Honda’s Variable Valve Timing and Lift Electronic Control (VTEC) was used in cars in the 1980s and first appeared on bikes in the Japan-only CB400 in 1989, but it wasn’t until the 2002 VFR800 VTEC that it gained notoriety. Like most motors, the VFR has two overhead cams that operate two intake and two exhaust valves per cylinder with a bucket and shim-style valve train. Below 7000rpm a hydraulically-operated pin inside the valve lifter bucket of one intake and one exhaust valve is moved aside by oil pressure. This allows the bucket to move up and down under the cam without operating the valve, effectively making the engine a two-valve motor. Above 7000rpm, the oil pressure is released and a spring forces the pin back into the path of the valve stem, allowing the cam to operate the valves again and returning the engine to four-valve. In theory, a two-valve motor gives better low-end performance while a four-valve one is better at high revs, so a VTEC engine gives you the best of both worlds.