On trips a long way from home spares for older bikes can present a problem. My last big trip I took a spare bean can ignition trigger, a voltage regular and an ecu. All second hand parts that I bought cheap on ebay. They all fit under the tank and now live there permanently and
take up no luggage space 
really. I happened to have an alternator rotor and stator in the garage which I packed up and left with a friend who could post it on if required. I would've taken a spare diode board but found the one in my shed was faulty. Just fitted new coil so trusted it. Why bother with all that lot? Well, I've had a couple of trips spoiled before for lack of a simple part, even when stuck in a city. If you're in the middle of nowhere maybe don't speak the local language, on your own, could take a while to get mobile again :-/.
A mate suggested I shouldn't bother about spares just rely on breakdown recovery. I do have breakdown recovery, but its last resort and I don't want to spend my holidays travelling in a breakdown truck.
Also, I take a length of wire, duct tape, the usual bulbs, fuses, inner tube, puncture outfit. Some device to help get the tyre off the rim (small G cramp and piece of wood) No good at all having a puncture outfit if the **** tyre won't come off the rim. Spare clutch cable runs alongside original. Spare throttle cable. Epoxy glue, super glue (good for fixing torn carb diaphragms etc), length of stainless wire. Spare spark plug and HT lead.
Importantly, tools that have actually been used on the bike so I know they'll do the job.
All this fits in the two underseat bins and I even found space for a couple of relays. Slightly longer than standard tyre levers are stored up the frame tube instead of the cable lock.
Of course I fully understand that sods law dictates when a breakdown occurs it will involve some component I'm not carrying a spare for

. I can only hope there'll be another R65 pilot passing by soon, who'll have the needed part stored underneath his seat.