The Gp760 should have an separate oil tank as it runs oil injection. You
should be able to see an oil cap inside the ski where you fill it up. On
the gp800 it is near the front of the engine bay just under the handle
bars. You should be able to see it when you take the seat off.
You can fill it with an TCW3 two stroke oil, it must be TCW3 rated,
normal motorcylce two stroke oil won't cut it. I prefer to use shell
nautilus over the yamaha TCW3 oil as it burns cleaner.
It is also possible that the oil injection has been removed. If they
have done this they might have taken the oil tank and pump out. This
means you will have to premix your fuel. A mix of 50 parts fuel (normal
unleaded) to 1 part oil (50:1 ratio) will be fine.
>> Stay informed about: Newbie question: Fuel and Oil