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2011 Aprilia RS4 125 Overview
The 2011 Aprilia RS4 125 is a sport motorcycle built around 124.8 cc of displacement. Under the tank sits a Four stroke, single cylinder, DOHC, 4 valves engine, a compression ratio of 12.5 ± 0.5:1. 2011 Aprilia RS4 125 delivers 11.7 kW @ 10500 rpm of peak power and 11 Nm @ 8500 rpm of torque. From a practical standpoint, the 2011 RS4 125 tips the scales at 122 kg, carries a 14.5-litre fuel tank, offers a seat height of 820 mm and spans a 1350 mm wheelbase. Scroll down for the complete 2011 Aprilia RS4 125 spec sheet covering every technical detail from suspension travel to tyre sizes.
2011 Aprilia RS4 125 compared with other bikes in the Sport category
Here is how the 2011 Aprilia RS4 125 stacks up against other bikes in the Sport category in our database. Each model counts once, using the model year closest to this one, and the comparison covers up to 2003 models.
- Torque of 11 Nm is lower than that of 1504 of the other 1572 bikes in the Sport category.
- Only 67 of the other 1340 bikes in the Sport category have a lower power output than the 11.7 kW of the RS4 125.
- With 125 cc, the RS4 125 has the joint 157th smallest engine displacement of 2003 bikes in the Sport category, 82% below the category average of 706 cc.
- Narrowing the field to the 605 models within five model years of it, the torque of 11 Nm is lower than that of 554 of the other 604.
2011 RS4 125 - Pros & Cons
Strengths
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Strong power output: 2011 Aprilia RS4 125 makes 11.7 kW @ 10500 rpm with 11 Nm @ 8500 rpm of torque - competitive figures for its class.
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Fuel injection: The Electronic injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
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Strong front braking: The disc front brake gives excellent stopping power and responds well to aftermarket braided lines.
Considerations
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Tall seat height: The 820 mm seat height will challenge shorter riders - tiptoeing at low speeds is something to factor into your decision.
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Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.
Wear Points & Servicing Notes
Cooling system servicing
The Liquid cooled system on the RS4 125 needs a coolant change roughly every two years (or per the service schedule) - skipping it lets the coolant turn acidic and corrode the aluminium water passages over time.
Fuelling & injector care
Fuelling comes from Electronic injection. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.
Brake disc and pad wear
The disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the RS4 125 runs ø41 mm Upside down fork and Asymmetric swingarm with monoshock at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.
Frame & chassis check
The frame is Aluminum perimeter frame - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
Low-speed handling
At just 122 kg, the RS4 125 is light enough to manhandle easily at a standstill - one of the practical advantages of its class.
RS4 125 - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2011 Aprilia RS4 125 with its 124.8 cc sport, start with the basics: check the service book for oil change frequency, inspect the drivetrain for wear, and look for oil seepage around the engine casings and rocker covers. This model runs chain final drive, so check chain slack and sprocket tooth profile specifically - a worn sprocket is a cheaper fix now than after it's chewed up the next chain. Now 15 years old, this sport is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. A cold start test is invaluable - a well-maintained RS4 125 should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task for the RS4 125's 124.8 cc four stroke, single cylinder, dohc, 4 valves. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. With a 12.5 ± 0.5:1 compression ratio, running the octane grade specified in the manual matters more than on a lower-compression engine. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The RS4 125's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
2011 Aprilia RS4 125 - Frequently Asked Questions
What engine does the 2011 Aprilia RS4 125 have?
The 2011 Aprilia RS4 125 uses a Four stroke, single cylinder, DOHC, 4 valves engine with 124.8 cc of displacement. It is liquid cooled.
How much does the 2011 Aprilia RS4 125 weigh?
The 2011 Aprilia RS4 125 weighs 122 kg. This is the manufacturer's dry figure.
How much power does the 2011 Aprilia RS4 125 make?
The 2011 Aprilia RS4 125 produces 11.7 kW @ 10500 rpm of power and 11 Nm @ 8500 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2011 Aprilia RS4 125?
The 2011 Aprilia RS4 125 has a 14.5-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 241-290 km between stops.
Is the 2011 Aprilia RS4 125 suitable for shorter riders?
The 2011 Aprilia RS4 125 has a seat height of 820 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2011 Aprilia RS4 125 have?
The 2011 Aprilia RS4 125 uses single Ø300 mm disc, 4 piston caliper at the front and single Ø218 mm disc, 1 piston caliper at the rear.
What tyre sizes does the 2011 Aprilia RS4 125 use?
The 2011 Aprilia RS4 125 runs 110/80 -17 front and 130/70 -17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2011 Aprilia RS4 125 have?
The 2011 Aprilia RS4 125 is fitted with a 6 Speed transmission.
