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Yamaha 125 AS1 and 125 AS2


Back in 1960’ s 125cc engine motorcycles were used as utility vehicles, but as technology advanced, they became more and more popular as sport and touring bikes. If you were a teenager back in those days, the YAS1 could have easily been a motorcycle of your dreams.


Yamaha YAS1

Introduced in 1967 in Japan, Yamaha AS1 defied all motorcycle logic with its miniaturisation and simplicity. Yamaha 125 AS1 was lightweight and relatively cheap with many parts identical to the Yamaha FS1 moped. The basic tubular frame carried 125cc two stroke twin air cooled engine. Both 125 AS1 & 125 AS2 had cast iron twin cylinders, single shoe drum brakes at front and rear, chain transmission, enclosed suspension at front and rear and chromed tank panels. The sports bike look was finished off with twin chrome exhausts. It came in two colours only Red or Blue.

1970 Yamaha AS2 / YAS2 was an aesthetic evolution of YAS1 with different tachometer, double cam and larger fuel tank

1971 Yamaha AS3 / YAS3 received a major upgrade. It was larger, heavier and much chunkier version of the old YAS1. The engine was housed in a new frame, it got new set of front forks, aluminium cylinder and other new features.

The popularity of Yamaha AS3 125, especially in France and continental Europe, was so immense,  that Yamaha made special edition bike, the Yamaha YAS3 Europa with wide large capacity 11.5l fuel tank and even optional full race kits for all YAS models. With the reed intake valves introduced in 1973 the era of YAS Pocket Rocket ended followed by the next generation Yamaha RD125 (Yamaha RD AS3).


Yamaha YAS1 Parts

As Yamaha models evolved so did parts, some are still being used nowadays and are available from Yamaha dealers directly, some were made obsolete. We offer a quality reproductions of some of the most desired Yamaha YAS1 parts & Yamaha YAS2 spares on the market.

Due to popularity and slight difference between earlier models and the 1971 Yamaha AS3, we made a special category just for this model alone! If you can’t find a specific part on our website to fit your YAS restoration project or you need a parts list, please email us.


Here are also some handy links:

YAS1 125 road test article at Classic Motorbikes

Dedicated Yamaha YAS and RDX Forum in France  

Inspirational video of finished 1973 Yamaha AS3 Restoration Project