2015 Stock Yamaha YZF R-3, This is a comparison between a Built Spears Racing Supersport engine.Engine has a fresh "Supersport" Style valve job,added compression thru a machined head,degreed camshafts and a  M-4 Full System with the baffle.This is all done with 91octain pump fuel.


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Superbike Yamaha YZF R-3: This is an engine that was Built by Spears Racing and shipped to Guatemala to our dealer to install and dyno.Great results, engine has the following: SP01-320 Pistons,SP17-320 camshafts,Ported cylinder head,SP02-320 MWR air filter,

colder NGK spark plugs,M-4 exhaust,Spears Bored Throttle Bodies.The fuel was a 108 octane race fuel.Lots of dyno time 

This is also the engine the has set a new lap record.Congrats to Mike and his rider.


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2015 Race Yamaha YZF R-3: This is several dyno runs done on a "Superflow" Dyno,According to the tuner there is approximately a "low" of 10% compaired to  Dyno Jet numbers. The engine is a Stock lower end, pistons and rods, with a Spears Racing ported head and Spears SP17-320 camshafts (degreed in),aftermarket race exhaust system,Spears Emission Block Off Plate  and a BMC race air filter.Building of this engine and all of the tuning is done by Mike@ Taylor Motorsport in St.Louis MO.


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2015 Stock Yamaha YZF R-3, This is a comparison between the Yoshimura R-77 Full System with and without the baffle, the "Red" Line shows before,the "Blue" is with the baffle installed  both runs had a PCV .The "red" line has the new race air filter and re-mapped .Stock Engine Pump Fuel.This is the run time, it shows the the bike will rev to the Peak RWHP faster now that it has been tuned Properly.





2015 Stock Yamaha YZF R-3, This is a comparison between the Yoshimura R-77 Full System with and without the baffle, the "Red" Line shows before,the "Blue" is with the baffle installed  both runs had a PCV .The "red" line has the new race air filter and re-mapped .Stock Engine Pump Fuel





2015 Stock Yamaha YZF R-3, This is a comparison between the "stock first run" and the latest Dyno work done.The second graph is a Stock exhaust,stock engine 87 octane fuel,our 415 chain conversion kit 18/56 sprockets  Power Commander V ,and a lot of Dyno time.





2015 Stock Yamaha YZF R-3, This was done as the first run, engine has 4 heat cycles on it, Stock exhaust, all components are stock on 87 Fuel.











 YZF R-3 Dyno Sheets 


2015 Stock Yamaha YZF R-3, This is a comparison between the M-4 Full System with the baffle and OEM Stock. "Blue" is "stock "," Red" is with a PCV ,M-4 Full system,Pump Fuel.