sputtering

My sportsman started sputtering and engine light comes on and off when throttling. Drove around block and startled sputtering and the orange engine light will come on and off . Sporadic sputter and light. Oil was a little foamy about 1800 miles on machine. Any ideas or what to check?

I have a 2005 Sportsman 500 HO that has begun sputtering at around 3500 rpm only. It sputters like a rev limiter at 3500 Accelerating or decellerating. I have a spare parts bike and have swapped both modules rebuilt the carb, changed the plug and run 10 gallons of fresh gas through it. Any ideas...

my 08 outlaw 525 s is sputtering or breaking up at top end of each gear. is it the fuel flow? I ran some sea foam through it. I have a Yoshi exhaust RS5. maybe the jets weren't changed for the exhaust im thinking. appreciate any opinions or guidance on this issues before I send it to the shop...

Well, as a noob with my first Polaris I just wanted to give a shout out. First props to Darren who hooked me up with pdf manuals. I got my big boss used about 4 months ago and didn't run it much before I bought it. I get to use it every month or two. As with my motorcycle forums, when I think I...

This machine runs great going forward. But when I put it in reverse, it starts sputtering and coughing so bad that it won't even move! Any ideas why it would do that? I recently replaced the intake valve and might have gotten the timing chain off by a tooth, but it runs great except in reverse.

I recently bought a used 2008 sportsman 800 from a dealer. They offered me a warranty but I denied it. On my first ride I noticed it was sputtering at start up. It was cold and after a few minutes of riding power would kick in. I just thought it was warming up. Then on my third day it started...

Last weekend i got a chance to take my new scrambler mudding with some friends. But every so often i would go through some water (water was a little over the clutch cover) and the atv started to sputter, and i would barely make it out of the mudhole. Then once i was out of the water it would...