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Old 04-05-2011, 06:17 PM   #16
fishkens
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Page 10 in the Bing manual goes into this in depth with a formula and chart for temp and elevation.

In short it says to compensate with the idle mix screw as SS says and then adj. the main jet.

Then it provides this example:

- Motor is well tuned in Galveston, TX (elev. 7') at 86 degrees; going to Denver, CO (elev. 5250') at 50 degrees would be roughly the same with a 145 main jet. If the temp was 86 degrees in Denver you'd go to a 142.

Much like the feedback already provided.
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Old 04-05-2011, 06:22 PM   #17
hardwaregrrl
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Quote:
Originally Posted by supershaft View Post
The atmosphere isn't linear. There is a Big Diff between 12 or 14 thousand feet and 16 thousand feet.
Good to know you're still a pain in the ass!! I wrote "only" in red for you, happy?
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Old 04-05-2011, 06:46 PM   #18
Lornce
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At 18.5k ft I felt drunk. But I was on foot.

You could drop your needles if you didn't mind putting them back when you returned to lower altitudes.

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Old 04-05-2011, 07:02 PM   #19
fishkens
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Originally Posted by Lornce View Post
At 18.5k ft I felt drunk. But I was on foot.
I'm only at 60 ft above Puget Sound right now and I feel drunk. And I'm sitting on my butt.

Hmmm...maybe I need to check other parts of the equation.

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Old 04-05-2011, 07:06 PM   #20
Lornce
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Originally Posted by fishkens View Post
I'm only at 60 ft above Puget Sound right now and I feel drunk. And I'm sitting on my butt.

Hmmm...maybe I need to check other parts of the equation.

So many variables...

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Old 04-05-2011, 07:09 PM   #21
supershaft
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Originally Posted by hardwaregrrl View Post
Good to know you're still a pain in the ass!! I wrote "only" in red for you, happy?
Why wouldn't I still through in that tidbit of info? Some might not realize how the atmosphere stacks up. Rub some ointment on that ass for me and lets talk some more about riding at extreme altitudes!
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Old 04-05-2011, 07:22 PM   #22
hardwaregrrl
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Originally Posted by supershaft View Post
Why wouldn't I still through in that tidbit of info? Some might not realize how the atmosphere stacks up. Rub some ointment on that ass for me and lets talk some more about riding at extreme altitudes!
Nice....
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Old 04-05-2011, 07:34 PM   #23
crazydrummerdude
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Originally Posted by Lornce View Post
At 18.5k ft I felt drunk.
Hypoxia, baby! Try it at 25,000. I'm "certified" by NASA up to 25,000! (Whatever that means.) They put us in a room and sucked "all" the air out. One guy in the group before me started tap dancing, but after it was over had no recollection of it!
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Old 04-06-2011, 12:25 AM   #24
boxerboy81
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Cerebral oedema is deadly. Pays to be prepared.
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Old 04-06-2011, 02:41 AM   #25
Lornce
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Originally Posted by crazydrummerdude View Post
Hypoxia, baby! Try it at 25,000. I'm "certified" by NASA up to 25,000! (Whatever that means.) They put us in a room and sucked "all" the air out. One guy in the group before me started tap dancing, but after it was over had no recollection of it!
Yikes. Sounds like a safe spot to try it, anyway.

Put my pack down to take a break at the top of the pass 18.5k (Thorung La for those who've been). Continuing on I'd covered three or four hundred meters before realising I didn't have my pack on. Larkya La was a similar altitude, but I'd been at 12k - 14k for two weeks so it didn't seem to affect me as much.

Altitude and pressure are not linear.
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Old 04-06-2011, 03:03 AM   #26
Paul Mihalka
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Many-many years ago (196x) my brother and wife and I and my wife, were driving up the Nevado del Ruiz in Colombia. The road goes up to 4.800 meters, close to 16.000 ft. Driving a Mercedes 220 - not doing well, but made it.
Our actions at that altitude: My brother, a peaceful kind of guy, madly arguing with us. My sister in law, a expert photographer, reloaded a already exposed film into her Rolleiflex. My wife getting crying attacks. Me, trying to restart the car with a lot of throttle and clutch, repeatedly trying to start with the gear in neutral. If you have to make decisions, it's a dangerous place.
OTOH I crossed many times with my R90S the highest point of the Venezuelan Andes main road, Pico del Aguila, at 13.500 ft, without any problem.

Paul Mihalka screwed with this post 04-06-2011 at 03:11 AM
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Old 04-07-2011, 05:26 AM   #27
chasbmw
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When I took my r80 to 16000 ft in Peru, I fitted a smaller main jet and hotter plugs, I reset the idle at 8000 ft, bike ran ok but big loss of power due to reduction of O2. Body was ogish but v tired all on dirt roads. Snow at the top.

Object is to keep the mixture within reasonable operating parameters so it will start at altitude and to reduce fuel consumption.
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Old 04-07-2011, 06:10 AM   #28
datchew
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Quote:
Originally Posted by fishkens View Post
I'm only at 60 ft above Puget Sound right now and I feel drunk. And I'm sitting on my butt.

Hmmm...maybe I need to check other parts of the equation.

Awesome.

10k feet is NATOPS limit for not having O2 FYI. Hypoxia is weird stuff.
Any good helicopter aircrewman has broken that and other rules just on principle though.
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Old 04-07-2011, 07:46 AM   #29
Grouik OP
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Quote:
Originally Posted by Airhead Wrangler View Post
I've had my R80 over 5000 meters without any trouble (other than seriously low on power). Just go do it.
Ok , I will go !!!
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Old 04-07-2011, 07:48 AM   #30
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Originally Posted by mark1305 View Post
Yeah, if you have the Bing CV type carbs, they are pretty much self compensating for altitude within normal operating conditions. You will experience the loss of power, but no tuning can restore that power - in simplistic terms, it is a function of the lower atmospheric pressure and the resulting lower oxygen going into the motor as altitude increases.
Thank you for the explaination, easy, I will go
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