As for whether the fuel needs to be premixed, it will depend on the type of engine the quad has. Most modern Suzuki 4WD quads have four-stroke engines, which do not require the fuel to be premixed with oil. However, some older Suzuki 4WD quads may have two-stroke engines, which do require the fuel to be premixed with oil. If the quad has a two-stroke engine, the owner's manual will specify the correct ratio of oil to mix with the gasoline.