RIDEFAST DECEMBER 2021

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S E F M // // // // // // // Kawasaki has also employed a new rear shock absorber set up. Compared to Kawasaki’s traditional Uni-Trak rear suspension, which mounts the shock unit vertically, with the new Horizontal Back-link rear suspension, the shock unit is almost horizontal. Kawasaki’s original suspension arrangement locates the shock unit very close to the bike’s centre of gravity, greatly contributing to mass centralisation. And because there is no linkage or shock unit protruding beneath the swingarm, this frees up space for a larger exhaust pre-chamber, (an exhaust expansion chamber situated just upstream of the silencer). With a larger pre-chamber, silencer volume can be reduced, and heavy exhaust components can be concentrated closer to the centre of the bike, further contributing to mass centralisation. The result is greatly improved handling. Another benefit is that the shock unit is placed far away from exhaust heat. Because it is more difficult for heat from the exhaust system to adversely affect suspension oil and gas pressure, suspension performance is more stable. The Horizontal Backlink rear suspension offers numerous secondary benefits like this that really just make the 650 Ninja so rideable. It encourages you to push the limits of the bike as well as your skill levels. Another great feature is the slipper clutch. Based on feedback from racing, the Assist & Slipper Clutch uses two types of cams, (an assist cam and a slipper cam), to either drive the clutch hub and operating plate together or apart. Under normal operation, the assist cam functions as a self-servo mechanism, pulling the clutch hub and operating plate together to compress the clutch plates. This allows the total clutch spring load to be reduced, resulting in a lighter clutch lever feel when operating the clutch. And that lighter clutch feel is really noticeable when doing the daily grind through rush hour traffic, your left hand doesn’t get as tired or sore. Then, when excessive engine braking occurs as a result of quick downshifts or an accidental downshift, the slipper cam comes into play, forcing the clutch hub and operating plate apart. This relieves pressure on the clutch plates to reduce back-torque and helps prevent the rear tyre from hopping and skidding and creating the need for a clean set of rods. This race-style function is particularly useful when sport or track riding. The Dual Throttle Valves offer increased power and greater ease of use care of a second set of ECU-controlled throttle valves. Late-model sport bikes often use largebore throttle bodies to generate high levels of power. However, with large diameter throttles, when a rider suddenly opens the throttle, the unrestricted torque response can be strong. Dual throttle valve technology was designed to tame engine response while contributing to performance. On models with dual throttle valves, there are two throttle valves per cylinder: in addition to the main valves, which are physically linked to the throttle grip and controlled by the rider, a second set of valves, opened and closed by the ECU, precisely regulates intake airflow to ensure a natural, linear response. With the air passing through the throttle bodies becoming smoother, combustion efficiency in improved and power is increased. The Economical Riding Indicator is a mark appearing on the instrument panel to indicate favourable fuel consumption, encouraging fuel efficient riding… needless to say, we studiously ignored this feature and just gave the 650 some space to fill her lungs and shout at the world and stretch her legs. 24 RIDEFAST MAGAZINE DECEMBER 2021
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RIDEFAST DECEMBER 2021

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