Motocross piston Compressor 250cc 77mm by richcoad89 3d model
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Motocross piston Compressor 250cc 77mm  by richcoad89

Motocross piston Compressor 250cc 77mm by richcoad89

by Thingiverse
Last crawled date: 3 years, 3 months ago
Most modern 250 4 stroke motorcorss bikes use the magic ratio of a 76.76mm piston and 55mm stroke ratio - CRF, KXF etc.
This is a tapered cylinder to aid compressing the rings to fit a new piston. This specific model incorporates the head dowels as locating pins to assist in aligning the ring compressor with the barrel with a Honda CRF250R 2016 model. This may fit other years and even other models, however can be used with any 76+/-1mm piston.
Print in PLA, .2mm layer hight does help create a smoother bore, however I have prototyped it a .28 and it worked fine.
This has the Hinda motorcycles logo and CRF logo embossed on the side.

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