This comprehensive engine workshop manual covers Aprilia 3AS and 4AS models produced between 2004 and 2006. It provides detailed instructions and technical specifications for servicing and repairing your motorcycle's engine, ensuring you have the information needed for proper maintenance and troubleshooting. The manual includes sections detailing:

* **Important Information:** Begins with essential information regarding safety precautions, tools required, and general guidelines for working on the engine.
* **Technical Data:** Offers detailed technical specifications for the engine, including dimensions, tolerances, and other crucial technical parameters.
* **Removal Of The Engine:** Provides step-by-step instructions for safely removing the engine from the motorcycle frame, along with necessary precautions and tips.
* **Engine Disassembly:** Guides you through the process of dismantling the engine, highlighting critical components, their functions, and proper disassembly techniques.
* **Inspection and Diagnosis:** Offers insights into inspecting engine components for signs of wear, damage, or malfunction, providing guidance on troubleshooting common engine issues.
* **Reassembly and Adjustment:** Provides detailed instructions for reassembling the engine, ensuring proper component alignment, torque specifications, and adjustments for optimal performance.
* **Engine Tuning and Performance:** Covers essential aspects of engine tuning, including adjusting valve clearances, timing, and other parameters to optimize engine performance.
* **Troubleshooting and Repair:** Includes comprehensive information on diagnosing and repairing common engine problems, offering step-by-step guides for addressing specific issues.

This manual is an invaluable resource for both professional mechanics and DIY enthusiasts, equipping you with the knowledge and confidence to service and repair your Aprilia 3AS or 4AS engine effectively.

The Aprilia 3AS and 4AS models, produced between 2004 and 2006, represent a significant chapter in the Italian manufacturer's history, ushering in a new era of performance and style in the mid-displacement sportbike segment. These machines were powered by a potent liquid-cooled, 4-stroke, 60-degree V-twin engine displacing 499cc. This powerplant, renowned for its smooth and linear power delivery, was capable of producing a respectable amount of horsepower for its class, making it a thrilling ride both on the open road and on the track. The 3AS and 4AS shared a similar design language, incorporating sharp, angular lines and a low-slung profile that exuded a sense of aggression. These bikes were designed with a focus on handling agility and rider comfort, featuring a telescopic front fork and a rear monoshock suspension system. Stopping power was provided by a powerful dual-disc front brake setup and a single-disc rear brake.

Beyond their performance capabilities, the 3AS and 4AS models offered a level of sophistication and features that set them apart from the competition. The 3AS in particular was a truly unique machine, featuring a distinctive trellis frame construction and a distinctive single-sided swingarm. These motorcycles were also known for their exceptional build quality, using premium materials and components throughout. The Aprilia 3AS and 4AS, despite their relatively short production run, carved a niche for themselves in the marketplace as highly capable and desirable sportbikes. These machines continue to be coveted by enthusiasts today, appreciated for their combination of performance, style, and Italian craftsmanship. For those seeking the thrill of a true Italian performance motorcycle, the 3AS and 4AS offer a compelling and rewarding experience, both on the road and on the track.