Aprilia RS4 125

The Aprilia RS4 125 is a 125cc class sportbike manufactured by Italian motorcycle firm Aprilia. The RS4 125 is a four-stroke variant of the extremely popular RS125 two-stroke race replica. The bike is based on the four-stroke version of the Derbi GPR125.[3] A race kit is available from the manufacturer that boosts power from the standard 15 bhp to 25 bhp.[3]

Aprilia RS4 125
ManufacturerAprilia
Parent companyPiaggio
Productionsince 2011
PredecessorAprilia RS125
Classsport bike
Engine124.2 cc (8 cu in) Single-Cylinder DOHC[1] four valve four-stroke
Transmission6 speed, multi-disk oil bath clutch
BrakesFront: Single 300 mm diameter stainless steel disc, radial 4-piston caliper
Rear: 218 mm diameter stainless steel disc, single 30 mm piston caliper
Bosch Single Channel ABS[2]
TiresFront: 100/80 - 17",
Rear: 130/70 - 17"
Wheelbase1353 mm
DimensionsL: 1968 mm
W: 760 mm
H: 1135 mm
Seat height820 mm (32 in)
Fuel capacity14.5 L (3.2 imp gal; 3.8 US gal)
Reserve: 3.5 L (0.77 imp gal; 0.92 US gal)
RelatedAprilia RS125, Aprilia RS4 50

Specifications

The RS4 125 is available with a quick-shift system similar to the RSV4, in which the engine halts the torque from the engine based on engine rpm, the amount of throttle being applied, and the speed of the bike. This system allows smooth, fast upshifts without the use of the clutch. The powerplant is an electronically fuel-injected 4 stroke 4 valve DOHC single cylinder, with a balance shaft.[4] The chassis is very high-spec, with an aluminium perimeter frame and aluminium swingarm. The brakes are also high-spec, with a 30 cm steel disc in front with a four-piston radial caliper and a 22 cm steel disc with a single caliper at the rear. Complementing this for 2017 is Bosch single channel ABS.[2]

Notes and references
  1. "RS4 125 - Aprilia". Aprilia. Archived from the original on 20 June 2016. Retrieved 18 September 2018.
  2. "Aprilia RS125 Technical Specification" (PDF). Aprilia. Retrieved 18 September 2018.
  3. Ash, Kevin (20 June 2011). "Aprilia RS4 125 review" – via www.telegraph.co.uk.
  4. "APRILIA RS125 (2017-on) Review".
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