always replaced with oem axles. Same now a days or is there a better axle? And im not talking Gorilla axles or anything like that because i havent seen them last any longer on my buddies quads.

Sent from my SM-N950U using Tapatalk
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2007 Sportsman 500 HO EFI HMF Titan QS slip on

Hello Gents,

Have a 07 Sportsman 500 HO EFI, want to add a HMF Titan QS slip on, I have researched and get conflicting reports on this, Do I need to get a EFI tuner or something like a Dobeck EJK for it if I add the Titan QS slip on?

If anyone has done this I would appreciate the feedback

Thanks!!
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2001 Sportsman 500 starting problem

I just purchased this 2001 Sportsman 500. It seemed to run fine. But after about a week, it suddenly would not start. I had power to the head and lights, but when I hit the starter, nothing happened. I took the battery into a local battery shop to be tested. They confirmed that the batttery was bad. I purchased and installed a new batttery, and still nothing. Again, I have power to the head, the lights and to the kill switch. But the engine does not turn over and there is no clicking. I would appreciate any suggestions as to where to look next? Thanks!
Posted on

2001 Sportsman 500 starting problem

I just purchased this 2001 Sportsman 500. It seemed to run fine. But after about a week, it suddenly would not start. I had power to the head and lights, but when I hit the starter, nothing happened. I took the battery into a local battery shop to be tested. They confirmed that the batttery was bad. I purchased and installed a new batttery, and still nothing. Again, I have power to the head, the lights and to the kill switch. But the engine does not turn over and there is no clicking. I would appreciate any suggestions as to where to look next? Thanks!
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Power Vision

So I just received my Looney Tuned Exhaust for my HL 850 and I'm not a fan of "piggyback" fuel controllers so I am considering the Power Vision ECU flash. My buddy has the power vision already but I only see maps for stock intake and exhaust on their website. Is there an auto tune option or if anyone has experience with custom maps can please help. Don't have access to a Dyno if not I would tune it that way. Thanks.