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-   -   Africa Twin at altitude (https://www.horizonsunlimited.com/hubb/honda-tech/africa-twin-at-altitude-25046)

Del Boy 9 Jan 2007 13:17

Africa Twin at altitude
 
Hi All,

Here's a question for Twinkie owners who've ridden their ATs at altitude. Did the bike cope OK with the thinner atmosphere or did you re-jet the carbs and if so, what size jet did you use? Also, what are ATs like on crap fuel?

Thanks in advance. Derek.

frnas 9 Jan 2007 19:13

That is a difficult question. I have ridden @ two up in high alltitude on crapy fuel, and the peformance is piss poor. But adequate, compared to the work to change the jets. One up was much better. I only changed the air filter for a foam one, for more air. I felt a clear performance loss going over 3600 m.

The @ can handle quite low octane in its low tune.

Frode

paul_r 10 Jan 2007 01:02

I agree with everything said before, I used 'crappy fuel' aka the cheapest I got in the usa down south somewhere, THe alien highway (extraterrestorial highway) and run out of gas 15 miles before I should have.

Just some thoughts, since then put in the best I could

Paul

mmaarten 14 Jan 2007 09:54

even with 15% alcohol
 
I took the AT to 5000 meter and it did fine. Yes, loss of power, no ideling, but running smoothly compared to many other bikes.
Also I run it on Brazilian fuell which contains 15 % alcohol. It idled a bit rough, but rode fine. After ajusting the idle-jet's (1/2 turn out) it ideled as if it was an alcoholic. (I mean good ;))

I have a K&N airfilter.

Maarten

markincyberspace 15 Jan 2007 00:48

12,000 foot off-road, one up worked, but I could feel that there was less pull than at sea level (both from me and the bike).

Should find out how 15,000ft on tarmac, two up feels in a couple of weeks.

Del Boy 15 Jan 2007 13:29

Thanks
 
Thanks Fellas,
Nice to know I can get away without fiddling about changing the jets!

Excellent website Mark:thumbup:

Cheers Derek.

Sambor 18 Jan 2007 08:52

Last summer 3 @ from Poland took a part in a journey to Tajikistan. Highest altitude was 4655 m. Fuel was very poor, about 76 oct. Bikes were weak, lost a lot of power. Pamir is a flat plateu, but max speed at altitude 4200 was about 100 km/h. We didn't opened air filters, we didn't re-jet carbs.
But this year we will go higher, and we will re-jet carbs ;)

podosek 19 Jan 2007 08:10

Quote:

Originally Posted by frnas
I only changed the air filter for a foam one, for more air. I felt a clear performance loss going over 3600 m.

Frode

Did you cut the foam shape yourself? Or this is something available as replacement? And how do I know that particular foam actually allow more air? Thanks in advance

frnas 26 Jan 2007 09:14

Foam air filters
 
Hello

I made myself one from a Twin Air unit for an Yamaha tenere 88-89. I do not know know for certain that the foam one let more air through. But i think so, from the look of it. I was driving with another @, hi was one up, I two up. His bike lost power on an lower altitude than mine, he ended up taking out his standard airfilter. But this may be just diffrences between acceptable power preferences between the two of us.

The main reasin for getting an foam, is the fact that it is washable. Then you are shure the filter aint clogged when entering high altitude. And a spare one thake no room, since you use the same "cage".

Frode

podosek 26 Jan 2007 09:29

Many thanks . So you are saying you put the foam inside the metal "cage" in the airbox (RD07 of course) and this is all. Typical air filter (paper of KN?)was removed at altitude and replaced with this shaped tenere foam until descent Am I right?

frnas 26 Jan 2007 15:53

Foam air filter for @
 
Hello

I use the filter cage. I cut away the paper from the original airfilter. Used a Dremel to grind away the glue. Then I used epoxy to fill up the filter to the correct sice for the Tenere air filter. It make sense, I hope, when you see the @ air filter.

Frode

markincyberspace 23 Feb 2007 00:37

Still ok....
 
4,516 m just completed the other day. It was loaded, two up and still going strong. What a great machine...
:scooter:

Del Boy 26 Feb 2007 19:13

Quote:

Originally Posted by markincyberspace (Post 127757)
4,516 m just completed the other day. It was loaded, two up and still going strong. What a great machine...
:scooter:

Great news :D ! Glad all's going well with the bike, keep up the good work with your website Mark:clap: ! All the best for the rest of your trip.

Derek.

Caminando 27 Feb 2007 11:01

Quote:

Originally Posted by Del Boy (Post 128075)
Great news :D ! Glad all's going well with the bike, keep up the good work with your website Mark:clap: ! All the best for the rest of your trip.

Derek.

I'll second Delboys comments on your website - its really good!!

Good roads!
Buen viaje!

markincyberspace 28 Feb 2007 18:02

Quote:

Originally Posted by Caminando (Post 128153)
I'll second Delboys comments on your website - its really good!!

Good roads!
Buen viaje!

Cheers lads, I really appreciate your comments.:mchappy:

podosek 18 Sep 2007 09:31

AT in HIMALAYAs, 5400 meters a.s.l. !!!
 
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

Walkabout 18 Sep 2007 23:06

Jwd
 
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,

Camtracey 2 Oct 2007 12:34

one up / two up??
 
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

deandean 2 Oct 2007 14:16

Quote:

Originally Posted by podosek (Post 150976)
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

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:thumbup1:
Dean......ex pat cockney in exile in Spain

deandean 2 Oct 2007 14:19

Quote:

Originally Posted by Camtracey (Post 152840)
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

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:mchappy:


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