Salida, CO 7000+ feet
Close
    
    
Results 1 to 9 of 9
  1. #1
    Senior Member nunya's Avatar
    Join Date
    Sep 2014
    Location
    Elberta, AL
    Posts
    251

    Salida, CO 7000+ feet

    Would stock carb work fine at this altitude, or further tweaking. My sea level settings were a challenge at 4000, and guess they may suck here.

    I do have the ability to make changes even being on the road.

  2. #2
    Senior Member Fred's Avatar
    Join Date
    Dec 2011
    Location
    Turtle Wrangling the Sierras
    Posts
    18,702
    My California 2003 stock jetted, no needle shimmed carb did OK from 5,000ft up to 9,500 ft with the mixture screw set ~1.75 revolutions out from seated. Since then I have enriched things a bit with mixture screw now at ~2.25 revolutions out but have not since been above ~8,000 ft. However bike still runs well with no "blubbering" or obvious malaise at 8,000 ft. California jetting is slightly leaner but you might get acceptable results with simply turning in your mixture screw a bit.
    I would ride your bike as is in Salida and only tweak if it seems unacceptably weak. Colder Co. temps and any humidity might contribute to an effectively lower density altitude operating in your favor, or does that only work for aircraft?
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  3. #3
    Senior Member nunya's Avatar
    Join Date
    Sep 2014
    Location
    Elberta, AL
    Posts
    251
    Quote Originally Posted by Fred View Post
    .... Colder Co. temps and any humidity might contribute to an effectively lower density altitude operating in your favor, or does that only work for aircraft?
    I think aircraft are more sensitive to those specific changes......

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Senior Member RockyTFS's Avatar
    Join Date
    Feb 2011
    Location
    Hailey, ID
    Posts
    3,329
    Quote Originally Posted by nunya View Post
    I think aircraft are more sensitive to those specific changes......
    Not true. Aircraft only APPEAR to be more sensitive because they are generating a lot more power and ANY hiccup or loss of expected power REALLY gets your attention! All normally aspirated engines are affected by Density Altitude the same way, but the effects may be hidden at less than full power, which the TW certainly is going up a hill in 5th at 7,000 feet!

    I forget which year yours is, but any post 2001 should have a 126 main jet if not modded, and at WOT should work OK up to about 9,000 feet. I only start to see some bogging in 5th gear above about 6,000....all the lower gears are fine and I have never experienced any difficulty starting up to 12,000. You might screw in your pilot jet to the bottom and back it out only 1 3/4 turns for that altitude, but that only affects idle and below 1/4 throttle mostly. I do have to fiddle with my idle all the time at altitude, though.

    And Fred, not to put too fine a point on it, but the higher the humidity, the higher the Density Altitude. High, Hot, and Humid (and Heavy) are the three (or four) corners of the high altitude coffin for any non turbo aircraft.....and for us too, it's just that the penalty clause is not NEARLY as bad!........One of the many reasons I was happy to quit Flight Instructing in the Colorado mountains!
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  6. #5
    Senior Member old mad max's Avatar
    Join Date
    Mar 2011
    Location
    Gobles, michigan
    Posts
    1,824
    We have stock settings and we were up to 9,000 with out any problems............OMM.

  7. #6
    Senior Member nunya's Avatar
    Join Date
    Sep 2014
    Location
    Elberta, AL
    Posts
    251
    TBH i can't remember the jet i used, 135 comes to mind, but my brain could make up any number at this point. In any case, i took it for a short stint today, at or below 30 seemed to run okay. It currently starts with no choke at all. open it up past mid and it gets squirrely. took it up about another 200 feet in altitude on a trail today....again at slow speeds it appears okay. im only going to be here one more day so no point in messing with it and in 3 days i'll be at 1400' and lower after that...so....

    ill be checking local trails here in Salida and throw up another vid in the afternoon.

  8. #7
    Senior Member RockyTFS's Avatar
    Join Date
    Feb 2011
    Location
    Hailey, ID
    Posts
    3,329
    A 135?!!! Jeez, if that's true no WONDER it won't run well at altitude! I've never heard of anyone going larger than 132. I'm not aware there even IS a 135 available. Even a 130 would cause your problems at that altitude. Get your ass back down to sea level where it belongs!
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  9. #8
    Senior Member nunya's Avatar
    Join Date
    Sep 2014
    Location
    Elberta, AL
    Posts
    251
    Quote Originally Posted by RockyTFS View Post
    A 135?!!! Jeez, if that's true no WONDER it won't run well at altitude! I've never heard of anyone going larger than 132. I'm not aware there even IS a 135 available. Even a 130 would cause your problems at that altitude. Get your ass back down to sea level where it belongs!
    It was the procycle mod pack they have, so whatever was in there, based on what i researched on here was what i used. it was too long ago to remember.

  10. #9
    Senior Member RockyTFS's Avatar
    Join Date
    Feb 2011
    Location
    Hailey, ID
    Posts
    3,329
    Well, when you end up in Ft. Carson years from now you can stick a 126 or 122 in there.... So much great riding around C. Springs....great memories.
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

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. 1938 M-21 BSA Motorcycle - $7000 / Hayden, Idaho
    By littletommy in forum TW200 Classifieds
    Replies: 2
    Last Post: 02-04-2015, 06:14 PM
  2. Teikei @ 8-9,000 feet.
    By trailscout in forum Technical Help
    Replies: 8
    Last Post: 07-18-2013, 07:53 AM
  3. Customizing my feet
    By joedirt1970 in forum Performance and Customization
    Replies: 7
    Last Post: 02-05-2013, 09:28 PM
  4. Jetting for 10k feet
    By -Jake- in forum Performance and Customization
    Replies: 7
    Last Post: 08-07-2012, 05:04 PM
  5. Stock jetting at 9000 feet?
    By DonBenito in forum Technical Help
    Replies: 4
    Last Post: 07-25-2012, 09:26 PM