Hi-altitude jetting
Close
    
    
Page 1 of 4 123 ... LastLast
Results 1 to 10 of 31
Like Tree21Likes

Thread: Hi-altitude jetting

  1. #1
    Senior Member Darth's Avatar
    Join Date
    Nov 2013
    Location
    Timbercreek Canyon, Texas
    Posts
    1,829

    Hi-altitude jetting

    Hey guys, need a little advice.

    In a couple weeks we're going camping in several places in Utah.
    The typical altitude where we're going is ~9,000 ft.
    Where I live is ~3,400 ft.

    I'm wondering what jetting settings you guys are using who live or ride a lot at that kind of altitude.

    Oh, and does anyone know if Gregor is still making the pilot screw extensions?

    Thanks guys!

    And for your viewing pleasure:
    "Faster, faster, faster, until the thrill of speed overcomes the fear of death."
    - Hunter S. Thompson

    “It’s more fun to ride a slow bike fast, than a fast bike slow”.

    "The less horsepower a motorcycle has, the more it can teach you.” - Ben Bostrom

    And though a mountain may rise up and smack the livin' shit outta me,
    and wad up my bike somethin' awful...
    Still, I rise!
    (With apologies to Maya Angelou)


    "Give a Damn"
    - C. M. Howe, Jr.

    Hidden Content

  2. #2
    Senior Member RockyTFS's Avatar
    Join Date
    Feb 2011
    Location
    Hailey, ID
    Posts
    3,407
    Without knowing what year your bike is and what main jet is in there now, we could not make a recommendation.

    My 2010 with the stock 126 jet works OK up to 9,000....pilot screw two turns out.
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  3. #3
    Senior Member Darth's Avatar
    Join Date
    Nov 2013
    Location
    Timbercreek Canyon, Texas
    Posts
    1,829
    Quote Originally Posted by RockyTFS View Post
    Without knowing what year your bike is and what main jet is in there now, we could not make a recommendation.

    My 2010 with the stock 126 jet works OK up to 9,000....pilot screw two turns out.
    Thanks Rocky.
    My bike is a 2014, all jets stock, pilot screw out 2 1/2, no shims, no pipe, stock air filter.
    At 7,000 ft. I couldn't even keep it running, much less ride it.
    "Faster, faster, faster, until the thrill of speed overcomes the fear of death."
    - Hunter S. Thompson

    “It’s more fun to ride a slow bike fast, than a fast bike slow”.

    "The less horsepower a motorcycle has, the more it can teach you.” - Ben Bostrom

    And though a mountain may rise up and smack the livin' shit outta me,
    and wad up my bike somethin' awful...
    Still, I rise!
    (With apologies to Maya Angelou)


    "Give a Damn"
    - C. M. Howe, Jr.

    Hidden Content

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Senior Member methamphetasaur's Avatar
    Join Date
    Jun 2015
    Location
    Colorado
    Posts
    1,170
    I lived in Denver for a few years, and i rode with the stock jetting the whole time. I've ridden up to 12 thousand feet at least a few times and it was just fine. At 8000+ feet, 5th gear is useless, but it's fine if you are fine with not going fast.

  6. #5
    Senior Member old mad max's Avatar
    Join Date
    Mar 2011
    Location
    Gobles, michigan
    Posts
    1,826
    Our dubs worked great at 9,000'. Everything is stock.. OMM.

