1964 vintage Yamaha YA-6 injection system advertisement

Yamaha YA6 - This one's a real surprise package. Yamaha's rotary-valve design makes 125cc's feel and perform like a lot more. It's a great first choice for the super-lightweight beginner, but has the acceleration and handling to please the most experienced riders. $454 With Yamaha's injection system, 2-cycle lubrication is automatically controlled by engine RPM. The heart of the Injection System, an oil injector pump, automatically meters oil in precisely measured amounts into the fuel-air mixture between the carburetors and intake ports. Gas-oil ratio is controlled and varied according to crankshaft RPM. The engine gets exactly the right amount of lubricant at any given speed... 1963 Yamaha YA-6 Injection System Ad available at www.DadsVintageAds.com CLICK THE PICTURE TO "BUY IT NOW"