How was a 400cc class machine allowed to compete ... noise complaints from nearby neighbors. Will the XEMX Yamaha XE4 ...

the company looked for opportunities to expand its horizons and saw opportunity after the introduction of Yamaha's first 400cc 4-stroke bike, a groundbreaking model for dirt bikes in 1997.

Over the years, Yamaha’s Yard Built program has seen some ... And let me tell you; that’s no easy feat! The stock bike is powered by a liquid-cooled parallel-twin that prides itself on a ...

XEMX makes two separate conversion kits (the air-cooled XE2 and liquid-cooled XE4) for Yamaha's YZ250F and YZ450F dirt bikes, but the brand is currently only accepting pre-orders for the XE4 model.