Yamaha YZF-R3 Stock Engine Compared to a Supersport Build 2015/2017

Yamaha YZF R-3 This is an engine that was built and  tuned by Spears Racing



Stock Yamaha YZF R-3 this is a comparison between a Built Spears Racing Supersport engine and a stock engine.Engine has a fresh “Supersport” Style valve job, added compression thru a machined head, degreed stock camshafts and a M-4 Full System with the baffle.This is all done with 91 octane pump fuel.