The Suzuki GSX-R series has defined sportbike performance for over 30 years, with more than a million sold worldwide. So the dedicated Suzuki engineers who have devoted their lives to the GSX-R take their responsibilities very seriously: Every GSX-R must be very light and the best performing in its class, in an unbeatable package. Meet the revolutionary Suzuki GSX-R125, with the best power to weight ratio, torque to weight ratio and acceleration, plus nimble handling and great fuel economy in the 125cc class. It’s versatile too, designed to handle city traffic jams while commuting to school or work during the week. And as an exciting sportsbike it’s ready for fun rides into the countryside on weekend. The combination of lightweight chassis and smooth power delivery mean this GSX-R is read for the racetrack as well.
The power plant for the new GSX-R125 is a single cylinder, liquid cooled, DOHC (Double Over Head Cam) with 125cc. It powers the GSX-R to great performance on the track and on the street and a lot more besides. The engineers behind the GSX-R series have been perfecting engines for over 30 years, and this is their latest masterpiece. In the 125cc class the GSX-R125 has the best power to weight ratio, the best torque to weight ratio and the best acceleration. So the rider can enjoy the most fun and excitement, every corner, every straight and every ride. This level of performance is well known for a GSX-R, but beyond the power and acceleration there is even more too, this engine is also extremely fuel efficient as well, so you can travel further on each tank of fuel before its time to re-fill.
There is a science to building high-performance engines, and the GSX-R125’s DOHC engine is a perfect example of how to make a lot of power out of a very efficient and compact power plant. The objective is combustion efficiency, optimal balance of the sporty engine character and fuel economy. There is a connection between the GSX-R125 and the race proven four cylinder GSX-R600 sold around the world, because the GSX-R125’s single cylinder is almost one quarter of a GSX-R600. Although Suzuki engineers experimented with different bore and stroke figures to find the most efficient combination for the GSX-R125, the two engines both use an over-square design, with a larger bore and a shorter stroke, and have a similar bore x stroke ratio. The GSX-R125 engine displaces an actual 125cc from a 62mm cylinder bore and a 41.2mm piston stroke. The larger bore makes room for two 24mm intake valves and two 21mm exhaust valves, set upright at narrow angles to improve the shape of the combustion chamber, increasing the compression ratio, performance and fuel economy. The cylinder bore is plated with Suzuki’s own race-proven nickel-phosphorus-silicon-carbide bore coating known as SCEM (Suzuki Composite Electrochemical Material). An aluminium cylinder plated with SCEM weighs much less than an aluminium cylinder fitted with a conventional, pressed-in cast-iron liner, while also reducing friction and improving durability, ring seal, heat transfer and the engine’s ability to maintain consistent high-power output.
An effective liquid-cooling system with a large radiator helps keep the engine at the optimum temperature, producing consistent performance and maximising fuel efficiency and mileage. The engine makes its high horsepower and reaches its generous torque, delivering strong, effective power across a broad rpm range. And the GSX-R125 comes with a smooth-shifting 6-speed transmission and an electric starter.
The GSX-R125 features advanced electronic fuel injection, which delivers fuel based on what the rider is doing with the twist-grip throttle as well as input from sensors monitoring engine rpm, intake air pressure and temperature, exhaust oxygen content and coolant temperature. To improve intake efficiency, throttle response, and engine power throughout the rpm range, the GSX-R125 has a 32mm throttle body. A dual-spray, four-hole injector aims the spray from two holes directly at the intake valves. Ample intake air is supplied by a large-capacity airbox and efficient filter. The accurate electronic fuel injection system contributes to the GSX-R125’s outstanding fuel efficiency.
Advanced Electronic Fuel Injection
Efficient Liquid Cooling
The chassis design of the GSX-R125 is light and compact, giving the rider ultimate control in the corners for a fun and sporty ride. For a sports bike low weight is key, this helps deliver a bike with responsive and rewarding handling for added confidence on the street and low lap times on the track. The Engineers behind the GSX-R125 have created the lightest bike in the 125cc class, giving the rider the edge over the competition. As well as being the lightest machine in class the GSX-R125 also has the lowest seat height too, making an unbeatable combination for accessibility for all types of rider, while still maintaining a sportsbike stance and riding position. The low seat height means most riders will be able place both feet securely on the floor for added confidence, while the light weight makes the bike easy to manage both on the move and for slow speed manoeuvers.
Contributing to the bikes low weight are the 10 spoke cast aluminium wheels. Having light weight wheels helps ensure great handling, for a ride that’s fun and a machine that goes exactly where you want it to. The slim design of the spokes also adds to this GSX-R’s great sportsbike looks, along with the sporty petal type brake discs front and rear.
