Forza 125 SE (25YM)

Engine

• 125cc engine produces 10.7kW peak power with 12.3Nm torque
• The fuel-efficient unit uses Honda’s eSP technologies, plus Idling Stop
• New ECU settings, revised exhaust muffler and SO2 sensor
• 41.7km/l gives range of nearly 500km between fill-ups
• Honda Selectable Torque Control (HSTC) increases rider confidence

The enhanced Smart Power+ (eSP+) four-valve, water-cooled SOHC powerplant delivers 10.7kW @ 8,750rpm, with peak torque of 12.3Nm @ 6,500rpm. Bore and stroke is set at 53.5 x 55.5mm with compression ratio of 11.5:1.

From a standing start the Forza 125 accelerates rapidly (0-200m covered in just 13.3s) while sharp mid-range makes for responsive roll-on performance in the typical 40-60km/h around-town speed range. It will cruise happily around 90km/h and V-max is 108km/h.

Honda’s eSP+ low-friction technologies are found throughout the engine. A compact combustion chamber and PGM-FI fuel injection – fed by 4.7-litre airbox and 26mm diameter inlet duct – optimise combustion velocity and cooling performance. Clever packaging of items like the oil pump (which is built into the crankcase) help to further heighten the efficiency.

An offset cylinder reduces friction caused by contact between piston and bore, efficiently transmitting combustion energy to the crankshaft. A ‘spiny’ cast-iron sleeve – with tiny surface extensions – keeps in check any distortion of the inner bore diameter. This design lowers tension in the piston ring, reducing friction.

A high-efficiency radiator – integrated into the exterior of the right-side crankcase – employs a small, light fan that reduces frictional losses and lowers drag. Rolling resistance within the transmission unit is reduced by the use of three low-friction main bearings, all designed to deal with the loads they individually receive. The drive pulley features a fin design that lowers air resistance, and the follower pulley reduces pressure on the drive belt, cutting transmission losses.

The electronically controlled, brushless ACG starter is an integrated component mounted directly on the end of the crankshaft, serving as starter motor and alternator. It spins the engine directly, eliminating any noise from gear engagement or meshing.

Idling Stop automatically stops the engine running after three seconds at idle when the Forza is stationary, and the brakes applied and re-starts it instantly when the throttle grip is twisted. It’s seamless in use thanks to ACG and the swing-back system that returns the crank to its position before air intake, and a decompression mechanism that negates cranking resistance from compression. It has the functionality to ‘read’ the battery charge and turns itself off to avoid excessive drain.

One of the original aims of the Forza 125 is that the trip to the fuel station should happen just once a week for the average user, and a near 500km tank range is possible thanks to the engine’s fuel efficiency of approximately 41.7km/l (WMTC mode) and 11.7litre tank.

Alongside updated ECU settings the muffler’s internal structure has been revised and an SO2 sensor added to ensure Euro 5+ compliance.

Chassis

• Tubular steel frame, 33mm telescopic forks and preload adjustable twin shocks
• Wet weight of just 164kg aids agility and ease of use
• Cast aluminium wheels, front and rear disc brakes, ABS fitted as standard

The tubular steel frame that underpins the Forza 125’s chassis provides the necessary rigidity and strength for the broad variety of riding conditions it will face. Sturdy 33mm telescopic forks are matched by twin rear shock absorbers – adjustable through five-stage spring preload – working through a one-piece aluminium swingarm.

The Forza 125’s light weight, just 164kg, makes it easy to manage at walking speeds, and easy to park. A wheelbase of 1,505mm provides stability; the steering geometry – 26.5° rake and 89mm trail – delivers nimble steering.

The cast aluminium 15-inch front wheel is fitted with a 120/70-15 tyre while the 14-inch rear wears a 140/70-14 tyre, offering maximum traction and ride comfort. A large 256mm single disc performs stopping duties up front, mated to a 240mm rear, with the benefit of ABS for extra braking control on slippery surfaces.