Forza 350 SE (25YM)

Engine

• 330cc engine puts out 21.5Kw peak power with 31.5Nm torque 
• enhanced Smart Power+ (eSP+) technology ensures fuel economy of 30km/l (WMTC mode)
• New ECU settings, catalyser, muffler internals and SO2 sensor

The Forza 350’s eSP+ engine achieves both high environmental performance and strong output characteristic through comprehensive adoption of technologies for friction reduction.

Liquid-cooled the 330cc, fuel injected SOHC four­valve unit produces peak power of 21.5kW @ 7,500rpm, with maximum torque of 31.5Nm @ 5,250rpm. Top speed is 137km/h and, from a standing start, the Forza 350 will cover 200m in 10.4s.

Bore is set at 77mm with stroke of 70.7mm; compression ratio is set at 10.5:1. Roller­type rocker arm, plain journal crank bearings and sealed crankcases deliver long-term reliability together with strong performance. To enhance piston cooling, an oil jet, as used on the CRF450R, sprays oil right to the back of the piston, advancing ignition timing and improving combustion performance. Oil capacity is 1.8 litres.

Air is supplied via a 5.5 litre airbox which feeds a 36mm throttle body. The intake port draws air efficiently, utilising a ‘tumble’ flow within the cylinder for more consistent fuel combustion. Exhaust gases are expelled via a straight exhaust port and, to reduce exhaust gas resistance, the muffler consists of two distinct chambers.

Internal friction is reduced through a 5mm offset cylinder, a hydraulic cam chain adjuster and the use of a scavenger pump. Used on high performance machines, the pump lowers the internal pressure within the engine, reduces oil agitation and decreases pumping losses and internal rotational friction. A balancer shaft further reduces vibration and contributes to a smooth enjoyable ride.

An automatic centrifugal clutch works a V­Matic transmission (with ratios set for fast low speed reaction and smart acceleration) and belt final drive.

The Forza 350’s engine is equipped with Honda Selectable Torque Control (HSTC). The system detects any difference between the front and rear wheel speeds, calculates the slip ratio and then controls engine torque via the fuel injection to regain rear wheel traction. HSTC can be switched ON/ ­OFF via a switch on the left handlebar. A ‘T’ indicator in the digital display flickers when the system is working to manage grip.

Alongside updated ECU settings the muffler’s internal structure has been revised, the catalyser upgraded and an SO2 sensor added to ensure Euro 5+ compliance. Fuel economy is a frugal 30km/l (WMTC mode); the 11.7L tank capacity gives a potential 340km+ range.

Chassis

• Short wheelbase with sharp steering geometry
• Compact body dimensions paired with practical seat height
• Both wheels cast aluminium; 14-inch diameter rear and 15­inch front

A sturdy, yet lightweight, tubular steel frame is at the heart of the Forza 350’s reassuring feel on the road. Wheelbase is set at 1510mm, with rake at 26.5° and trail 89mm. The radiator is in front of the fuel tank for better cooling performance, and the battery is found between the fuel tank and the under-seat storage area, focusing mass to the centre. Wet weight is 186kg.

Seat height is 780mm and the riding position naturally upright, promoting excellent all­ round visibility. Handlebar width is 754mm, with front width of 580mm and mirror width of 860mm; compact dimensions that make slipping through traffic heavy streets easy.

Rigid 33mm telescopic forks are matched by twin rear shock absorbers – adjustable through seven­stage spring preload – working through one­piece aluminium swingarm.

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