1988 Aprilia AF1 125 Sintesi

Make Model	Aprilia AF1 125 Sintesi
Year	1988
Engine	Two stroke, single cylinder, light alloy, barrel with Gilnisil coating
Capacity	124.7 cc / 7.6 cu in
Bore x Stroke	54 x 54.5 mm
Compression Ratio	15.1:1
Cooling System	Liquid cooled
Induction	Dell'Orto carburetor, Ø 28 mm
Ignition	Electronic
Starting	Electric
Max Power	21.4 kW / 28.66 hp @10500 rpm
Max Torque	18.6 Nm / 1.9 kgf-m / 13.7 lb-ft @ 10000 rpm
Transmission	6 Speed
Final Drive	Chain
Front Suspension	Telescopic fork, Ø 38 mm
Front Wheel Travel	120 mm / 4.7 in
Rear Suspension	Aprilia progressive mono shock system, Sebach
Rear Wheel Travel	120 mm / 4.7 in
Front Brakes	Single Ø 320 mm floating disc, 4 piston caliper, Brembo
Rear Brakes	Single Ø 240mm disc, 2 piston caliper
Front Tyre	100/80-17
Rear Tyre	130/70-17
Seat Height	800 mm / 31.5 in
Wet Weight	131 kg / 289 lbs
Fuel Capacity	20 L / 5.3 US gal
Consumption Average	4.1 L/100 km / 24.4 km/l / 57 US mpg
Braking 60 km/h / 37 mph - 0	13.2 m / 43.1 ft
Braking 100 km/h / 62 mph - 0	37.6 m / 123 ft
Standing ¼ Mile	15.3 sec / 136.8 km/h / 85 mph
Top Speed	169.1 km/h / 103.3 mph
Colours	Blue/red/white

The chassis is an evolution from the AF1 Project 108: a beautiful diagonal twin spar frame of aluminum is much stiffer and lighter than the old frame of the AF1 Project 108. The front fork upside smaller - 38mm and completely new and is not adjustable. The rear swingarm made of steel and houses a progressive rear suspension (Sebach, not adjustable).

The brakes at the front is now a very beautiful floating 320mm disc (the first case among 125 cc) and with a caliper (Brembo), four pistons; at the rear is a 240mm disc with twin piston caliper, similar to the previous AF1. The beautiful new 17 "wheels, Pirelli tires host the new MT 79 respectively in sizes 100/80-17 front and 130/70-17 rear.

The wetyweight down to 131kg, compared with 134kg on AF1 Replica.

Engine

The engine is the new Rotax 123, designed from scratch and replaces its predecessor, the Rotax 127. Here are the key innovations compared to the engine mounted on AF1 Replica:

New aluminum cylinder barrel treated with Gilnisil (iron rod on AF1)
New head into two pieces to improve the cooling
Stroke increased by 0.5 mm (from 54 x 54 to 54 x 54,5
Compression dropped to 15:1 compression (from 15,5:1)
Balancer (absent on the Rotax 127)
Valves RAVE 2, neumatic
Carburetor Dell'Orto PHBH 28 RD oval section
Air Box with dynamic air intake mounted on the right side of the bike.

With the changes, the engine delivers maximum power to the rear wheel of 28.66ph at 10,500 rpm, slightly down from the Rotax 127 of the AF1 Replica (29.24 hp at 10250 rpm), but delivering substantially more low and medium revs.