I've owned my 2000 400 EX for over a year now. I bought it box-stock used and in very good condition. Since the purchase, I have put on a set of AC nerfs and a set of Bandit XC tires on all around (22" in rear and 23" in front). I use the quad primarily for rocky trail rides here in NM.
I love the power and speed of this machine. It is nimble and fast. I stand 5' 9" tall, and find my ride position to be very comfortable. Ground clearance is acceptable, and I have no trouble keeping up with my 4WD riding buddies--even in snow and mud! The air cooled 4 stroke is a very dependable/bullet proof engine, and other than oil changes, I have done nothing to it.
All and all--out of the box, the 400 EX is the most fun you can have on 4 wheels--add some cheap aftermarket parts, and you'll be unstoppable.
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ATV Disclaimer & Safety Information
Riding an ATV can be dangerous. To ensure your safety proper protective gear should always be worn. Remember to always wear a helmet, eye protection and protective clothing. Never ride on paved surfaces or public roads. Never carry passengers unless the ATV is specifically engineered to accommodate them. Riding at excessive speeds or engaging in stunt riding is extremely dangerous. Be extremely careful on difficult or unknown terrain. Never ride while under the influence of drugs or alcohol.
Many ATV’s are recommended only for highly experienced riders 16 years and older. Please make sure that you are riding an ATV that is age appropriate. Riders younger than 16 years of age should always be supervised by an adult. We recommend that all ATV riders take an approved ATV training course and read their vehicle owner's manual thoroughly. When riding your ATV always stay on established trails in approved areas. Keep your riding areas clean and respect the rights of others. Always obtain permission before riding on private lands, and obey all the laws and regulations governing your riding areas.