Bultaco Fuel Mixture and Servicing?

[djs238]

Hi all,
I've just bought a 76 Bultaco 360 Pursang.

I'm not sure what fuel mix ratio to run?

I was also wondering about servicing. I've owned 4 strokes all my life (current ride KTM450EXC) and I'm not sure what oil to run and how often to change it? Its gearbox oil only right?

Thanks for any advice, much appreciated!
Dan.

[matcho mick]

gotta be safe with between 25,& 30 -1,(i use motul synthetic in the ossa),motul gearoil in the box,but you have a seperate primary chaincase,which generally runs a lighter viscosity then the gearbox,bully guys will kick in with best oils/amount to use shortly  ,cheers,