These detail pictures were taken from the first production model in the Netherlands after the first roadtest was finished in 1967.
You can use this also very well for all Yamaha 250/350 cc models of that period 1965-1969, the YDS3, YDS5E, YM1/YM2, DS6 and R2/R3, as the basic body construction details were very similar.
The ¾ front view shows also the small metal clips, holding the exhaust nuts in position. The ring nuts were nicely chromed.
The right hand side engine shot shows the solid-type carburettor bands with the screw down at the front and the screws up at the back. Note the position of the “Autolube” sticker too.
On the left there is another “Autolube” sticker.
Left ¾ view front illustrates the previous picture.
The machine was quite a “heavyweight”, but very good looking. Observe the chrome lifting handle under the seat.
Front wheel, brake, mudguard and front fork as all Yamaha’s from that period.
Handlebar layout with YDS3/5 type speedometer, but with scale up to 180 km/h, tachometer up to 10.000 rpm, red line at 7.500 rpm.
The typical “shot-gun” style exhaust system and Dunlop K70 pattern rear tyre.
Rear shock absorbers are the same as on all these 250/350 cc bikes. Many bolts were chromed and not galvanised as later!
A very good picture where you can see the routing of the wires to the voltage regulator and the air filter-box and air filter cartridge.
The front wheel is the Yamaha standard, on the YR1 the levers were still solid chrome plated castings, later these became simple pressings (DS6, etc.). Do not forget to fit/make the return spring behind the front brake lever.
Handlebar layout from the right this time, The YR1 had done just 686 km, so the pictures were taken after the first test.
The YR1 looked much sturdier than the 250 cc machines, from all angles.
The clutch inspection cover is taken off. The Autolube pump, nylon tubing to the cylinders and rubber tube to the oil tank and the clutch “worm” should be positioned like this.
Must be difficult to find, an original Furukawa battery as Yamaha fitted to many models in those years. Again look how the wires “run”.
Fortunately there is also a good picture of the ignition, showing very clearly the position of all the components.