Guys,
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
RD07A 115
AT High altitude JET
RD04 120
RD07 110
RD07 ('96 Austrian) 115
RD07A 115


Ad4.
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

That's Jolly Well Done, Podosek!

I know you have had all the "fantastics", "unbelievables" etc on your other posts at ADVrider; nothing can be added - your pictures are complete in all aspects and tell your story entirely.

Very best wishes for your future travels,

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Dave

Howdy!

Fellow newly discovered Africa Twin rider somewhat confused to what one up and two up means.

To an Australian, "two up" is a coin game you can even find is some Aussie casinos, but I assume this thread is referring to something else.

Any enlightenment?

Cheers

Hi Polish crew....i saw that trip on a link from Honda trial bike forum uk the other day....i was blown away by the photos and the write up.Well done on such a difficult trip....and good luck for your next....can i come on my rd07a please
Dean......ex pat cockney in exile in Spain

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Dean

G'day mate.
"Two up" means you have a pillion,and "one up" means you are riding with no pillion.....see....simple.
How do you Aussies refer to it? Just be interested to know!
Cheers mate

__________________
Dean