Hi all! I purchased my son a sportsman 300 4x4. It was purchased new in Jan of 2011. This thing is a real billy goat on the trails. With the narrow width and short wheel base it climbs over some stuff better than my longer wheel base 550. The only issue I have is it seems to have a severe lack of power and has since day one. I dont mean it runs bad its just a dog when it comes to throttle response and overall performance. Its like the exhaust or air filter is clogged causing the engine to really labor to make revs. I removed the air filter in the driveway and tried to start it to see if there was some kind of restriction and it wouldnt even start. I reinstalled the air filter and started it then removed the air filter while it was running and it died. I've owned 4 stroke 250 motorcycles in the past and they rev and have tons of power. I know this atv weighs much more than a typical motorcycle but its not a weight issue I'm dealing with. The throttle response from idle to WOT takes 3-4 seconds. If anyone has any suggestions let me know and thanks for reading my post!