Garelli 40 SK
 Garelli 40 SK (1978) | |
| Manufacturer | Garelli |
|---|---|
| Production | 1974–1979 |
| Class | Moped |
| Engine | 49cc air-cooled two-stroke single-cylinder |
| Bore / stroke | 40 mm × 39 mm |
| Compression ratio | 11:1 |
| Top speed | ~40 km/h |
| Power | 2.9 hp @ 6000 rpm |
| Ignition type | Ducati magneto (6 V, 20 W) |
| Transmission | 4-speed manual, chain drive |
| Frame type | Tubular double-cradle frame (painted silver metallic) |
| Suspension | Telescopic trapezoidal front fork, twin-shock rear swingarm |
| Brakes | Drum brakes (front: hand-operated, rear: foot-operated) |
| Tires | 3.50 × 10 in |
| Fuel consumption | ~2 L/100 km |
The Garelli 40 SK was a compact moped manufactured by Italian company Garelli Motorcycles between 1974 and 1979. It was a successor to the Garelli Mini-Mokick and Bonanza models, updated in terms of both engineering and styling. The "SK" version introduced numerous improvements and technical changes over earlier variants.
Overview
The 40 SK was designed as a practical and sporty moped for younger riders. It featured a 49cc two-stroke single-cylinder engine with a Dell’Orto SHA 14/14 carburetor and cold start automatic. The engine produced 2.9 hp at 6000 rpm and had a 4-speed foot-operated manual transmission with a total gear ratio of 1:10.73. The cylinder and head were made from aluminum, with a hard-chromed cylinder bore. The side covers were painted black, and the exhaust was also finished in black with a heat shield.
The ignition and lighting system was provided by Ducati, using a 6 V magneto setup.
Chassis and equipment
One of the most notable changes was the newly developed trapezoidal front fork. Unlike traditional forks, it used separate upper and lower tubes with a bridge mount, which unfortunately led to problems over time: rubber seals could wear out, allowing water to enter and cause internal rust.
The frame was redesigned and finished in silver metallic paint, and the former side stand was replaced by a more stable center stand. The rear light was now mounted directly on the frame rather than the fender, and the updated lighting system included a brake light, which had become a regulatory requirement. Some later models were also equipped with turn signals.
Wheels and comfort
The Garelli 40 SK was equipped with cast aluminum "mag wheels" by Grimeca instead of traditional steel rims. The 3.50 × 10-inch tires featured knobby tread, allowing for light off-road use. The two-person seat was more generously padded than in previous models, offering greater comfort.
Technical specifications
| Specification | Value |
|---|---|
| Engine | 49cc air-cooled 2-stroke single |
| Bore × stroke | 40 mm × 39 mm |
| Power | 2.9 hp @ 6000 rpm |
| Compression | 11:1 |
| Ignition | Ducati magneto 6 V / 20 W |
| Carburetor | Dell’Orto SHA 14/14 (jet size 56) |
| Clutch | Multi-disc in oil bath |
| Transmission | 4-speed foot-operated |
| Final drive | Chain 1/2" × 3/16" |
| Frame | Tubular double-cradle steel frame |
| Front suspension | Trapezoidal fork |
| Rear suspension | Swingarm with twin shock absorbers |
| Wheels | 3.50 × 10 in |
| Brakes | Drum (front hand-operated, rear foot-operated) |
| Gear ratios | 1st: 2.79 · 2nd: 1.65 · 3rd: 1.21 · 4th: 1.04 |
| Overall gear ratio | 1:10.73 |
| Wheelbase | 1030 mm |
| Dimensions (L × W × H) | 1490 mm × 750 mm × 1050 mm |
| Fuel consumption | ~2 L/100 km |
| Top speed | ~40 km/h |
Sources
- S. Ewald, G. Murrer: Enzyklopädie des Motorrads. Novara 1996, deutsche Auflage im Weltbild Verlag 1999, ISBN 3-86047-142-2, S. 11–15.
- Daniele Agrati, Roberto Patrignani: Agrati Garelli – 80 anni di storia (1999), S. 125–126, ISBN 88-7911-203-1.
- Technical data sheet (private collection, 1970s original)
- Myrons Mopeds
- Wikimedia Commons – Garelli 40 SK
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