This comprehensive Aprilia ROTAX engine type 655 1995 Service Repair Manual provides detailed instructions and specifications for servicing and repairing your motorcycle engine. It is your go-to resource for all maintenance and repair needs, offering a complete guide for both experienced mechanics and DIY enthusiasts. The manual is structured to guide you through each procedure, from disassembly to reassembly, and covers a wide range of topics, including: * **Engine Identification:** Clearly identifies the specific components and features of the Aprilia ROTAX 655 engine. * **General Precautions:** Highlights safety measures and essential precautions to ensure a safe and successful repair process. * **Disassembly and Assembly:** Provides detailed step-by-step instructions for disassembling and reassembling the engine, ensuring proper procedures are followed. * **Maintenance Check List:** Offers a comprehensive checklist for regular maintenance, helping you stay on top of routine service intervals. * **Check and Maintenance:** Explains how to perform essential checks and maintenance tasks, including fluid levels, component inspections, and adjustments. * **Special Tools:** Outlines the specialized tools required for certain procedures, aiding in acquiring the necessary equipment. * **Engine Body:** Covers the repair and maintenance of the engine block, including crankshaft, pistons, connecting rods, and other internal components. * **Fuel System:** Details the fuel system's components and provides instructions for troubleshooting and repairing fuel delivery, injection, and related issues. * **Troubleshooting:** Offers a comprehensive troubleshooting guide to diagnose and resolve common engine problems. * **Servicing Specifications:** Provides precise specifications for various engine components, ensuring proper adjustments and tolerances. * **Tightening Torques:** Lists the correct tightening torques for all bolts and nuts, preventing over-tightening or loosening. * **Disassembling and Servicing:** Provides detailed instructions for disassembling and servicing specific engine sub-systems, such as the clutch, transmission, and alternator. * **Cooling System:** Covers the cooling system's components, including the radiator, water pump, and thermostat, with instructions for maintenance and repairs. * **Exhaust System:** Provides information on the exhaust system's components, maintenance, and repair procedures. * **Fuel Filter:** Explains how to inspect and replace the fuel filter. * **Electrical System:** Details the electrical system's components, including wiring diagrams for troubleshooting and repair. * **Alternator:** Provides instructions for inspecting, servicing, and troubleshooting alternator issues. * **Regulator:** Offers information on the voltage regulator, including how to test and replace it. * **Wiring Diagram:** Includes detailed wiring diagrams for the entire electrical system, simplifying troubleshooting and repair tasks. This comprehensive manual presents essential information for maintaining and repairing your Aprilia ROTAX 655 engine, ensuring you have the knowledge and resources to perform repairs efficiently and effectively.

The Aprilia Rotax 655 engine, famously used in the Aprilia Pegaso 650 motorcycle, was a remarkable powerplant that marked a significant leap forward in the mid-1990s. This liquid-cooled, 650cc, 90-degree V-twin engine was a testament to the ingenuity and technical prowess of Rotax, the Austrian engine manufacturer, whose engines found widespread use in motorcycles, snowmobiles, and even aircraft. The Rotax 655 was renowned for its smooth power delivery, thanks to its unique crankshaft design with a 360-degree firing order, resulting in a pulsating, but remarkably smooth and linear power delivery. It was also praised for its robust construction and reliability, making it a popular choice for both on and off-road adventures. The Rotax 655 wasn't just a powerful engine; it was a versatile one. The Pegaso 650, for example, was a versatile dual-sport motorcycle that could handle both off-road excursions and commuting duties, showcasing the engine's ability to excel in different environments. This versatility was further amplified by its relatively compact size and lightweight design, contributing to the Pegaso's agility and maneuverability. As a result, the Rotax 655 became a well-respected engine in the motorcycle industry, particularly with riders who appreciated its blend of power, reliability, and versatility. Despite being discontinued in 2001, the influence of the Rotax 655 continues to resonate, inspiring future generations of engine designs. Its legacy serves as a reminder of the lasting impact of Rotax's technical innovations and the enduring appeal of a powerful yet smooth and reliable engine.