Yamaha 125 AS1 & AS2 History & Parts

Yamaha 125 AS1 & AS2 History & Parts

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

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 YAS1 & YAS2 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 YAS 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:

Yamaha YAS1 road test article at Classic Motorbikes

Dedicated Yamaha YAS and RDX Forum in France  

Inspirational video of finished 1973 Yamaha AS3 RestorationProject

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122-27413-00 Footrest Cover

Quality replacement footrest rubber for Yamaha motorcycles. Two are required to refresh the look of ..

€7.20 Ex Tax: €7.20

132-18113-01 Gear Lever Rubber Cover

Quality shift pedal rubber / gear lever cover for Yamaha motorcycles.Length: 40mmInternal Diameter:..

€2.65 Ex Tax: €2.65

156-15618-01 Kickstart Lever Cover

Quality rubber kickstart lever cover replacement for Yamaha motorcycles. Length: 65mm Internal diam..

€2.70 Ex Tax: €2.70

156-27413-00 Front Footrest Cover

Quality replacement front footrest rubber for Yamaha motorcycles. Two are required to refresh the lo..

€12.00 Ex Tax: €12.00

164-23462-00 Steering Dust Seal

Quality rubber replacement steering dust seal / steering head bearing for Yamaha motorcycles and sco..

€2.45 Ex Tax: €2.45

183-11512-00 AS3 RD125 Crankshaft Seal

Quality rubber replacement crankshaft o-ring seal for Yamaha motorcycles. Two are required per motor..

€14.50 Ex Tax: €14.50

29L-82131-00 Battery Band

Quality rubber replacement battery band/strap for Yamaha motorcycles. It includes steel plated rings..

€7.10 Ex Tax: €7.10

307-23114-00 Front Fork Gasket

Quality rubber replacement front fork o-ring seal / rubber gasket for Yamaha motorcycles. Two are re..

€3.10 Ex Tax: €3.10

583-15371-00 Crankcase Breather

Quality white plastic crankcase breather / nozzle for Yamaha motorcycles.This plastic elbow fits to ..

€3.40 Ex Tax: €3.40

Bleed Nipple Cap

Quality replacement black rubber bleed nipple cover / grease nipple cap for Yamaha motorcycles. ..

€1.50 Ex Tax: €1.50

122-24181-00 Fuel Tank / Mudguard Damper

Quality rubber replacement damper for a fuel tank or mudguard for Yamaha motorcycles.Two are require..

€2.40 Ex Tax: €2.40

126-13116-00 Oil Pump Mounting Gasket

Replacement oil pump mounting gasket / pump case gasket from quality gasket paper for Yamaha mo..

€2.00 Ex Tax: €2.00

137-15353-00 Oil Tank Drain Cap Gasket

Replacement oil tank drain cap gasket from quality gasket paper for Yamaha motorcycles.Outer di..

€3.55 Ex Tax: €3.55

168-82542-10 Reverse Switch Assembly Cap

Quality rubber replacement neutral wire rubber boot / reverse switch assembly cap (for reverse switc..

€5.25 Ex Tax: €5.25

174-24741-00 Seat Pad

Quality rubber replacement seat pad / rubber damper for Yamaha motorcycles. It is fitted to the..

€2.90 Ex Tax: €2.90