The developement targets for the 2011 Yamaha R6 are to be the most exciting bike to ride on the track and the most fun sport bike to ride on winding roads. The engineers tweaked the mid range performance last year but don't worry, the high rpm rush that has made the Yamaha R6 famous is ready when you are. Confidence, agility, performance and most importantly fun. Track ready. Street smart.
The 2011 Yamaha R6 is designed to do one thing extremely well: get around a race track in minimal time. It's about a screaming, 15,000 rpm plus fuel injected four cylinder engine in a taut chassis that lets it snap from upright to full lean instantly. Oh year: It's a great street bike too.
The R6 is a showcase of Yamaha's latest sport bike technologies.
From the YCC-T fly by wire throttle to the MotoGP inspired straight frame design, to Yamaha's exclusive electronically variable intake stacks, the R6 is designed to take super sport riding to a whole new level.
ENGINE
Ultra-compact, lightweight, short stroke, 599cc, DOHC, 16-valve, liquid-cooled, in-line four-cylinder with lightweight titanium valves produces incredible horsepower. Redline is set at an amazing 16,000rpm.
67mm bore and 42.5mm stroke provide a fast revving powerplant. Engine width is minimized thanks to Yamaha's special casting technologies and "liner less" cylinder design.
Compact "pent roof" cylinder head design features ultra lightweight titanium valves for both intake and exhaust. The intake valve angle is 11.5 degrees and the exhaust is 12.25 degress. The intake valves are 27mm in diameter while the exhaust valves are 23mm.
Single intake valve springs reduce weight and "friction" for optimum high rpm performance. The valve retainers are made of lightweight aluminum.
High flow intake and exhaust ports allow more fuel in and more exhaust out for great power delivery at all rpms.
Lightweight magnesium cylinder head cover and case covers reduce weight.
Separate cylinder block (the cylinder is no longer part of the upper crankcase) design utilizes ceramic composite plated "liner less" cylinder bores. The ceramic coating is sprayed directly on the aluminum block. The benefits are greater heat dissipation for consistent power delivery, reduced frictional power loss, reduced oil consumption and since there are no heavy liners, reduced weight too.
Lightweight forged pistons feature thin top rings for great high rpm power. The pistons are secured by lightweight tapered type piston pins. The lightweight design means fast engine response.
Lightweight crankshaft features 31mm bearing journals. The inertial crank mass has been optimized for excellent throttle response and impressive acceleration. The crank journal bearings feature special oil holes that increase the supply of oil.
High lift / high performance, hollow, side-driven camshafts provide arm stretching power and strong acceleration.
Automatic semi-hydraulic type cam chain tensioner reduces mechanical noise and maintenance.
Mikuni fuel injection system with 41mm throttle bodies features twin injectors (primary & secondary). This type of twin injector system is also found on our MotoGP M1 machine and the latest generation R1. Each of the injectors utilizes 12 spray holes to maximize the atomization process. The secondary injectors, located inside the airbox, begin to function at mid rpms (6,000 to 7,000rpm) thru to redline. This system is lighter and simpler than the sub motor driven secondary valve type FI system. Special short intake tracts allow for higher rpms and improved power.
The F.I. system features separate TPS (throttle position sensor) and APS (accelerator position sensor) sensors.
Yamaha Chip Control Throttle (YCC-T) is another 1st for Yamaha. This system electronically controls the throttle valves for outstanding response and improved controllability at high rpms. The system features Throttle Position Sensor (TPS) and D.C. motor driven throttle valves. The YCC-T system electronically controls the throttle valves for outstanding response and improved controllability at all rpms. The YCC-T is used to provide even more control of the intake air volume for a smoother torque character. The YCC-T features 3 - ECU's inside the main ECU to control ignition, fuel injection and the YCC-T. This special ECU is capable of responding to changes at a speed of 1000th of a second.
YCC-I or Yamaha's Chip Controlled Intake system means the intake funnels / stacks vary in length between 2 pre-set positions depending on engine rpms. The transition rpm is approximately 13,700 rpms. An electronic servo motor varies the funnels. The revolutionary YCC-I provides the best of both worlds …solid low rpm torque and power combined with an amazing high rpm rush. It takes only 0.3 of a second for the funnels to move from the tall to the short position.
Yamaha's exclusive YCC-I electric-control servo motor-driven variable intake funnel system is a world's 1st on a production motorcycle and works in conjunction with Yamaha's fly-by-wire technology and FI systems.
7.6 litre air box utilizes a high flow viscous paper type air filter.
Ram Air Induction System with centrally located intake duct delivers cool, high-pressure air "force-fed" into the intake tract for optimal combustion and greater horsepower at higher speeds. This design provides straight induction from the central fairing duct to the airbox without a lot of bends or turns.
Close ratio 6-speed transmission delivers seamless power delivery and maximum acceleration. Gear widths, splines and engagement dogs have been optimized to handle the R6's power. The shift drum and shifting mechanism are located on the right side of the cases for smooth shifting feel under power. The gears use flat contact-type engagement dogs for positive shifting and great durability.
The "Tri-Axis" or stacked transmission design creates a more compact engine front to back that allows for optimum engine placement in the "sweet spot" of the frame for optimized weight distribution and incredible handling.
Slipper or back limiter clutch assembly reduces rear wheel hop when making hard down shifts or under hard braking. Key benefit is reduced lap times and smoother control when participating in either a race or track day. This clutch uses 9 paper based friction plates and 8 steel plates, plus 6 coil-type clutch springs.
The oil lubrication system has been optimized to reduce frictional loses caused by "oil drag". It features a "two side" oil pump. There is a separate liquid-cooled oil cooler to insure consistent engine temperatures for maximum performance and extended service life.
High capacity cooling system features a curved radiator with dual ring-type fans for excellent engine cooling efficiency. The ring-type fan offers more airflow than a conventional type fan.
Direct ignition coils, iridium dual electrode spark plugs and high-output magneto deliver reliable, super strong spark. With this system, the ignition coils are integrated into the plug caps, significantly reducing weight.
"Mid Ship" 4-into-2-into-1 exhaust maximizes engine performance. The header pipe diameter and length have been optimized for excellent flow. There are three, 3-way honeycomb catalyziers with an oxygen sensor in the system to reduce harmful HC & CO exhaust emissions. The oxygen sensor provides feedback to the ECU so it can adjust for the optimum fuel/air mixture. The "mid ship" MotoGP style, lightweight titanium muffler is located below the engine to central mass and lower the center of gravity for great handling.
The exhaust system also features Yamaha's EXUP System (Exhaust Ultimate Power Valve) utilizing a titanium body and butterfly valves that prevent the "blow back" phenomenon caused by "valve overlap". This design reduces weight and maximizes cornering clearance. The EXUP system eliminates "flat spots" in the power band and reduces emissions too. This is a 1st on a 600cc supersport machine.
High powered 32 bit electronic control unit actually contains three ECUs inside the main ECU to control the FI system, the YCC-T system and the ignition system.
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