Spare carb diaphragm comes to mind. If your R100/7 has the flat top 32mm Bings, it's more feasible to carry a diaphragm and slide assembly, as it's a PITA to swap just the diaphragm, especially roadside. I had a 78 R100/7 with those carbs, and had a diaphragm fail on a coast to coast trip, and it turned into a real fiasco. Also, diaphragms fail without warning. Luckily, all other Airhead Bings are much simpler to change diaphragms on, even roadside. So hopefully your 77 has those type. I currently ride a 95 R100RT and first thing I did when I got it was to order a pair of diaphragms to carry on the bike as spares. 

My theory was to do the prep work in my shop where I had all the tools and could do the work with fans and lights vs. side of the road. When I ride, I like to ride.

► Points and condenser for sure. Auto Advance springs. [Or convert to a modern EI before leaving, which has the advance curve in software.]

► Consider that the carb diaphragms (and all the other "rubber" carb bits) fail because of the ethanol fuel. I'd much rather inspect and replace at home, because you'll need to upset the carb balance to do this work and you will not have your carb balancing equipment on your trip.

► Installing LED bulbs (especially headlamp and tail lamp) reduces system load and gives you MORE light at both ends. So the battery charges better/faster, and the rectifier board and alternator don't need to work as hard.

► If you run into battery issues the second cause might be the OEM Voltage Regulator, which is mechanical in nature and was outdated in 1990. It's time to think about a Solid State VR. (You haven't lived until you've had to roll off a /7 with a dying battery !!)

► On a /7... definitely replace the OEM Starter Relay before leaving. Just look on Amazon for a "Dual 87 Relay".

► And, of course, if you haven't converted your fuses to modern "flat pack" type, then you'll need to hunt up a pack of the strange 7A German pointy-end fuses, because you can't find them on the road.

Use this article as a check list. I know it talks about a bike in storage, but the failure points are all the same:

https://www.airheads.org/community/wrenching/new-owner-primer-tips-to-get-your-airhead-back-on-the-road/

Hope this helps.

@joe-hall Hi Joe, thank you, good advice.  I will add these to my list.

Rich...

@wobbly 

Hi Richard, very good article.  I now have a good list of items to carry and some new maintenance items to perform.

THanks!

Rich...

I usually carry inner tubes, and I always have a spare alternator rotor and the tools to change one out.

Just kinda a funny story on this topic. In 1997 I rode my ‘78 to Alaska and the Arctic Circle. In preparation for this epic adventure, I packed the most clever array of spare parts and pieces, and hardware and sundry supplies. The funny part is, … all that clever stuff is still packed, … and somewhere in my garage. I never needed one item in 1997, nor have I in the 26 years since.

The bike gets careful maintenance, and replacement parts as needed, at home. On the road, it’s been nothing but gas and occasionally some motor oil. 

Posted by: @17281

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@wobbly   Hi Richard, very good article.  I now have a good list of items to carry and some new maintenance items to perform.

Thanks!

• You can barely see them, but 3 links were given in my post: starter relay, LED HL bulb, and replacement VR.

• /7 starter relays are now under $5 !! The relay usually needs some attention because the /7 brake master cyl leaks caustic brake fluid right onto the most important relay and harness connections on the entire motorcycle. If you ride a /7, then don't leave home without applying a anti-oxidation compound (such as No-Ox-Id) to those 5 relay connections.

Hope this helps.