Introduction

General Information

The model "Aprilia - SR 150 (1999-2001, ZD4PX)" is a sporty scooter produced by the Italian manufacturer Aprilia between 1999 and 2001.
It belongs to the SR series, known for its dynamic appearance and performance-oriented design.
The SR models were developed to combine driving pleasure with practical everyday usability, targeting riders seeking an agile scooter with a sporty character.
The SR 150 is positioned in the upper segment of the SR line of that time and stands out with its more powerful engine compared to smaller variants like the SR 50.

Development and Market Position

The SR series was introduced in the 1990s, with the SR 150 (1999-2001) considered part of the second generation.
Aprilia had already achieved initial success in the scooter market in the mid-1990s with models like the SR 50, which impressed with their sporty appearance and technology.
The SR 150 was launched at the end of the decade, marking a step towards larger displacements within the series, which was originally focused on 50cc models.
During this phase, Aprilia increasingly collaborated with external engine manufacturers like Rotax to integrate powerful and reliable engines.
The production period from 1999 to 2001 falls into an era when Aprilia expanded its market position in the scooter and motorcycle segment, before the company faced financial difficulties in 2000 and was later acquired by Piaggio.

Technical Details

Engine and Performance

Technically, the Aprilia SR 150 is powered by a single-cylinder two-stroke engine with a displacement of 150cc.
This engine is liquid-cooled and delivers an output of about 11.5 kW (15.6 hp) at 8,500 rpm, allowing for good acceleration and a top speed of over 100 km/h for a scooter of this class, depending on the gearing and legal regulations.
Power is transmitted via a continuously variable CVT transmission, ensuring easy operation and direct power delivery.

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 sporty driving stability and adequate comfort.
The braking system includes a 220 mm diameter disc brake at the front axle and a 140 mm drum brake at the rear, ensuring reliable deceleration.
With a dry weight of about 115 kg and a wheelbase of around 1,290 mm, the SR 150 is agile and suitable for urban use as well as shorter overland trips.
The tires, sized 130/60-13 at the front and rear, emphasize the sporty claim and ensure good grip.

Design and Variants

Color Variants

The Aprilia SR 150 was available in several color variants, which could vary depending on the market and production year.
Common paint finishes include "Rosso" (Red), "Nero" (Black), and "Grigio" (Gray), which emphasized the scooter's dynamic look.
There are no clear indications that Aprilia released special models or limited editions for the SR 150.
Production focused on a uniform series version aimed at performance and a broad customer base, with individual customizations possibly offered by dealers or in regional markets, without being considered official special models.