– Yamato Model 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

The 331 comes with a Transister Ignition & Flywheel 

upgrade which produces a stronger and more reliable spark.

The 331 Flywheel (now painted black) is required with the new style Transister Ignition.