renago

Instead of sheet metal for covering , consider HDP , high density plastic . A little lighter then metal , but you don’t transmit cold or heat ,and much more gentile to the touch . And non need to paint ever. They come in many finish and colors

How many kg is that steel frame ?

When I had HZ1 turbo at that speed was running 700-750. Now with HD-T , 570. Flat road , 255/85/16 tires . Medium load Need to adjust IP .

It’s the oil seal from gearbox . You must take down the gearbox , change 15€ of seal , and all goes well .

I have a 78 and it came stock with 2 tanks . 90 l in front and 90 L in the back . As I needed more range , I duped the rear tank in favor to a custom made tank of 200 L . This is not an answer to your initial question, but don’t look only to the...