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The complete MR NINJA engine line was born from an absolute new and high-tech industrial project, realized in Italy by GRP, under the technological supervision of Mario ROSSI. The complete MR NINJA engine line was born from an absolute new and high-tech industrial project, realized in Italy by GRP, under the technological supervision of Mario ROSSI. Thanks to the technological and futuristic research centre at GRP, the very first projects were realized, and it will allow a continuous future product development. Everything has been studied with the most up-to-date and advanced software of mechanical simulation, to know and reproduce the conditions of use and deformation of components and materials at high temperatures. All components (even the ones apparently less important) have been meticulously studied and the result has confirmed a very high basic quality that will set a new worldwide standard quality in this field. The look and packaging for mechanical components which are normally neglected, have been studied here in details to guarantee a truly complete product. Each single engine is delivered with protection cover for exhaust, intake fuel entrance and carburetor. *Displacement 3.49 ccm *Rotation max. 43.000 rpm *Stroke 16.79 mm *Bore 16.27 mm *Ports 5 *Sleeve ABC *Crankshaft Diam. 14 mm *Glow Plug Type Conical *Exhaust Rear *Carb. Diameter 7.5 mm var. *Carb. Material Aluminium *Adjustment Single *Weight 363 g