AT in HIMALAYAs, 5400 meters a.s.l. !!!
Just to let you know about our experience with hight altitudes.
In September 2007 our Polish team shipped 6 ATs and BMW R100GS to Indian Himalaya where we ride through some of the higest motorable roads in the world. We went far above 5400 m over sea level
Here are the details of our trip:
Indian Himalaya by 6 Africa Twin and 1 old good BMW GS... - ADVrider
But this is a thread for tech-talk. This what we did to get that high:
1. KN filters
2. Dynojets stage1, needles and washers only
3. Main Jets
4. Mixture screw
AD1. KN allows more air to carburators and this is crucial. Also you can clean your KN which improves its performance. Dirty KN was causing problems for one of our guy (with pillon rider+ equipement) when he stopped on steep ascend.
AD2. The set of Dynojet you need only to install needles in your carb. They have carbs which allows regulation. In this case you need to lower needles by one carb in order to lean mixture. One of our member did not do it and at the level of 4500 he had to re-jet. It is possible without complete removal of carbs. BUT TRY AT HOME first as you need special set of tools a access one of the screew from membrane-caps
Ad3. You need to run leaner - so you also need smaller Main JETs.
As we have all makes of AfricaTwin up there this is what you need:
AT Nominal JET
RD04 118, 122
RD07 118, 120
RD07 ('96 Austrian) , 120
AT High altitude JET
RD07 ('96 Austrian) 115
Turn IN mixture adjustment screw by 1 turn (from 2,25 to 1,25) only when you have idling problems.
With these settings we experience poor performance of engine (no power) but bike was able to reach all three India's highest motorable passes. (pilion riders and lot of stuff)
The re -setting of jets is to be done at home. Lowering needles can also be done at home - risking only lean riding (colour of spark was OK anyway) or you can lower your needles at 3000- 3500 m a.s.l. if you dont worry dimantling you tank and airbox. Takes about 30 minutes .
Good luck HIGH-altituders!!!!
any questions - let me know
Last edited by podosek; 18 Sep 2007 at 10:37.