Best source of on-line mechanical advice for KLR's I've found is the DSN Yahoo group (DSN_KLR650@yahoogroups.com) and/or its moderator Fred Hink (http://www.arrowhea dmotorsports. com or email@example.com). Fred's a good mechanic with a business catering to KLR's, and the list includes a few highly qualified folks with extraordinary patience.
Since they're mostly US-based and don't ride internationally, they'll be fascinated by your location and journey. Plus Fred can get parts to you, although there are considerations of customs and shipping which might make this impractical. Post a clear summary of symptoms and what you've tried (like the one above) and think pure thoughts.
Hope that helps.
PS: I've been to La Junta; not a whole lot going on there. Coyhaique reportedly had a few good motorbike mechanics, and although parts are scarce they can get stuff from the capital easily enough. I was through there just after the earthquake and nothing was available, including money from ATM's, so I kept going.