Is there anywhere I can download or get a manual of the Ossa Mar?

There is one out there, try CustGP website.

http://www.vitalemaquinas.com/manuales-despieces.html

 

Loads of stuff on here.

I have a manual by Clymer its for the MAR and older but I find useful even for my gripper as the engine is very not much different. I don't know if they are still available to buy, I think I have had it since 1982.

 

Steve.

There's also the Sammy Miller photocopy of the original factory manual, I've got one, its ok if you have a very early bike, but the Clymer one is probably a better bet if you can get hold of them.

Exploded parts diagrams are available on the net which are pretty usefull.