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Factory official release picture of gray and black Yamaha SR400 motorcycle

SR400 and SR500 History and Development

Yamaha SR motorcycles were the simplest motorcycles made by Yamaha. Both Yamaha SR400 and Yamaha SR500 were very popular amongst commuters because of their slim structure, which was ideal for congested roads of large cities, but more importantly they were reliable,  easy to fix and easy to modify.

The original models introduced in 1978 had air cooled single cylinder 4 stroke engine, single camshaft, single valve on inlet and on exhaust, single carburettor and manual kickstart only. They were in fact street versions of XT500, designed to carry two people in a standard riding posture.

Yamaha SR400 Japan

SR400 motorcycle was first introduced in 1978 in Japan and for many decades it was exclusively marketed on the Japanese market only. Yamaha was trying to target the young entry level riders as well as daily commuters in the fast growing cities. The newer version was introduced to Europe, USA and other countries in 2014.

Yamaha SR for Export

SR 500 model was intended for export, mainly for Oceania, Asia and Europe. When Yamaha SR 500 2J4 reached Germany in 1978 it became so popular, that German motorcycle magazine The Motorrad awarder Yamaha 500cc SR the “Moto of the Year” for two years in a row. Production of this model continued for over two decades until it was stopped in 1999.

New Generation SR400 Yamaha

The new generation of 400cc SR immediately took over. Looking very much the same as the old classic one, it had only few modern tweaks.

The frame remained the same, but engine received electronic fuel injection, the wheel front received a hydraulic disc brake upgrade, while rear wheel kept the original drum brakes. There was now a sight glass into the engine which eased the old fashion lever kick start and the ride itself was improved with several new rubber mounts and engine dampers. New catalyser was also added in 2010 to meet the growing ecological demands. Regardless of all the changes, the old style “Thumper” engine character remained unchanged.

Spare Parts for Yamaha SR

Whether you have the original Yamaha SR400 street bike or Yamaha SR500 street tracker, sooner or later you might require some spare parts. For the newer models, you might still be able to get some OEM spares, but for all other older or custom motorcycles such as café racer, bobber, scrambler and others, you might want to check our section below.

We constantly add new SR400 & SR500 parts to our stock, so even though there are only few today, there might be many more in few weeks’ time. If you are looking for a particular part for any of these classic bikes that we don't stock yet, please email us.

For more information about the history of Yamaha SR400 and Yamaha SR500 motorcycle visit this article at

To identify the exact SR model  go to KEDO Australia