– Yamato Model 331 Race Engine –

Introduced in the race stadiums in December 2014

Model 321

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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.