– Yamato 331 Race Engine –

Introduced in the race stadiums in December 2014

Model 321

Model 331

The diameter of the Exhuast Pipe is reduced

Model 321                  Model 331

Thickness of the Cylinder Head is increased by 0.5

C L I C K  T O  D O W N L O A D

C L I C K  T O  D O W N L O A D

In 2017 a new Transister Ignition / Flywheel upgrade was introduced.  This produces a stronger and more reliable spark.

The 331 Flywheel (now painted black) must be used with the new style Transister Ignition.