Model History

The YDS7 differed greatly from it's YDS6 predecessor.
One of the most important changes was the use of horizontally split crankcases. These had already been used by the 350cc YR series since its introduction in 1967. The position of the final drive chain also changed from the right to the left side. This was due to the re-introduction of the pushrod clutch release mechanism. Also, the over complex gear selection mechanism was done away with to be replaced by a rotating drum mechanism that was similar to the ones already in use on the YR range of bikes. A complete new set of gearbox ratios was also used. The frame was redsigned with particular attention paid to the rear sub-frame and the gusseting around this area. The styling was also heavily altered with the engine cases being painted satin black with two horizontal stipes on either side being polished. The barrels and heads were also painted black and the sides of the heads and the edges of the fins were polished. The styling was common to most Yamaha's (AS3, CS5, DS7 and YR5)at this time and the range was known as the Europa range.

The YR5 was cosmetically identical to the YDS7, the only difference being engine parts such as the barrels, pistons, heads, a different primary drive ratio and a revised oil pump.