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Technical
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Honda GB 350S
Air-cooled, SOHC the 348cc HSTC-equipped engine produces 15.5kW peak power with 29.0Nm of torque, focussed in the low- to mid-range. But it’s also an engine – long-stroke, with heavy flywheel mass – tuned to feel exactly like a single-cylinder should, with character and sound that’s unmistakeable. The wide-ratio, five-speed gearbox is managed by assist/slipper clutch for fuss free gear changes.
The GB350S is a bike made to navigate busy city streets with ease. The steel semi-double cradle frame provides stable, confident handling, the overall geometry gives a tight turning radius; both centre of gravity and seat height are reassuringly low. 41mm telescopic forks and twin rear shocks provide supple suspension, with braking taken care of by 310mm front/ 240mmm rear discs and ABS control. Wheels are a 19/17-inch front and rear combination.
Deliberately understated styling pays homage to
Honda’s illustrious roadster history with steel fuel tank, resin side panels
and front mudguard, and stylish blacked out detailing on the engine and
cycle parts. All lighting is LED, led by a circular headlight, while a
compact analogue speedometer is at the centre of an attractive instrument
display. A range of genuine Honda accessories are ready to go for the GB350S, and include large and small saddle bags, a variety of screen options and engine side pipes.
Key Features
Honda Selectable Torque Control (HSTC)
The exhaust note was also factored in right at
the start of development. The downpipe is double skinned while the muffler
(chamfered for improved lean angle with 45mm diameter tail pipe) uses a
single expansion chamber; the resulting sound is a distinct, characterful
bass beat – just right for a single.
Peak power of 15.5kW is delivered at 5,500rpm
with peak torque of 29.0Nm arriving low down in the rpm range at 3,000rpm.
Its architecture is long stroke with bore and stroke set at 70mm x 90.5mm
and compression ratio of 9.5:1.
And while it has a classic look, a host of
Honda’s latest low-friction technologies – like a 10mm offset cylinder,
asymmetric con-rod and sealed crankcases – are all built in to deliver
optimum fuel efficiency. To achieve both oil capacity and reduced crankshaft
oil mixing resistance in limited space, the sealed crankcase uses a bulkhead
between the transmission chambers and crankcase.
The five-speed gearbox uses wide gear ratios
between first and fourth, to make the best use of the torque delivery around
town, with fifth set for wide-ranging acceleration from 30km/low rpm up to
cruising speed. An aluminium cam assist/slipper clutch reduces lever load by
30%, easing around-town riding and upshifts while controlling the rear wheel
under braking and downshifting.
Chassis
Fittingly, a classic steel tube cradle frame
provides just the right look for the GB350S. It balances longitudinal,
lateral and torsional rigidity and draws out the suppleness of steel for
perfect feel. The rigid swingarm is constructed from 60 x 30mm box section
steel, for efficient torque transfer.
The steering geometry, low centre of gravity,
low seat height and wide pull-back handlebars make for stable – yet easy –
handling. A 43° steering angle delivers a 2.3m minimum turning radius, for
urban manoeuvrability. 41mm telescopic forks offer 106mm stroke and, with an
eye on classic details, wear protective black rubber gaiters. Twin rear
shocks also deliver 120mm travel and are nitrogen gas charged for enhanced
damping control.
A single 310mm front disc is worked by a newly
designed, and highly rigid, twin-piston caliper, the rear 240mm disc by
single-piston caliper. Long-life friction material is used for the brake
pads; the compact ABS modulator simplifies the hydraulic system for the rear
brake. Wheels are elegant 14-spoke cast aluminium; the front ABS pulsar ring
is minimised to accentuate the slender spokes and the 19-inch front is
matched to a 17-inch rear. Tyres are Metzeler Tourance Next sized 100/90-R19
front and 150/70-R17 rear.
Styling & Equipment
The GB350S’s outline is the very definition of a
clean and simple Honda roadster, with straightforward, timeless style that
harks back to the iconic designs of the past. The shaping of the fuel tank
and resin side panels – and the proportion between them – are evocative, as
is the low ‘tuck-roll’ seat profile. Matching nimble front and rear
mudguards are quality finishing touches.
Straightforward instrumentation is provided by
compact, analogue speedometer offset from the ignition; a digital gear
indicator is included as well as average/instantaneous fuel consumption,
distance to empty and ECO indicator. The rear indicators also incorporate an Emergency Stop Signal (ESS) function. Under hard braking, the hazard lights flash to warn other road users a hard stop is in process. The indicators 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.
Accessories
The line-up is completed with optional Heated
Grips (with five heat levels of adjustment), a practical USB charger and a
Meter Visor (short version of the long visor).
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Any corrections or more information on these motorcycles will be kindly appreciated. |