[Motofool]

Valves opening higher and longer at high rpm's: Easier breathing.
It was invented by Honda engineer Ikuo Kajitani.
It has been used in motorcycles and cars.

Copied from here:
https://en.wikipedia.org/wiki/VTEC

VTEC in motorcycles

Apart from the Japanese market-only Honda CB400SF Super Four HYPER VTEC, introduced in 1999, the first worldwide implementation of VTEC technology in a motorcycle occurred with the introduction of Honda's VFR800 sportbike in 2002. Similar to the SOHC VTEC-E style, one intake valve remains closed until a threshold of 7000 RPM is reached, then the second valve is opened by an oil-pressure actuated pin. The dwell of the valves remains unchanged, as in the automobile VTEC-E, and little extra power is produced, but with a smoothing-out of the torque curve. Critics maintain that VTEC adds little to the VFR experience, while increasing the engine's complexity. Honda seemed to agree, as their VFR1200, a model announced in October 2009, came to replace the VFR800, which abandons the V-TEC concept in favor of a large capacity narrow-vee "unicam", i.e., SOHC, engine. However, the 2014 VFR800 reintroduced the VTEC system from the 2002-2009 VFR motorcycle.

Honda incorporated the technology into the NC700 series, including the NC700D Integra (motorcycle/scooter hybrid), released in 2012, using a single camshaft to provide two timing routines for the intake valves.

Link to original page on YouTube.

Link to original page on YouTube.