Jetting for Colorado - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 7 Old 06-07-2017, 06:33 PM Thread Starter
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Join Date: Oct 2010
Location: Broken Arrow Oklahoma
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Jetting for Colorado

I currently ride in Oklahoma, at about 600 feet, going to Colorado, Gunnison /Pitkin area, in August, should i look into Eagle Mike's KLX needle and Jet kit, specifically the 138 jet, my '06 KLR is stock with a Danmoto pipe, and Stock filter.
Thanks
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post #2 of 7 Old 06-07-2017, 07:46 PM
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Quote:
Originally Posted by Icepick View Post
I currently ride in Oklahoma, at about 600 feet, going to Colorado, Gunnison /Pitkin area, in August, should i look into Eagle Mike's KLX needle and Jet kit, specifically the 138 jet, my '06 KLR is stock with a Danmoto pipe, and Stock filter.
Thanks
Icepick,
The worst thing you could do to your jetting for a trip to higher altitude would be to richen UP the mid-range with the KLX needle, IMO.
If your jetting is 'lean & clean' at home it will run perfectly fine, up to about 13,000 feet for the short time you will be there. (Rarely on the Main Jet when riding in the rocks.)
You may need to turn up your idle Speed just a bit for better cold morning starts.
An adjustable low speed mixture screw would be my only real suggested recommended jetting change, maybe only half a turn in (leaner) from current setting, but probably Not Needed.
I live at 5357 feet and ride UP, mostly. Including Colorado.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 84,000+ miles & counting
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post #3 of 7 Old 06-08-2017, 03:33 AM
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And . . . even if OPTIMALLY jetted at altitude (i.e., run with IDEAL air/fuel ratio), you'll STILL lose power as you ascend . . . less oxygen available up high, therefore . . . you can process less fuel per unit time at altitude, thus develop less power . . . sad, but TRUE (as long as you are "naturally aspirated," as in no supercharger/turbocharger compensating for lower oxygen partial pressure . . . ).
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post #4 of 7 Old 06-08-2017, 10:22 AM
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Join Date: Feb 2017
Location: Denver, Colorado
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No need to re-jet

Hi -I live in CO and took my stock 2014.5 KLR up to about 11.500 feet this past weekend with no re-jetting, and little impact on performance. The bike required a little more time to warm up, and idled at about 250 rpm less than at home (5280 feet), but all in all, I wouldn't bother with any modifications for altitude.

Have a good trip!
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post #5 of 7 Old 06-08-2017, 10:52 AM
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The vacuum operated slide pretty much takes care of altitude compensation is my understanding. It has the effect of removing some of the abruptness of power coming on when twisting the grip from low rpm as well because of a slight delay in the slide operation inherent to the design.
I just did the 22 cent mod to the needle only which improved throttle response and eliminated a lean surging at speed on my 2016. It also has eliminated the varying idle speed I was getting where it would idle at 1100 then next stop it would idle at 1400. So far after a couple hundred miles of mixed riding it idles steady about 1100-1200. So far I'm happy with the mod and recommend it. I have no idea the effect at altitude yet.

2016 KLR 650
2017 BMW S1000RR (traded in for
2018 Ducati V4S
1983 GL1100 Goldwing
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post #6 of 7 Old 06-08-2017, 12:25 PM
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Glad your idle's steady now, dan filipi, but . . . doubt the 22-cent mod had any influence on the improvement.

Shimming the needle only fuel-enriches mid-throttle operation; shouldn't affect idle.



I think the CV carburetor's altitude compensation occurs because less-dense air at altitude has less Bernoulli-effect pressure differential ("vacuum") at velocity, thus lifting the slide and needle less at the same rpm as at sea level, thus . . . fuel-leaning the mixture.
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post #7 of 7 Old 06-08-2017, 01:26 PM
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Quote:
Originally Posted by Damocles View Post
Glad your idle's steady now, dan filipi, but . . . doubt the 22-cent mod had any influence on the improvement.

Shimming the needle only fuel-enriches mid-throttle operation; shouldn't affect idle.



I think the CV carburetor's altitude compensation occurs because less-dense air at altitude has less Bernoulli-effect pressure differential ("vacuum") at velocity, thus lifting the slide and needle less at the same rpm as at sea level, thus . . . fuel-leaning the mixture.
Agreed. Maybe a vacuum leak fixed itself who knows. Whatever it is, it's nice to have a idle that doesn't vary.

2016 KLR 650
2017 BMW S1000RR (traded in for
2018 Ducati V4S
1983 GL1100 Goldwing
2017 Yamaha R1
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