This current project has been a most pleasurable bike to restore, as a keen RD enthusiast and owner of one of the later liquid cooled models.
The bike came to us as a relatively un-tampered, low mileage example although stripping of the engine did uncover the fact that at least the motor was very tired. So after a full crank rebuild, pistons, and numerous seals, bearings and gaskets along with repainting the outer covers and blasting the crank cases, it not only looked as new but would be mechanically sound too.
Special requirements for this age Yamaha, amongst others is the “Drab olive passivate” plating we had to replicate on various parts and fasteners. Most of the perished rubber and worn out parts are still available off the shelf from Yamaha and specialist dealers.