[dbow32]

Ok, I went hunting last weekend. My RZR 4 ran great until one day I started it and the exhaust was so rich the guy riding behind me got sick. i was coming down the mountain in low and it seemed really lumpy. When I got to the bottom and put it in high i tried to floor it and it would kill at full throttle.
as soon as I let up on the throttle it would come back on. I did this several times with the same result.
when we made it back to camp i turned it off and let it rest for a few minutes.
I started it up again and again the exhaust was really rich. It also seemed to make a ticking sound that i have never heard before. I turned it off and let it set for about an hour. Then I tried again. This time everything seemed to be normal.
and it hasn't done it since. I will add that it was really muddy up there and every nook and cranny was coated in mud. What do you guys think? I'm baffled.

 

[cowkicker84]

Fouled spark plug

 

[dbow32]

if it was fouled wouldn't it stay like that? it's now running fine.

 

[cowkicker84]

Not alll the time,it might have had a piece of carbon stuck to it and finally blew off allowing full spark again, just saying- that is the first place i would look and go from there, coil wires loose, bad battery connections, just for starters