I have a 2007 z400 quad and it's stock. It's a great quad. It has a lot of power and handles well. It is very fast; actually much faster than what I figured I would get from a 400cc. It keeps up with the 450cc's! If you you want a great quad, then this is what you want.
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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.