Mike Fortin sent us some pics of his personal conversion kit just released for existing O.S.91HZ motors. Check it out!!

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The single most important engine upgrade you can do to an OS91 HZ is the new HZ-R conversion that has recently been released by OS Engines.  After 6 years in the making both Steve Helms of Futaba/OS and James O’neal of OMI collaborated to what is clearly to be the best engine OS has ever produced.

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Source: Mike3D

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