in process . At the same speed the threshold is reduced if ABS is activated , to a negative acceleration of a minimum 2.5m / s2 .
They also auto-cancel ; rather than using a simple timer , the system compares front and rear wheel speed difference and calculates when to cancel the indication relative to the situation .
Starting from a clean piece of paper , Honda ’ s development engineers set out to build a brand new twincylinder engine to power both the street fighting CB750 Hornet and adventuresome XL750 Transalp .
The resulting 755c , 8-valve Unicam unit has bore and stroke set at 87 x 63.5mm , with compression ratio of 11.0:1 . It produces a hard hit of top end power , with maximum output of 67.5kW @ 9,500rpm . This is accompanied by mountains of usable torque in the low to mid rpm range , rising to a peak of 75Nm @ 7,250rpm . The result is an engine that provides usable , enjoyable performance for rides of all types and all distances , and for riders of all experience levels .
The new engine is extremely compact and lightweight , due in no small part to the Unicam head ( as used by the MX competition ready CRF450R ) which operates the 35.5mm diameter inlet valves ( with 9.3mm lift ) via cam , and 29mm diameter exhaust ( with 8.2mm lift ) by rocker arm .
The compact dimensions are also due to clever packaging : there ’ s no balancer drive gear since the primary drive gear doubles up duties and also spins the balance shaft ; the water pump is tucked away inside the lefthand engine cover and there ’ s no need for a watercooled oil-cooler .
For razor-sharp pick-up and throttle response , patented Vortex flow ducts create a more uniform distribution from the side scoops into the airbox , which then feeds downdraft intakes and 46mm diameter throttle bodies . The cylinders use a Ni-SiC ( Nickel- Silicon Carbide ) coating , as used on the CRF450R and CBR1000RR-R Fireblade , to increase the engine ’ s efficiency .
The crank uses a 270 ° firing order for characterful , twin-cylinder pulse feeling . The exhaust note is tuned for a pleasing low-end beat and raucous top-end howl .
While mechanically identical , the Transalp ’ s engine TBW settings are tuned differently to focus on an engine ‘ flavour ’ in keeping with the long distance , touring work for which the Transalp will be the ideal machine .
An assist / slipper clutch – with F . C . C Leaning Segment ( FLS ) discs – reduces clutch drag torque by 30 %, for a lighter lever load and easier up shifts . It also manages rear wheel hop under hard braking and rapid down changes .
Fuel consumption of 23 . km / l ( WMTC mode ) offers a potential range of 390km from the 16.9L fuel tank . And just like the Hornet , a 35kW , A2 licence option will also be available through a quick ECU remap at a Honda dealer .
Throttle By Wire ( TBW ) engine control offers four default riding modes : SPORT , STANDARD , RAIN and GRAVEL , adjusting the engine ’ s performance delivery and feel to suit conditions and the rider ’ s intent ; they ’ re easily switched and managed between the left handlebar mode and TFT screen . There is also a specific USER mode that allows the rider to fine tune their own personal settings
There are 4 levels of Engine Power ( EP ), 3 levels of Engine Brake ( EB ), 2 levels of ABS , and 5 levels of Honda Selectable Torque Control ( HSTC ) available ; HSTC and rear ABS can also be switched off . The riding modes offer different combinations of each parameter . Wheelie Control is also standard and integrated to HSTC .
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