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2012 Aprilia RS4 125 Overview
Aprilia RS4 125 is a sport motorcycle, displacing 124.8 cc. Power comes from a Four stroke, single cylinder, DOHC, 4 valves engine, a compression ratio of 12.5 ± 0.5:1. On the performance side, it delivers 11.7 kW @ 10500 rpm of peak power and 11 Nm @ 8500 rpm of torque. On the road, the 2012 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. The full 2012 Aprilia RS4 125 spec sheet below covers every technical detail, from suspension travel to tyre sizes.
2012 Aprilia RS4 125 compared with other bikes in the Sport category
We checked the recorded figures for the 2012 Aprilia RS4 125 against up to 2003 bikes in the Sport category in our database, counting each model once at the model year nearest to this one.
- Only 68 of the other 1572 bikes in the Sport category have a lower torque than the 11 Nm of the RS4 125.
- With 11.7 kW, the RS4 125 has the joint 68th lowest power output of 1341 bikes in the Sport category, 84% below the category average of 75.2 kW.
- Engine displacement of 125 cc is smaller than that of 1829 of the other 2002 bikes in the Sport category.
- Narrowing the field to the 627 models within five model years of it, the torque of 11 Nm is lower than that of 568 of the other 626.
Versus the 2011 model
The figures we track are unchanged from the 2011 model: peak power, peak torque, displacement and seat height all match.
2012 RS4 125 - Pros & Cons
Strengths
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Strong power output: With 11.7 kW @ 10500 rpm and 11 Nm @ 8500 rpm of torque on tap, the RS4 125 is no slouch for its class.
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🔧
Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
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Strong front braking: Stopping power up front is strong thanks to the disc setup, with plenty of room to upgrade further with braided lines.
Considerations
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Tall seat height: At 820 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
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Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.
Wear Points & Servicing Notes
Cooling system servicing
RS4 125's Liquid cooled setup is low-maintenance provided the coolant interval is kept - old, acidic coolant is the main cause of long-term corrosion in the water passages.
Fuelling & injector care
The Electronic injection on the RS4 125 needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.
Brake disc and pad wear
Braking up front comes from single Ø300 mm disc, 4 piston caliper - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.
Suspension condition on used examples
The RS4 125's suspension runs ø41 mm Upside down fork at the front. The rear uses Asymmetric swingarm with monoshock. Fork-seal condition and rear linkage play are the two things worth checking before buying used.
Final drive maintenance
The RS4 125 uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.
Frame & chassis check
Built around an Aluminum perimeter frame, the RS4 125's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.
Low-speed handling
122 kg keeps the RS4 125 easy to move around in tight spaces, car parks and on the stand alike.
RS4 125 - Buying & Maintenance Guide
What to check before buying
Before handing over money for a used 2012 Aprilia RS4 125 with its 124.8 cc sport, cover the fundamentals: service book and oil change history, drivetrain wear, and any sign of oil weeping around the casings. 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 14 years old, this sport is as likely to show age-related wear (perished rubber, seized fasteners, degraded seals) as mileage-related wear. Cold-starting it yourself tells you a lot - a healthy RS4 125 should catch quickly and settle into a smooth idle.
Oil and filter changes
Nothing protects the RS4 125's 124.8 cc four stroke, single cylinder, dohc, 4 valves like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). 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. Match the viscosity grade to what the owner's manual specifies, not what's cheapest.
Fuel system care
Fuel injection on the RS4 125 needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.
2012 Aprilia RS4 125 - Frequently Asked Questions
What engine does the 2012 Aprilia RS4 125 have?
The 2012 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 2012 Aprilia RS4 125 weigh?
The 2012 Aprilia RS4 125 weighs 122 kg. This is the manufacturer's dry figure.
How much power does the 2012 Aprilia RS4 125 make?
The 2012 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 2012 Aprilia RS4 125?
The 2012 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 2012 Aprilia RS4 125 suitable for shorter riders?
The 2012 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 2012 Aprilia RS4 125 have?
The 2012 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 2012 Aprilia RS4 125 use?
The 2012 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 2012 Aprilia RS4 125 have?
The 2012 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 2012 Aprilia RS4 125 Specifications
Year
2012 - 13
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
Coolant Capacity
0.8 Liters
Oil Capacity
1.2 Liters
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
Fuel Reserve
3.5 Liters / 0.9 gal
Ignition
Electronic with CDI capacity discharge
Lubrication System
Wet sump
Spark Plug
NGK CR9EB
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
Rake
25°
Trail
94 mm / 3.7 in
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
Wheel size
Front 2.75 x 17 / Rear 3.50 x 17
Wheels
Light alloy with 6 split spokes
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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