Top 5 things to do to improve a 20 year old R100GS:
Get the carbs tuned by an expert.
Get new throttle, clutch and choke cables.
Get the forks refurbished.
Fit a Hawker Odyssey battery.
New tyres - TKC80 if riding on dirt, Tourance if not.
The rear shock might also need replacing. You'll be tempted by Ohlins, but i've not been that impressed.
Most likely failures:
Starter motor (the original ones were rubbish, but the latest BMW stock replacements are fine, no need for an expensive alternative).
Drive shaft - they wear out in as little as 30,000 miles.
Gear box - get the oil serviced religiously. They fail. They cost lots.
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