Yamaha motor specs appear on the official website for Yamaha. Each product is located under the appropriate category page, and each product page has a specifications section, including the engine.
The engine specifications given by Yamaha include the engine type, the bore x stroke, the compression ratio, the fuel delivery, ignition type, transmission and the final drive. In addition, each model page has information on the chassis and the product's dimensions. Each page also explains the top features of the particular model, including analytical information on the engine, the electronics and systems, the chassis and suspension and any additional features.