i am (hopefully) going to buy a sport atv this summer. i would mainly be trail riding, no racing but i still like power.  i was looking at the 400ex because of the easy maintenance but i heard its a little underpowered? which sport atv is the easiest for maintenance other then the 400ex? are the other 400's and 450's alot more powerful thenthe ex?

the 400ex will do what you want with great power. as long as you dont weigh 800 pounds

the 400ex is a great quad maybe not a ton of power on the tracck but loads for trails and loads of fun,the suzuki ltz400<--i think thats what its called is also a good relaiable engine as i think its the same as in the drz400,but i would buy the 400 any day over similar makes/sizes,just my opinion,i ride a blaster(when i get tired of my dirtbikes) and its loads of fun and maintenance is reasonably cheap but its not really comparable to a 400/450,