2015 Yamaha YZF-R1
The Yamaha YFZ-R1 is back in 2015 with everything inside the engine case new from the issues from previous years’ models. The bore/stroke formula was modified (more oversquare) for increased top-end performance as the cylinders are offset toward the center of the crankshaft to reduce friction. Rocker-arms augment the shim-under-bucket valvetrain allowing for more aggressive camshaft profiles and the titanium connection rods were also installed. All told Yamaha YFZ-R1 claims the engine is 1.2 inches narrower at the crankshaft and nine pounds lighter than the 2014 model. Lastly, the six-speed transmission was revamped and is matched to a cable-actuated racing-style slipper clutch and electronic quickshifter.
After battling at the racetrack, Superbike Smackdown X moves to the street to see how the same six Superbikes perform on the open road.
|Engine Type||Inline four cylinder, DOHC, 16 valves|
|Bore Stroke||79.00 mm x 50.9 mm|
|Fuel System||Fuel Injection with YCC-T and YCC-I|
|Ignition||TCI: Transistor Controlled Ignition|
|Transmission||Six-speed w/multiplate slipper clutch|
|Final Drive||O-ring chain|
|Rake Trail||24° / 4.0 in.|
|Seat Height||33.7 in.|
|Front Suspension||43 mm KYB inverted fork; fully adjustable; 4.7 in. travel|
|Rear Suspension||KYB Single shock w/piggyback reservoir, 4-way adjustable; 4.7 in. travel|
|Front Brake||Dual 320 mm hydraulic disc; 4-piston caliper, UBS ABS|
|Rear Brake||220 mm disc; UBS ABS|
|Fuel Capacity||4.5 gal.|
|Dry Weight||439 lbs. (Wet)|
Yamaha has issued a recall through the National Highway Traffic Safety Administration for all 2015 YZF-R1 motorcycles due to a transmission issue.