A lot harder to answer than 'what's the most unreliable' ...
In terms of what have I had to do least to to keep it going I suppose it would have to be the 1800 Gold Wing I have in the US. From memory the sum total of repair work on it is zero. I've done some service work - oil etc - but its never let me down on the road and the only niggle has been replacing the battery when it was left for 3yrs one time.
Second - mainly because its vastly exceeded my reliability expectations - is my ancient 125 Suzuki. It just keeps going. It's not fault free but its only let me down once when salt water shorted out the plug while waiting for a ferry at Dover.
Because I rarely buy mainstream adventure bikes my choices are all going to be left field oddballs. At the moment I'm trying to get an ancient 250 two stroke reliable enough for a long trip. I'm fully expecting some side of the road 'experiences' - even new they weren't that reliable - but it just has to be good enough. If it was a 1250GS - or even a CB500X - I'd be applying different criteria.
|