This project has been a most pleasurable bike to restore, especially for myself, a keen RD enthusiast and owner of one of the later liquid cooled models.
The bike came to us as an un-tampered example although stripping of the engine did reveal a tired motor. So after a full crank rebuild, pistons, re-bore and numerous seals, bearings and gaskets along with repainting the outer covers and blasting the crank cases, it not only looked like new but is mechanically sound too.
Particular requirements for this age Yamaha, amongst others is the “drab olive passivate” plating which 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.