Aprilia RS125: Model History & Technical Specs
The Aprilia RS125 is the definitive 2-stroke race replica. Its history is divided by two primary engine types and three distinct body styles:
The Rotax 123 Era (1992–1997):
Models: RS125R Extrema and early Chesterfield replicas.
Specs: Known for being the most powerful "stock" version, often pushing 30-33bhp. It features the SEM ignition and a more aggressive cylinder porting.
The Rotax 122 Era (1998–2011):
Models: MP Shape (1998-2005) and the RSV-style "New Shape" (2006-2011).
Specs: Switched to Nippondenso ignition. While slightly more refined, these were often restricted to 15bhp for learner laws, requiring the "Full Power" kit (RAVE valve and CDI mod) to hit 28bhp.
Key Performance Data:
Weight: ~126kg (Dry).
Top Speed: Approximately 100–105 mph (De-restricted).
Brakes: 320mm front disc with Brembo (Gold Series) or radial calipers on later models.
Chassis: Polished aluminum twin-spar frame—widely considered the best-handling 125 chassis.
The Aprilia RS125 is the definitive 2-stroke race replica. Its history is divided by two primary engine types and three distinct body styles:
The Rotax 123 Era (1992–1997):
Models: RS125R Extrema and early Chesterfield replicas.
Specs: Known for being the most powerful "stock" version, often pushing 30-33bhp. It features the SEM ignition and a more aggressive cylinder porting.
The Rotax 122 Era (1998–2011):
Models: MP Shape (1998-2005) and the RSV-style "New Shape" (2006-2011).
Specs: Switched to Nippondenso ignition. While slightly more refined, these were often restricted to 15bhp for learner laws, requiring the "Full Power" kit (RAVE valve and CDI mod) to hit 28bhp.
Key Performance Data:
Weight: ~126kg (Dry).
Top Speed: Approximately 100–105 mph (De-restricted).
Brakes: 320mm front disc with Brembo (Gold Series) or radial calipers on later models.
Chassis: Polished aluminum twin-spar frame—widely considered the best-handling 125 chassis.
see also aprilia Rs125 Race replica special edition Racing paintwork scheme models
for race replica / special editions see here
1991-97 type GS
1995-98 type MP
1999-05 type SF
2006-07 type PY
2007-08 type RD
2008-12 type RM
this model was introduced in 1992 , the main features of this model are a 34mm carb , square headlamp , three spoke wheels , air scoops on front fairing and the 123 engine .
analogue temp gauges.
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Aprilia rs125 96-98
apillia rs125 96-98 short lived model , R dropped from title , a new 122 engine used (used until rs4)
air intake moved , new style headlamp , digital temp gauge fitted .
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aprilia rs125 99-05
Aprilia rs125 99-05
fairing restyle , five spoke wheels , single r/h air duct , headlight restyle .
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Aprilia rs125 2006 on
2006 >
complete fairing restyle , headlamp restyle , digital gauges , multi spoke wheels , brake system upgrade .
2008> emissions bollox causes change in electric ignition systems from nippo denso to Piaggio .
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2012 rs4 125 4 stroke - NOT INTERESTED .
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Aprilia rs125 technical specs for all models
Aprilia rs125r extrema 92-95
ENGINE TYPE
Liquid Cooled, Single Cylinder, Two Stroke,
Reed Valves Induction
DISPLACEMENT 125cm3
BORE X STROKE 2.12X2.14 in OR 54 mm
COMPRESSION RATIO 14.5:1
HORSEPOWER 25(34)/11000 KW(hp)/RPM
TORQUE 18/9000 lb-ft/RPM OR 24/9000 Nm/RPM
FUEL SYSTEM Dell'Orto VHSB 34LD Carburetor
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6speed gearbox
FRONT SUSPENSION 40mm Upside-down Forks
REAR SUSPENSION Monoshock Absorber
FRONT BRAKE 2x320mm Discs 4 Piston Calipers
REAR BRAKE Single 240mm Disc 2 Piston Caliper
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TYRES
FRONT 110/70-17 REAR150/60-17
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Aprilia rs125 97-98
TYPE Single Cylinder Two-stroke
DISPLACEMENT 124.8 cm3
BORE X STROKE2.12X2.14 in OR 54 mm
COMPRESSION RATIO 12.5:1
HORSEPOWER 25(34)/11000 KW(hp)/RPM
TORQUE18/9000 lb-ft/RPM OR 24/9000 Nm/RPM
FUEL SYSTEM
Dell’Orto PHBH 28 BD
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TRANSMISSION
GEARBOX 6 Speed
CLUTCH Multiple Discs In Oil Bath
PRIMARY DRIVE Gear
FINAL DRIVE Chain
