Yamaha Y15ZR

Replacing the 135 model. It had a brand new 150cc liquid-cooled engine (the previous had a 135cc liquid-cooled engine), combined with a 5-speed constant mesh manual transmission.

This bike received an update, with some design changes and new technologies (LED headlights, LCD instrument panel, passing button, on/off engine switch and Answer back key).

A brand new version was released in Vietnam, called the 155 VVA. It had a new 155cc engine with VVA "Variable Valve Actuation" technology developed from the R15 that according to Yamaha Vietnam was 17% more powerful than the 150cc engine version, a new 6-speed constant mesh manual transmission and a…