– Yamato 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

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 - painted black - MUST be used with the new style Transister Ignition.