Fuel Adjustment for High Altitude - 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 5 Old 03-11-2014, 10:29 AM Thread Starter
Join Date: Feb 2014
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Fuel Adjustment for High Altitude

I am planning to truck my 2006 KLR from Texas to Colorado for a week of riding. I plan to spend most of the time 8000-11000 feet in altitide.

My bike's fuel/exhaust systems are stock except for the .22 cent mod and removal of the airbox snorkel.

I'm looking for recommendations/advice for carb adjustment and/or rejetting for high altitude riding.


Last edited by Tony839294; 03-11-2014 at 10:31 AM. Reason: correction
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post #2 of 5 Old 03-11-2014, 12:09 PM
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Power loss at altitude remains inevitable (lower oxygen partial pressure at altitude).

Re-jet? Back in the bad old days of carbureted automobiles, few motorists re-jetted their carbs when driving from Fort Worth to Denver!

Tightening slightly the idle mixture screw might be worthwhile; smaller main jet may optimize air/fuel ratio for Colorado, but . . . stock jetting would be close; men say they come lean from the factory; and advantage at altitude!

Wouldn't sweat the jetting particularly; my opinion only; YMMV.
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post #3 of 5 Old 03-11-2014, 08:15 PM
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Join Date: Jan 2014
Location: Cork, Ireland
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Hi, could fit a thumb turn mixture screw, make life easier for tweeking, but may be overkill for 1 week? Cheers.
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post #4 of 5 Old 03-12-2014, 04:29 AM
Join Date: Jan 2011
Location: NW MO
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Don't worry about it. I've made the same trip on a few occasions and any loss of power with a stock setup will be of no consequence. At 11,000+ feet you might notice it takes a millisecond or two longer to start, but that's about it.

In my opinion, the main thing is to have a really clean air filter when you arrive. It should stay that way for your week's worth of riding since not much filter-clogging dust and dirt will be generated above the Colorado timberline.

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post #5 of 5 Old 03-14-2014, 09:00 PM
Join Date: Nov 2009
Location: Lander, Wyoming
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The only thing myself and 2 other KLR riders had to do the first morning in Silverton was, Turn Up the Idle Speed, after 2-3 minutes on full choke.

28F. in mid August, them old gold miners were 'tough'!

The only other issue was 1 riders K & N AIR FILTER! DO NOT use one if you are NOT the lead dog!!!! It is too Small in a KLR.

Other than on the Highways you are Never on the Main Jet. And it is acceptable.

Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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