• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

1981 GS850G Altitude correction idea

  • Thread starter Thread starter SteveR
  • Start date Start date
S

SteveR

Guest
I am based in Houston (sea level) and the mixture is set up just right. My bike is completely stock.
On a trip this summer to Yellowstone I noticed the higher I climbed the richer the bike. So, I opened the air box and removed the filter and the fuel mix leaned out.
My idea is to make a hole in the air box on the carb side and adjust the opening for high altitudes. This way I would not need to remove the filter.
What do you think?
 
How often do you get to higher altitudes, and how long do you stay up there? :-k

Going richer is safer than going leaner, so, although you might lose a bit of power while at altitude, is it really worth all the effort? You would really have to do plug chops at altitude with different airbox openings to see what is the right amount of opening to get your jetting correct.

Go for it if you want, but it sounds like too much bother for me. :rolleyes:
 
Steve said:
How often do you get to higher altitudes, and how long do you stay up there? :-k

Going richer is safer than going leaner, so, although you might lose a bit of power while at altitude, is it really worth all the effort?
Click to expand...

Removing the airbox lid on my '79 GS1000E is the difference between riding slowly to 14,000 ft. or not getting there at all, the bike is adjusted very well for 5,000 ft to start with.

With you newer bike and it's CV carbs it should be a lot less rich at higher elevations, should run fairly well if a little underpowered.

Looking to go fuel injection so it won't be an issue anymore. :-)
 
Make a sliding door in the airbox, then rig up a bag of Fritos using some duct tape and baling wire so that the expansion of the Fritos bag at higher altitudes yanks the door open. The higher you go, the wider it opens.

Some say it's OK to use a bag of potato chips or Funyons, but I'm a firm believer that the higher density of Fritos helps maximize your air/snack ratio and thus gives you the most effectiveness.

You'll need to experiment with various size Frito bags to achieve the proper leverage ratio. The two ounce bags in most gas stations are usually a good starting point.

Also, beware of the flimsy packaging used for "off brand" corn chips. Some of these have been known to explode near the summit, scattering salty snacks everywhere and allowing the airbox door to slam shut, which hinders progress greatly.

The Fritos oxygen enrichment system also has the advantage that if some other mechanical problem waylays you in the mountains, you can open the Fritos as a last resort and stave off hunger for a little longer. This could help avoid an ugly "Donner Party" type situation.
 
I went over Tioga Pass-Yosemnitie on a sohc 750 Honda. Going up at 8-10K ft I was thinking I could push it faster. Yes the thin air does a # esp on low compression motor
 
You must log in or register to reply here.
Back
Top