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CHASSIS
FRAME Cast Aluminium Sloping Twin-spar With Thin Walled Structural Shell And Cross Rib Reinforcement
FRONT SUSPENSION Upside-down Hydraulic Action Telescopic Fork
REAR SUSPENSION Cast Aluminium Swing-arm With Asymmetrical Members
FRONT BRAKE Floating 320 Mm Disc
REAR BRAKE Disc Brake, 220 Mm
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DIMENSION
OVERALL LENGTH 76.8 in OR 1951 mm
OVERALL WIDTH 28.3 in OR 719 mm
SEAT HEIGHT 44.7 in OR 1135 mm
WEELBASE 53 in OR 1346 mm
GROUND CLEARANCE- WEIGHT 313.1 lbs OR 142 kg
FUEL CAPACITY 3.7 gallons OR 3.7 L
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TYRES
FRONT 110/70 ZR 17
REAR 150/60 ZR 17
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aprilia 1999-2005 stats
ENGINE TYPE Single Cylinder Two-stroke
DISPLACEMENT1 24.8 cm3BORE X STROKE2.12X2.14 in OR 54 mm
COMPRESSION RATIO 12.5:1 HORSEPOWER25(34)/11000 KW(hp)/RPM
TORQUE 15/9000 lb-ft/RPM OR 20/9000 Nm/RPM
FUEL SYSTEM Dell’Orto PHBH 28 BD
TRANSMISSION GEARBOX 6 Speed CLUTCH Multiple Discs In Oil Bath PRIMARY DRIVEGear FINAL DRIVEChain
CHASSIS FRAME Cast Aluminium
REAR SUSPENSION Swinging Fork With Two Asymmetric Arms In Aluminium Fusion With Thin-walled Monocoq
FRONT BRAKE Single 320mm Disc 4 Piston Caliper
REAR BRAKESingle 220mm Disc 1 Piston Caliper
DIMENSION OVERALL LENGTH 76.8 in OR 1951 mm
OVERALL WIDTH 28.3 in OR 719 mm
SEAT HEIGHT 44.7 in OR 1135 mm
WEELBASE53 in OR 1346 mm
WEIGHT 313.1 lbs OR 142 kg
FUEL CAPACITY 3.7 gallons OR 3.7 L
TYRES FRONT110/70 ZR 17 REAR150/60 ZR 17
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.jpg "Aprilia Rs125 model History and Specs")
Aprilia rs125 2006>
engine Single Cylinder Two-stroke
DISPLACEMENT 124.8 cm3
BORE X STROKE2.12X2.14 in OR 54 mm
COMPRESSION RATIO 12.5:1
HORSEPOWER 25(34)/11000 KW(hp)/RPM
TORQUE 15/9000 lb-ft/RPM OR 20/9000 Nm/RPM
FUEL SYSTEM Dell’Orto PHBH 28 BD
TRANSMISSION
GEARBOX 6 Speed
CLUTCH Multiple Discs In Oil
PRIMARY DRIVE Gear
FINAL DRIVE Chain
FRAME Cast Aluminium
FRONT SUSPENSION Upside-down Hydraulic Action Telescopic Fork
REAR SUSPENSIONCast Aluminium Box Section Swingarm With Asymmetric Members
FRONT BRAKE Single 320mm Disc 4 Piston Caliper
REAR BRAKESingle 220mm Disc 1 Piston Caliper
DIMENSION
OVERALL LENGTH 76.9 in OR 1953 mm
OVERALL WIDTH 28.3 in OR 719 mm
SEAT HEIGHT 43.3 in OR 1100 mm
WEELBASE 52.9 in OR 1344 mm
WEIGHT 313.1 lbs OR 142 kg
FUEL CAPACITY 3.7 gallons OR 3.7 L
TYRES FRONT110/70 ZR 17 REAR150/60 ZR 17
see more Aprilia RS 125 posts here
ENGINE TYPE Single Cylinder Two-stroke
DISPLACEMENT1 24.8 cm3BORE X STROKE2.12X2.14 in OR 54 mm
COMPRESSION RATIO 12.5:1 HORSEPOWER25(34)/11000 KW(hp)/RPM
TORQUE 15/9000 lb-ft/RPM OR 20/9000 Nm/RPM
FUEL SYSTEM Dell’Orto PHBH 28 BD
TRANSMISSION GEARBOX 6 Speed CLUTCH Multiple Discs In Oil Bath PRIMARY DRIVEGear FINAL DRIVEChain
CHASSIS FRAME Cast Aluminium
REAR SUSPENSION Swinging Fork With Two Asymmetric Arms In Aluminium Fusion With Thin-walled Monocoq
FRONT BRAKE Single 320mm Disc 4 Piston Caliper
REAR BRAKESingle 220mm Disc 1 Piston Caliper
DIMENSION OVERALL LENGTH 76.8 in OR 1951 mm
OVERALL WIDTH 28.3 in OR 719 mm
SEAT HEIGHT 44.7 in OR 1135 mm
WEELBASE53 in OR 1346 mm
WEIGHT 313.1 lbs OR 142 kg
FUEL CAPACITY 3.7 gallons OR 3.7 L
TYRES FRONT110/70 ZR 17 REAR150/60 ZR 17
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.jpg "Aprilia Rs125 model History and Specs")
Aprilia rs125 2006>
engine Single Cylinder Two-stroke
DISPLACEMENT 124.8 cm3
BORE X STROKE2.12X2.14 in OR 54 mm
COMPRESSION RATIO 12.5:1
HORSEPOWER 25(34)/11000 KW(hp)/RPM
TORQUE 15/9000 lb-ft/RPM OR 20/9000 Nm/RPM
FUEL SYSTEM Dell’Orto PHBH 28 BD
TRANSMISSION
GEARBOX 6 Speed
CLUTCH Multiple Discs In Oil
PRIMARY DRIVE Gear
FINAL DRIVE Chain
FRAME Cast Aluminium
FRONT SUSPENSION Upside-down Hydraulic Action Telescopic Fork
REAR SUSPENSIONCast Aluminium Box Section Swingarm With Asymmetric Members
FRONT BRAKE Single 320mm Disc 4 Piston Caliper
REAR BRAKESingle 220mm Disc 1 Piston Caliper
DIMENSION
OVERALL LENGTH 76.9 in OR 1953 mm
OVERALL WIDTH 28.3 in OR 719 mm
SEAT HEIGHT 43.3 in OR 1100 mm
WEELBASE 52.9 in OR 1344 mm
WEIGHT 313.1 lbs OR 142 kg
FUEL CAPACITY 3.7 gallons OR 3.7 L
TYRES FRONT110/70 ZR 17 REAR150/60 ZR 17
see more Aprilia RS 125 posts here
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