Introduction

Model Description

The model "Aprilia - SR 50 (AC, 1998, ZD4LY)" is a sporty scooter produced by the Italian manufacturer Aprilia in 1998. It belongs to the SR 50 series, known for its dynamic design and performance-oriented layout.
The SR series was developed to offer riders in urban environments an agile and stylish mobility solution, with a focus on a sporty riding experience.
The SR 50 (AC, 1998) represents an early phase of this model series and targets riders operating a 50cc vehicle in the AM license class or comparable categories.

History of the SR 50 Series

The SR 50 series was first introduced in 1992 and marked a turning point in the 50cc scooter segment with its advanced technology and sporty appearance.
The SR 50 (AC, 1998, ZD4LY) belongs to the first generation of this series, which was produced until the late 1990s.
Compared to later models like the SR 50 DiTech or the water-cooled variants from 1994 onwards, this version is simpler, with an air-cooled engine.
Aprilia positioned the SR 50 in competition with models from other manufacturers like Yamaha or Piaggio, relying on a design inspired by larger motorcycles.
Production in 1998 falls into a period when Aprilia was further establishing its reputation as an innovative manufacturer in the scooter and motorcycle market, shortly before the brand was acquired by the Piaggio Group at the end of 2004.

Technical Details

Engine and Performance

Technically, the Aprilia SR 50 (AC, 1998, ZD4LY) is powered by a single-cylinder two-stroke engine with a displacement of 49cc.
This engine is air-cooled (AC stands for "Air Cooled") and is fueled by a carburetor, allowing for straightforward maintenance and direct power delivery.
The output is about 3 kW (4.1 hp), permitting a top speed of approximately 45 km/h (restricted, depending on legal requirements).
The vehicle is equipped with a continuously variable transmission (CVT), ensuring easy operation and smooth power transfer.

Chassis and Brakes

The chassis consists of a hydraulic telescopic fork at the front and a single shock absorber at the rear, providing the scooter with solid stability and sporty handling.
The braking system includes a 190 mm diameter disc brake at the front axle and a 110 mm drum brake at the rear, which was advanced equipment in the 50cc segment at the time.
With a dry weight of about 90 kg and a wheelbase of around 1,275 mm, the SR 50 is light and agile, ideal for city traffic.
The tires, measuring 130/60-13 both front and rear, emphasize the sporty character and offer sufficient grip.

Design and Variants

Color Variants

The Aprilia SR 50 (AC, 1998, ZD4LY) was available in various color variants, which could differ depending on the market.
Known paint finishes include "Rosso" (Red), "Nero" (Black), and "Grigio" (Gray), which emphasized the sporty design and gave the scooter a distinctive appearance.

Special Models

There are no clear indications that official special models were produced for this specific year.
While later SR 50 variants like the "Racing" or "Stealth" editions are known as special models, the focus for the 1998 model was on a uniform series production.
However, local markets or dealers might have offered individual customizations that were not classified as official special models.