sputtering

I’ve been using my atv for the first few times this season and has been running great after changing all the fluids and spark plug. While riding I noticed an extreme lost of power and it stayed that way. The atv starts up fine and idles fine, I keep it around 1200- 1500 rpm during idle. Now...

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...

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...