Have an 06 Sportsman 450. It runs perfect except for when climbing a hill or when i was hitting the snow a few months back it would bog down buried and i would give it gas. All this in high range, now problems in low. Its as if its starving for fuel on the hills. Checked spark plug and air filter. Thanks

 

Did you have the ECM replaced yet?
There is a recall ..I would start there first...........Caper.............

 

check your fuel filter, if thats not it, check your float level and needle and seat in the carburetor

 

I agree with Caper, check the ECM. We just had ours replaced. I do remember several
times it losing power on hills etc. a couple times of its freaky cut outs. RAD was not blocked
or HOT, filters all clean, really in great running condition. I NOW BELIEVE ALL OF THAT WAS
ECM related. -IMHO

After a little carb cleaning, throttle adjustments and the ECM replacement, man this thing runs
GREAT!

R'