Introduction

Aprilia SR 50 Di-Tech Sport (2002, ZD4RLE)

The Aprilia SR 50 Di-Tech Sport is a sporty scooter produced by the Italian manufacturer Aprilia in 2002. It belongs to the SR 50 series, known since 1992 for its innovative technology and dynamic design.
The SR 50 Di-Tech Sport was developed to offer riders in the 50cc class a powerful option with advanced technology, particularly through the introduction of direct injection.
This model is primarily aimed at riders seeking a nimble vehicle with a sporty character that can be ridden in many countries with a moped or AM license.

History of the SR 50 Series

The SR 50 series was first introduced in 1992 and set early standards in the sporty scooter segment.
The SR 50 Di-Tech Sport (2002, ZD4RLE) is part of the second generation of this model family, which experienced significant advancement from 1999 with the introduction of Di-Tech technology (Direct Injection Technology).
This technology, developed in collaboration with Orbital, was first introduced in the SR 50 Di-Tech in 1999 and marked the beginning of direct injection in 50cc scooters.
The ZD4RLE from 2002 is a special "Sport" variant of this concept, distinguished from standard models by its emphasized sporty design and elements.
During this phase, Aprilia solidified its reputation as an innovator in the scooter market and successfully competed with brands like Yamaha and Piaggio.

Technical Details

Technically, the Aprilia SR 50 Di-Tech Sport (2002, ZD4RLE) is powered by a single-cylinder two-stroke engine with a displacement of 49cc.
The engine is liquid-cooled and uses a direct injection system that injects fuel directly into the combustion chamber, allowing for more efficient combustion and lower consumption compared to traditional carburetors.
The power output is about 4 kW (5.4 hp) at 7,000 rpm, and the top speed is limited to about 45 km/h, with derestricted versions capable of reaching higher speeds depending on the approval.
The vehicle is equipped with a continuously variable transmission (CVT), ensuring easy operation.

Chassis and Brakes

The chassis consists of a hydraulic telescopic fork at the front and a single shock absorber at the rear, giving the scooter a sporty road stance.
The braking system includes a 190 mm diameter disc brake at the front and a 110 mm drum brake at the rear, providing solid braking performance for its class at the time.
With a dry weight of about 95 kg and a wheelbase of 1,275 mm, the SR 50 Di-Tech Sport offers high maneuverability.
The tires, measuring 130/60-13 at both front and rear, emphasize the sporty claim and ensure sufficient grip.

Design and Variants

The Aprilia SR 50 Di-Tech Sport (2002, ZD4RLE) was available in several color variants, which could vary depending on the market.
Common paint options included "Rosso" (Red), "Nero" (Black), and "Grigio" (Gray), often combined with sporty graphics that enhanced the dynamic look.
There are no clear indications that the ZD4RLE itself is considered a standalone special model, as the "Sport" designation already represents a special variant of the Di-Tech.
However, the SR series was known for offering limited editions like the "Racing" or "Replica" models, often featuring special paint and decals.
The focus of the ZD4RLE was on a standard sport version, with individual customizations possible through dealers.