Derbi GPR125

The Derbi GPR 125 is a street motorcycle sold by Derbi - Nacional Motor since 2005.[2] The original GPR125 was powered by a single-cylinder two-stroke engine with a steel lined cast iron cylinder manufactured by Yamaha, but was superseded in 2010 by an all-new DOHC four-stroke four-valve model.[3]

GPR 125 Racing
ManufacturerDerbi
Also calledGilera SC125
Parent companyPiaggio
Production2005–
ClassSport bike
Engine125 cc (7.6 cu in)
2005-2009: liquid cooled, two stroke[1]
2010-: liquid cooled four stroke[2]
Bore / stroke2005-2009: 56.0 mm × 50.7 mm (2.20 in × 2.00 in)
2010-: 58.0 mm × 47.0 mm (2.28 in × 1.85 in)
Transmission6-speed
SuspensionØ40 mm upside-down fork. 110 mm. travel
Rear: Monoshock. 110 mm travel, Adjustable Preload
BrakesFront: Single 300 mm Hydraulic Disc with Four Piston Radial Caliper
Rear: Single 180 mm Disc with Two-Piston Caliper
TiresFront: 110/70-17
Rear: 140/70-17
Wheelbase53.34 in (1,355 mm)
DimensionsL: 79.68 in (2,024 mm)
W: 28.34 in (720 mm)
H: 45.66 in (1,160 mm)
Weight225 lb (102 kg) (dry)
285 lb (129 kg) (wet)
Fuel capacity3.4 US gallons (13 L; 2.8 imp gal)
RelatedDerbi GPR 125 Nude, Derbi GPR 50 Racing & Nude, Gilera SC 125 & Moto 125sc

Two-stroke GPR125

The engine in the original two-stroke model is sourced from Yamaha. This engine was used in the Yamaha DTR125 Dual Sport and TZR125 sport bike. Engine parts from these two bikes will directly swap with the Derbi. It uses the Yamaha Yamaha Power Valve System, a two-stroke power valve system, which consists of a rotary valve located in the exhaust port which changes the exhaust port timing and area. The power valve is controlled by an ECU and servo motor.

Four-stroke GPR125

In 2010 the engine was changed to a new four-stroke engine.[3] The single cylinder engine features double overhead camshafts and four valves.[4]

References
  1. "GPR 125 (2005 - present) review". Visordown. 1 January 2005. Retrieved 14 May 2019.
  2. "DERBI GPR125 (2005-2009) Review". Motorcycle News. 23 November 2006. Retrieved 13 May 2019.
  3. "DERBI GPR125 (2010-on) Review". Motorcycle News. 23 July 2010. Retrieved 13 May 2019.
  4. "2013 Derbi GPR 125". www.topspeed.com. 30 June 2013. Retrieved 14 May 2019.
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