Yamaha UK have kindly loaned us a pair of XT660Rs for the journey, which we are modifying to give them even more off-road and distance capability. In order to cope with the breathless demands of high altitudes, we have the facility to modify the fuelling via a Dynojet Power Commander (a black box of electrickery) and a laptop. This won’t stop the bikes losing about half their power due to low oxygen density, but it should allow us to keep them running by maintaining the air/fuel ratios within acceptable limits.
We are also fitting hard (very hard) luggage, supplied by Metal Mule, and two-into-one, high-level exhausts developed for the same company by Scorpion. SW Motech centre stands will make the inevitable puncture repairs less of a hassle. Tyres will be Metzeler Karoos, the knobbliest road-legal rubber that can be accommodated on the XTs’ rims.
Other modifications include Renthal handlebars which are stronger, lighter and easier to repair than standard and Venhill braided brake lines to uprate brake power and feel. Lower ratio gearing, using lighter sprockets (again by Renthal) will be essential for hauling a down-on-power bike up steep and unmettled terrain.
We are carrying a lot of equipment. Expected temperatures on the trip will range from around +45 to -15 degrees, so we can’t get away with the usual do-it-all kit. We will also be doing a fair bit of trekking to get in shape and used to working at altitude, so will need specialist items like crampons, ice axes, ropes etc. Then there’s all that’s needed to camp in such diverse climates… So to back up our hard luggage we’ll each be using a Pac-safe stuff sack and Bagster tank bag.
For more details on bike modifications, luggage and clothing performance, keep an eye on our diary and product test pages.