Sportsman 90 idles wont rev

Hi there,

Have you check the valves and the valve gaps?? Sometimes but not always having the wrong valve gaps can cause backfires. Have you also tried tweaking the carburetor to try and improve the idle??

Get the ..throttle positchion sensor tested .

I know virtually nothing about a 2005 Polaris 90 Sportsman, but your problem sounds like it could be a fuel starvation problem. Check the fuel filter (assuming it has one!). Good luck!

Check the Flywheel key. It should be locked under the pull cord, where the stator is located. I will be a small piece of metal that slides into the spline from the engine and the stator. If it is worn the stator will rotate off the spline and the timing will be off, she won't start and if she does will be really rough and backfire, sputter and have power loss.

clean your carb, look for air leaks between motor and air filter.

Just a couple of ideas:
- Make sure the air filter is clean.
- Check the mixture. If it's too rich it won't rev like it should
- Check the timing. If it's retarded it won't rev like it should.

the fuel doesn`t pass, the fuel jet clogged ,try to cleaned the carb very nice ,allow small jet and little orifice nozzle in a (soaking bath cleaner.( OVERNIGHT)Do not use wire or .wire brush

how old is the fuel you are running

make sure filter is clean not gunked up..try draining carb if there is a plug if not.Then try to clean the carb the jets could be clogged not hard at all to take apart.Good luck

All most positive it is in your carb take the bowl off it as you take it off there is a small tube that hangs down that all most reaches the bottom of the bowl need to take a small wire and push through it it is blocked .symptoms backfiring no idle coughing and sputtering if it does start