Aprilia RS4 125 Spec Evolution
The Aprilia RS4 125 was produced across 6 model years (2011-2020). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2011 |
2013 |
2015 |
2016 |
2018 |
2020 |
| Fuel Capacity |
14.5 Liters / 3.8 gal |
14.5 Liters / 3.8 gal |
14.5 Liters / 3.8 gal |
14.5 Liters / 3.8 US gal |
14.5 Litres / 3.8 US gal |
14.5 Litres / 3.8 US gal |
| Brakes - Front |
Single Ø300 mm disc, 4 piston caliper |
Single Ø300 mm disc, 4 piston caliper |
Single Ø300 mm disc, 4 piston caliper |
Single Ø300 mm disc, 4 piston caliper |
Single 300 mm disc, 4 piston caliper |
Single 300 mm disc, 4 piston caliper |
| Wheelbase |
1350 mm / 53.1 in |
1350 mm / 53.1 in |
1350 mm / 53.1 in |
1350 mm / 53.1 in |
1353 mm / 53.2 in |
1353 mm / 53.2 in |
| Brakes - Rear |
Single Ø218 mm disc, 1 piston caliper |
Single Ø218 mm disc, 1 piston caliper |
Single Ø218 mm disc, 1 piston caliper |
Single Ø218 mm disc, 1 piston caliper |
Single 218 mm disc, 1 piston caliper |
Single 218 mm disc, 1 piston caliper |
| Final Drive |
Chain |
Chain |
Chain |
Chain |
Chain: 60/13 (4.61) |
Chain: 60/13 (4.61) |
| Height |
1138 mm / 44.6 in |
1138 mm / 44.6 in |
1138 mm / 44.6 in |
1138 mm / 44.6 in |
1135 mm / 44.6 in |
1135 mm / 44.6 in |
| Gear Ratios |
1st 11/33 (0.33) / 2nd 15/30 (0.50) / 3rd 18/27 (0.67) / 4th 20/24 (0.83) / 5th 25/27 (0.92) / 6th 23/22 (1.05) |
1st 11/33 (0.33) / 2nd 15/30 (0.50) / 3rd 18/27 (0.67) / 4th 20/24 (0.83) / 5th 25/27 (0.92) / 6th 23/22 (1.05) |
1st 11/33 (0.33) / 2nd 15/30 (0.50) / 3rd 18/27 (0.67) / 4th 20/24 (0.83) / 5th 25/27 (0.92) / 6th 23/22 (1.05) |
1st 11/33 (0.33) / 2nd 15/30 (0.50) / 3rd 18/27 (0.67) / 4th 20/24 (0.83) / 5th 25/27 (0.92) / 6th 23/22 (1.05) |
1st 11/33 (0.33) 2nd 15/30 (0.50) 3rd 18/27 (0.67) 4th 20/24 (0.83) 5th 25/27 (0.92) 6th 23/22 (1.05) |
1st 11/33 (0.33) 2nd 15/30 (0.50) 3rd 18/27 (0.67) 4th 20/24 (0.83) 5th 25/27 (0.92) 6th 23/22 (1.05) |
| Width |
740 mm / 29.1 in |
740 mm / 29.1 in |
740 mm / 29.1 in |
740 mm / 29.1 in |
760 mm / 29.9 in |
760 mm / 29.9 in |
Key Specifications
Engine
Four stroke, single cylinder, DOHC, 4 valves
Power
11.7 kW / 16 hp @ 10500 rpm
Torque
11 Nm / 1.12 kgf-m / 8.1 ft/lb @ 8500 rpm
Fuel Capacity
14.5 Liters / 3.8 gal
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Full 2011 Aprilia RS4 125 Specifications
Year
2011
Model
RS4 125
Make Model
Aprilia RS4 125
Seat Height
820 mm / 32.3 in
Wheelbase
1350 mm / 53.1 in
Height
1138 mm / 44.6 in
Length
1953 mm / 76.8 in
Width
740 mm / 29.1 in
Dry Weight
122 kg / 269 lbs
Fuel Capacity
14.5 Liters / 3.8 gal
Displacement
124.8 cc / 7.6 cu in
Engine Detail
Four stroke, single cylinder, DOHC, 4 valves
Bore x Stroke
58 X 47 mm
Compression Ratio
12.5 ± 0.5:1
Cooling System
Liquid cooled
Emissions
Euro 3
Fuel Induction
Electronic injection
Ignition
Electronic with CDI capacity discharge
Starter
Electric
Clutch
Multiple discs, in oil bath
Final Drive
Chain
Gear Ratios
1st 11/33 (0.33) / 2nd 15/30 (0.50) / 3rd 18/27 (0.67) / 4th 20/24 (0.83) / 5th 25/27 (0.92) / 6th 23/22 (1.05)
Transmission / Drive
6 Speed
Frame Type
Aluminum perimeter frame
Suspension - Front
ø41 mm Upside down fork
Suspension - Rear
Asymmetric swingarm with monoshock
Wheel Travel - Front
110 mm / 4.3 in
Wheel Travel - Rear
130 mm / 5.1 in
ECU
Magneti Marelli MIU G3, Ø32 mm
Brakes - Front
Single Ø300 mm disc, 4 piston caliper
Brakes - Rear
Single Ø218 mm disc, 1 piston caliper
Tyres - Front
110/80 -17
Tyres - Rear
130/70 -17
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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