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217 Posts
2005 Polaris Sportsman 500 HO Carb
So yesterday I had a problem with my 500 that is starting to baffle me a bit. I do have some ideas but I want to see what you guys think. Here's it go!
I was out on my bike screwing around and it runs great. Lots of power, idles fine and runs the same as it always has. The only thing I noticed was after a short wot run and as soon as I let go the throttle it backfires. I didn't think to muck of it at the time.
Now I decide to make a run down the ice when all the problems start.
I hold the bike at wot for about 30 seconds and all is fine then all of a sudden it starts backfiring and dies. It starts back up with no problems. I take the bike home and change all the fuel over to fresh premium gas and it did make a difference. I then cleaned the Uni filter with no difference still backfiring and dieing at WOT. I changed the sparkplug and fuel filter with no change. I then pull off the fuel pump and cleaned it. It was full of mud on the vented side.
Cleaning the fuel pump did make a slight difference. The bike now does NOT backfire at WOT but it now sputters and dies at WOT after about 30 seconds.
So yesterday I had a problem with my 500 that is starting to baffle me a bit. I do have some ideas but I want to see what you guys think. Here's it go!
I was out on my bike screwing around and it runs great. Lots of power, idles fine and runs the same as it always has. The only thing I noticed was after a short wot run and as soon as I let go the throttle it backfires. I didn't think to muck of it at the time.
Now I decide to make a run down the ice when all the problems start.
I hold the bike at wot for about 30 seconds and all is fine then all of a sudden it starts backfiring and dies. It starts back up with no problems. I take the bike home and change all the fuel over to fresh premium gas and it did make a difference. I then cleaned the Uni filter with no difference still backfiring and dieing at WOT. I changed the sparkplug and fuel filter with no change. I then pull off the fuel pump and cleaned it. It was full of mud on the vented side.
Cleaning the fuel pump did make a slight difference. The bike now does NOT backfire at WOT but it now sputters and dies at WOT after about 30 seconds.