Aprilia RX 125 (1988-90)

The Aprilia RX 125 Six days Model L was a motorcycle produced between 1988 and 1990. It featured a single cylinder, two-stroke engine with a Rotax 123 and Gilardoni cylinder/head, a capacity of 124.8cc, and a compression ratio of 11.5:1. The cooling system was liquid cooled and the induction used a VHSB34 LD carburetor. The bike had a kick start and a maximum power output of 24.2 kW at 10800 rpm and a max torque of 20.6 Nm at 10500 rpm. The transmission had six speeds and the final drive was a #520 chain. Front suspension was provided by a Marzocci upside-down fork and rear suspension was a swingarm with a single shock absorber. The bike had single disc brakes, measuring 250mm at the front and 220mm at the rear. The front and rear tires were 90/90-21 and 120/90-18, respectively. The wet weight was 115kg and the fuel capacity was 9L. The bike achieved an average consumption of 5.5L/100km and had a top speed of 132.2 km/h. In a Motosprint 1990 Group Test, it completed the standing 1/4 mile in 15.2 seconds and reached a top speed of 82.1 mph. Braking from 60 km/h took 14.8 meters and from 100 km/h took 43.1 meters.

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Technical specifications:

Make Model: Aprilia RX 125 Six days Model L

Year: 1988 – 90

Engine: Single cylinder, two stroke, Rotax 123 with Gilardoni cylinder/head

Capacity: 124.8 cc / 7.6 cu in

Bore x Stroke: 54 x 54.5 mm

Compression Ratio: 11.5:1

Cooling System: Liquid cooled

Induction: VHSB34 LD carburetor

Starting: Kick

Max Power: 24.2 kW / 32.4 [email protected] 10800 rpm

Max Torque: 20.6 Nm / 2.1 kgf-m / 15.2 lb-ft @ 10500 rpm

Transmission: 6 Speed

Final Drive: #520 Chain, 12T to 17T pinion gears, 49 T spur gear

Front Suspension: Marzocci upside down fork

Rear Suspension: Swingarm with single shock absorber, Aprilia Progressive system with compression extension, adjustable, Boge Sachs shock absorber

Front Brakes: Single disc, 250 mm

Rear Brakes: Single disc, 220 mm

Front Tyre: 90/90-21

Rear Tyre: 120/90-18

Wet Weight: 115 kg / 253.5 lbs

Fuel Capacity: 9 L / 2.4 US gal / 2.0 Imp gal

Consumption Average: 5.5 L/100 km / 18.2 km/l / 42.8 US mpg / 51.4 Imp mpg

Braking 60 km/h / 32 mph – 0: 14.8 m / 48.6 ft

Braking 100 km/h / 67 mph – 0: 43.1 m / 141.4 ft

Standing 1/4 Mile: 15.2 sec / 131.4 km/h / 81.6 mph

Top Speed: 132.2 km/h / 82.1 mph

Road Test: Motosprint 1990 Group Test