Inspired by genius

Ever heard the expression ‘Small is beautiful’? It could have been created for the all new YZF-R125, the exciting new member of the R-series family and the most advanced 125 production supersport machine that Yamaha has ever built.This radical, high-revving, fuel-injected 125 is the work of the same engineers who created our legendary YZF-R1 and YZF-R6 supersport bikes. And, as you’d expect, the YZF-R125 is packed with advanced MotoGP technology as well as a whole range of R-series type engine and chassis features. Its liquid-cooled, 4-stroke, 4-valve, single cylinder, SOHC engine is tuned to deliver free-revving performance right through to maximum power at 9000rpm – and for instant response and efficient operation this remarkable 6-speed 125 is equipped with a compact fuel injection system.

The YZF-R125 is targeted at the discerning buyer who demands best-in-class engine and handling performance as well as winning R-series style. In the engine department, the new R125 benefits from a 4-valve cylinder head that delivers high levels of intake and exhaust efficiency for ultra-responsive performance.For instant throttle response, this new high-tech 125 features a compact fuel injection system fed by a large-capacity airbox which, combined with the two inlet valves, delivers optimum intake efficiency together with excellent throttle response across the rev range.

Featuring bore and stroke dimensions of 52mm x 58.6mm, the compact short-stroke engine has a free-revving character that delivers strong acceleration. This short stroke layout – combined with the performance-boosting qualities of the 4-valve head, fuel injection system and free-flowing exhaust – gives the R125 the strongest overall performance in the 125 4-stroke class.

To optimise the class-leading performance characteristics of its all-new high-tech 125cc liquid-cooled engine, the R125 is equipped with a 6-speed transmission which keeps the engine on the boil and ensures a competitive top speed.