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RCRenew OS .21 Power Backplate
OS Power backplate improves efficiency of the engine adding power and mileage using special air ports in the backplate to channel crankcase air fuel mixture.

Fits OS Based .21  engines ( BLOK, Protek, OS, Maxima, BUllit, etc...) with 26mm diameter backplate. Comes with O-Ring.

Please measure before you order to make sure it fits your model.
$39.99
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