  7. #6
    Senior Member RockyTFS's Avatar
    Join Date
    Feb 2011
    Location
    Hailey, ID
    Posts
    3,407
    Quote Originally Posted by Darth View Post
    ......
    At 7,000 ft. I couldn't even keep it running, much less ride it.
    Strange, most of us with the stock 126 seem fine as posted above. Are you SURE your main is a 126? If I knew I was not going below 7,000 while on a trip I would stick a 122 in there, it was better above 10,000, although I did have my stock 126 as high as 12,000 and it did start and run, just didn't have any power.
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  8. #7
    Senior Member Fred's Avatar
    Join Date
    Dec 2011
    Location
    Turtle Wrangling the Sierras
    Posts
    19,069
    "At 7,000 ft. I couldn't even keep it running, much less ride it" - your bike, if stock in good repair, should have no problems running at 9,000 ft, much less be " un-ridable" at 7,000 ft.
    Thus your bike is likely not stock or not in good repair if the above quote is accurate. Before your trip I would assure yourself of clean air filter, good quality properly gaped spark plug, proper timing, valve adjustment and certainly confirm jetting, float height and visually inspect pilot needle for damage. There is a logical disconnect with the reported severity of symptoms at elevation and the reported condition of the bike which needs to be determined and corrected. Don't ignore the simple or seemingly
    dismissible assumptions, perhaps the enriching circuit was accidentally activated during prior experience at 7,000 ft. elevation. Good luck, these bikes do lose a bit of power and can blubber a bit around 9,000 ft but remain very ridable in my experience.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  9. #8
    Senior Member VintageGW's Avatar
    Join Date
    Aug 2013
    Location
    Fort Worth, TX
    Posts
    187
    Darth, I just returned from two weeks in the northern New Mexico mountains. Floor of the valley where I stayed was 8,650 feet and standard jetting (126 main) worked as well as here as anywhere. I rode to 11,000 feet and noted a power loss but no real issues. I suggest that you assure that the carb is clean, and the filter is clean and go for it.

    VintageGW's
    4 GL1000 Some of these are for sale....
    1 GL1800
    Gone to a good home - '04 TW200 - Mulita!

  10. #9
    Senior Member Darth's Avatar
    Join Date
    Nov 2013
    Location
    Timbercreek Canyon, Texas
    Posts
    1,829
    OK guys...you've convinced me I *should* be fine at 9K ft.

    The bike only has ~200 miles on it and the carb/filter/ignition, etc. are all stock.
    The only thing changed was the setting on the pilot screw. When I got it was set at 1 1/8th turn out. I reset that at 2 1/2 turns out to richen it up from factory lean settings.
    Something you guys didn't mention or verify is the pilot screw setting...comments?

    I'm going to tear down the carb and make sure no junk, twisted O-rings, blocked passages, etc.
    I'll re-verify it has a 126 Main but I'm sure it does.
    And I'll pay attention to you guys thoughts on Pilot screw setting.

    I appreciate your help guys!
    "Faster, faster, faster, until the thrill of speed overcomes the fear of death."
    - Hunter S. Thompson

    “It’s more fun to ride a slow bike fast, than a fast bike slow”.

    "The less horsepower a motorcycle has, the more it can teach you.” - Ben Bostrom

    And though a mountain may rise up and smack the livin' shit outta me,
    and wad up my bike somethin' awful...
    Still, I rise!
    (With apologies to Maya Angelou)


    "Give a Damn"
    - C. M. Howe, Jr.

    Hidden Content

  11. #10
    Senior Member Rhodetrip's Avatar
    Join Date
    Aug 2010
    Location
    Out wandering around
    Posts
    1,928
    Stock Bikes:







    jbfla, VintageGW, Tweaker and 1 others like this.

    "Me and Mrs Trip, we got a thing going on"... an on-going adventure...
    Hidden Content

    "When Piggies Fly" ...Me & Mrs Trip Cross the Pond
    Hidden Content

    "Take the Puppy to the Beach"...a dirt route across southern New England
    Hidden Content

    Latest Spotwalla: Hidden Content

Page 1 of 4 123 ... LastLast

Sponosred Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. Colorado/high altitude tw200 question
    By Adgilbert in forum Technical Help
    Replies: 29
    Last Post: 06-08-2016, 07:40 PM
  2. High altitude
    By alhunter in forum Technical Help
    Replies: 4
    Last Post: 05-11-2015, 05:44 PM
  3. Speaking of jetting for altitude...
    By Adam-n-nevada in forum Performance and Customization
    Replies: 11
    Last Post: 06-07-2014, 05:29 AM
  4. Question on high altitude jetting/operations
    By DaveyM in forum Technical Help
    Replies: 9
    Last Post: 07-21-2013, 10:45 AM
  5. High altitude jeting
    By Woodymuler in forum Performance and Customization
    Replies: 7
    Last Post: 06-22-2013, 11:47 AM

Search tags for this page

high altitude

,
jetting for a 2014 yamaha tw200 at 4500 foot elevation
Click on a term to search for related topics.