Murdo, I hope you’re doing well. Is there somewhere I could find information about how to properly make/install the blanking plate you mentioned, once the oil pump is removed? Also, I’ve had the bike out a for a few little rides (the days when it’s not snowing) and it’s been really interesting and fun relative to the modern larger bikes I’m used to. All the best, Jon
This is what they look like. This is for a later model than yours, but knowing how Yamaha didn't change things much it may fit. To make your own is no big problem, a flat plate and a gasket to seal it. https://www.economycycle.com/shop/y...maha-rd350400250oil-pump-block-off-plate-kit/