The frame is the most expensive part to replace if it is damaged.
: Pull the dipstick. Oil should be transparent to dark brown. Avoid ATVs with "milky" oil (indicates a blown head gasket/water in engine) or metallic flakes (indicates internal wear).
: For liquid-cooled models, ensure the coolant is bright green or orange and not cloudy. 3. Suspension and Drivetrain
: Open the gas cap and smell the fuel. A "sour" smell indicates old gas and potential carburetor or fuel injector issues. Look for rust or sediment inside the tank.
: Check the underside and around A-arms for warping or deep rust that could compromise safety.
When buying a used ATV, a thorough inspection is critical to avoid expensive "hidden" repairs. This checklist covers the vital mechanical, structural, and legal points you should verify before handing over any cash. 1. Frame and Chassis
: Use a flashlight to inspect all welds and joints for cracks or signs of re-welding.
: Look for "caked-on" mud or painted-over rust, which can hide structural rot. 2. Engine and Fluids