Right i've made it to Salta.
This is the shock. It should have around 8.3" of travel and is adjustable for preload and rebound.
The shock is not leaking or anything. The bike just sits too low and there's only around 2.5-3" of travel once the bike is loaded up.
So either it's undersprung, the preload doesn't work, or I'm carrying too much weight (don't we always).
It's the OEM Sachs unit with hydraulic preload, new spring (put on before leaving the UK), and YS Rod.
I would have thought that a faulty preload would be picked up when it was serviced, hence me thinking that it's undersprung.
I did ask Dakar Motors if they might know someone, but they don't think I'll get a heavier spring in South America at all. Unfortunately no-one seems to know of anyone that can work on suspension outside of BA.
I'm now wondering which country is the easiest to import a shock? I did read a post about someone blowing a F650 shock and buying one from Touratech Peru. That had to wait a month in Bolivia, but I think most of that time was customs in Bolivia, as oppose to Touratech waiting for it to arrive from Europe.
If it's easy to import into Peru I could just have one delivered to Cusco.