The R65 is essentially a reliable bike. I would be sure that you have done as much preparation on your bike at the beginning of the season and then ride with minimum spares.
Keep an eye on how it is running and don't set out with any nagging doubts. Then you can enjoy yourself without carrying 30lbs of spares. All of which you will not need.
Spend the winter season (if you have one) preparing your bike for the coming season - don't just let it gather dust in the garage and expect it to be just fine when the sun comes out next. If you at a mileage where a bit of preventative maintenance is in order then get it done and do not wait for the 'expected failure' especially if you bike has a lot of miles under its belt.
Don't set out on a bike with a questionable charging system, frayed cables, dodgy tyres and running rough. You are asking for trouble.
Keep spares to a good tool kit, bulbs, fuses, wire, duct tape etc. If you carry a spare tube, ensure you have the tools to change it and a pump to inflate it. Use the underseat storage. When it is full, your done.
Unless of course your trip is going to be longer that your service interval, both in mileage and time. Overland trips of multiple weeks and multiple 1000s of miles are another kettle of fish entirely.
Be prepared for local conditions, I am in blighty and have never ridden in the Austalian Outback so what do I know about riding there?
Best thing of all - get to know your bike - ride it often, and let it speak to you.
At least then you will have room to bring us home some presents.

Cheers