Gilera ER 125

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Gilera ER 125
Production 1987
Class Enduro
Single cylinder, two stroke, air cooled
Bore / Stroke 55.9mm x 55.9mm
Compression ratio 13.4:1
Horsepower 20.65 HP (15.4 KW) @ 9200RPM
Torque 11.06 ft/lbs (15.0 Nm) @ 8800RPM
Transmission Gear box: 6-Speed

Final Drive: Chain

Clutch: Wet multi disc
Suspension Front: Telescopic fork
Rear: Alloy swing arm adjustable single shock
Brakes Front: Single disc 240 mm
Rear: Drum
Front Tire 2.75-21
Rear Tire 4.60-17
Weight 132.0 kg (wet)
Fuel Capacity 1.06 Gallon (4.00 Liters)
Manuals Service Manual

The Gilera ER 125 was a Single cylinder, two stroke, air cooled Enduro motorcycle produced by Gilera in 1987. Max torque was 11.06 ft/lbs (15.0 Nm) @ 8800 RPM. Claimed horsepower was 20.65 HP (15.4 KW) @ 9200 RPM.


A 55.9mm bore x 55.9mm stroke result in a displacement of just 124.0 cubic centimeters.


The bike has a 6-Speed transmission. Power was moderated via the Wet multi disc.


It came with a 2.75-21 front tire and a 4.60-17 rear tire. Stopping was achieved via Single disc 240 mm in the front and a Drum in the rear. The front suspension was a Telescopic fork while the rear was equipped with a Alloy swing arm adjustable single shock. The ER 125 was fitted with a 1.06 Gallon (4.00 Liters) fuel tank.

1987 Gilera ER 125[edit]

1987 Gilera ER 125 1987 Gilera ER 125

The engine is the latest evolution of the KZ / KK road engine and is equipped with an APTS mechanical exhaust valve. Compared to the cousin, the engine adopts a new heat pump, a different carburetor for the Dell'Orto PHBH 28 carburetor and a new exhaust system suitable for an enduro. Obviously there are different internal and external gear ratios. The tests detect a maximum wheel power of 21.95 cv and a maximum speed of 133.3 km / h.