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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 Yamaha YAS1 could have easily been a motorcycle of your dreams.


Yamaha YAS1 Model

Introduced in 1967 in Japan, Yamaha YAS1 defied all motorcycle logic with its miniaturisation and simplicity. Yamaha 125 AS1 was lightweight and relatively cheap with many components identical to the Yamaha FS1 moped. The basic tubular frame carried 125cc two stroke twin air cooled engine. Both 1968 Yamaha YAS1 & YAS2 motorcycle 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 bike with different tachometer, double cam and a larger fuel tank


1971 Yamaha AS3 / YAS3 motorcycle received a major upgrade. It was a larger, heavier and much chunkier version of the classic YAS1. The engine was housed in an improved frame, it got upgraded set of front forks, aluminium cylinder and other back then revolutionary 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 year 1973 the era of YAS Pocket Rocket ended followed by the next generation Yamaha RD125 (Yamaha RD AS3).


Yamaha YAS Parts

As Yamaha models evolved so did the bike parts.  Some spares are just not economical for Yamaha to produce anymore, so we have decided to stock some high quality reproductions as well as OEM originals. There aren't many on our collections just yet, but we are adding new ones on regular basis and commissioning exclusive components as well.


We understand that especially rubber footrests and seals disintegrate over time. We now stock some of the essential items required for your Yamaha YAS bike project.

Stand, Footrest & Brake Pedal – If exposed to element, old footrest rubbers crack, we therefore stock front & rear footrest rubbers, gear lever as well as kickstart rubber. 


Engine – If you need to rebuild your engine, you will probably need replacement crankshaft seals, which have not been available from Yamaha now for decades. Add paper gaskets or breather and your restoration is set for success.


Oil Pump & Tank – Rebuilding an old oil pump is certainly easier than finding a replacement one on the market. Through we don’t supply hardware for it, we have a full kit of seals and gasket to help you restore your classic Yamaha lube oil pump in no time. 


There are other rubber items in our collection, from cush drive rubbers, fuel tank dampers, seat pads, battery bands and straps, exhaust gaskets to bolts and washers. Many of these parts have been discontinued for decades! 


Due to popularity and slight difference between earlier YAS two stroke bikes and the 1971 Yamaha AS3, we made a special category for each major development stage of YAS motorcycles! 


If you search for a specific part on our website to fit your restoration project and can't find it, 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