My 2010 Polaris Sportsman 500 is having trouble pulling its own weight and I am wondering if it has something to do with the elevation? It starts and idles fine, and even revs up while sitting still (though this is not instantaneous) but once in gear, it has difficulty accelerating - certainly it has difficulty pulling itself up even a slight incline;

I have tried the typical: taking the exhaust off to see if its a backpressure problem; cleaning the breather filter and removing the breather totally; removing the fuel filter; insuring the fuel is flowing thru the fuel line and fuel shutoff valve;

The "airjet" has a number on it: "1.3" stamped in it;
The "Main fuel jet" has an "R" and "122.5" stamped in it;

both the air and fuel jets have a "square" stamped in them with a smaller "square" inside the larger (in the bottom left hand side) ...

my question is simply, could this be an altitude problem and if so, are there different jets that I could thread into the ports to quickly remedy this problem? If so, what are the specs for the new jets?

 

welcome to the forum matt-

I'm not 100% sure on this but- I think you have to lean the carb out and increse your compression ratio (via head gasket?) for high altitudes (low air density) riding- For the problems you're describing, this could be the case. I would just call polaris and ask them for a smaller main jet- and what their advice is... I would just buy an entire main jet kit so you can fine tune it- shouold be cheap if you do it yourself.

 

Hi, anyone have any info? Remove and cleaned my carb on a 2004 600 sportsman, when started it Idles very Hi with choke in, pull choke out it runs idles nice. Cable and spring installed correctly. Any Help? Thanks Paul

 

help with what? sounds like it's runnung the way it shoild

the motor should "idle" high with the choke on-

 

Let me put this another way, when The choke **** is stowed, pushed all the way in on the panel, the engine idles hi. **** extended out, the engine idle's just right. Backwards, I'm going to take the carb off and ck the jets again,i guess.