– Yamato Model 331 Race Engine –

Introduced in the race stadiums in December 2014

The 331 comes with a Magneto & Flywheel 

upgrade which produces a stronger and more reliable spark

The diameter of the Exhuast Pipe is reduced

Model 321                  Model 331

Thickness of the Cylinder Head is increased by 0.5

We expect the first model to be shipped from the factory in late 2019

- no further production changes are planned.