AS/RD125 Series

Engine: 125cc two-stroke twins Weight: 98-115kg Top speed: 70-78mph Year: 1967-1981 Frenetic tiddlers that revel in being used hard. Basic engine design never really changed other than reed valve fitment in 1973. AS1 has marginal brakes, AS3 runs super-efficient TLS unit carried over to round-tanked RDs, later models use front disc. Like many Yamaha strokers tinware can be hard to find, so ideally avoid project examples missing large chunks. Engines well built but longevity of pistons is dependent upon regular checking and adjustment of point and ignition timing. They are tiny terrors and huge fun to ride.