The GSX-R125’s confidence-inspiring stability, nimble handling in turns comes in part from its steel-tube backbone frame, which combines optimal torsional rigidity with light weight. This helps the GSX-R’s impressive chassis specification of; compact 1300mm wheelbase, 134 kg ready to ride kerb weight, and a low seat height of just 785mm.
The Anti-lock Brake System (ABS) is the latest Bosch ABS 10 base unit, which is the lightest and most compact two-channel ABS system on the market. The pro-active system monitors wheel speed and immediately intervenes when imminent wheel lock is detected-before actual lock-up. The compact ABS system as installed on the GSX-R125 weighs just 0.59 kilograms.* The sporty-looking petal-design 290mm front disc works with a dual-piston caliper and the 187mm petal-design rear disc works with a single-piston caliper, both delivering excellent braking performance.
*ABS is not designed to shorten the braking distance. ABS cannot prevent wheel skidding caused by braking while cornering. Please drive carefully and do not overly rely on ABS.
Light, Compact Chassis
Light Aluminium Wheels
The GSX-R125 features a convenient key-less ignition system, and the rider can start the engine as long as the compact key is close enough to the motorcycle. Which means the rider doesn’t have to fumble to retrieve the compact key from a pocket or backpack. A button on the remote control activates an answer-back function, causing the turn signals to flash and making it easier to find the GSX-R125 in a crowded car park.
The ECM on the GSX-R125 runs the one-touch Suzuki Easy Start system. The convenient Suzuki Easy Start System automatically starts the engine with one touch of the starter button mounted in the switch module on the right handlebar; there’s no need to hold the button down until the engine fires. Thanks to the new system, the rider doesn’t have to pull the clutch lever in to start the engine, as long as the transmission is in neutral.
Suzuki Easy Start System
To make the best use of every ounce of power from the GSX-R125’s class leading engine, the bikes sporty bodywork is also extremely aerodynamically efficient to reduce drag and maximise efficient speed. This design is the result of extensive wind tunnel development, and the sleek bodywork also enhances the GSX-R125’s easy handling character. Furthermore, it also has the smallest projected frontal area in the 125cc class helping to achieve that best in class acceleration and supports high levels of fuel efficiency.
Reflecting its GSX-R heritage, the GSX-R125 features vertically stacked LED headlights, with the low beam above the high beam, and position lights on each side of the headlight. The GSX-R125’s LED headlights are bright and compact, lighter and longer lasting compared to conventional halogen-bulb headlights seen on competing machines. Because LED headlights use about 15% of the electrical power required by conventional bulbs, less engine power is needed to run the motorcycle’s alternator, improving acceleration and fuel economy. The LED license plate light on the rear fender is light and compact and much more durable and vibration resistant than the conventional bulb lights installed on competing 125cc machines.
The Suzuki GSX-R125 has a full LCD instrument panel set in a modern dashboard, framed by turn signal, neutral, hi-beam, coolant temperature, malfunction indicator lamp (MIL), ABS, and programmable engine-RPM indicator lights. The bright LCD panel includes a segmented-bar tachometer across the top; a digital speedometer; a gear position indicator; a digital clock; a digital odometer with dual trip meters; an average fuel consumption meter; a fuel gauge; and an oil change timing indicator.
|Engine capacity||124 cc||Engine||4-stroke, 1-cylinder, liquid-cooled, DOHC|
|Bore||62.0 mm x 41.2 mm (2.4 in x 1.6 in)||Compression ratio||11.0 : 1|
|Lubrication||Wet sump||Ignition||Electronic ignition|
|Fuel system||Fuel injection||Transmission||6-speed, constant mesh|
|Power||11.0 kW @ 10,000rpm (15 PS)||Torque||11.5 Nm @ 8,000rpm (8.48 lb. ft)†|
11.0litres (2.4 UK gallons)
4-stroke, 1-cylinder, liquid-cooled, DOHC
62.0mm x 41.2mm (2.4 in x 1.6 in)
6-speed, constant mesh
Telescopic, coil spring, oil damped
Link type, coil spring, oil damped
†Power and torque conversions to imperial/metric units (in brackets) are approximate and included as a guide only.
|34 monthly payments||£89.28|
Includes VED and First Registration fee
|Total amount of credit||£3,072.00|
Included in the final payment
|Total amount payable||£3714.08|
|Duration of agreement||36 months|
|Annual Percentage Rate||3.0%|
Subscribe to the J W Groombridge newsletter.
We offer a 'While U Wait' MOT test, click here to book.