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Western Riders Covering - Colorado - Montana - Utah - Wyoming

Thread: Carb jetting for altitude? Reply to Thread
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  Topic Review (Newest First)
08-08-2016 09:46 PM
pdwestman shaoul,
Glad that you had a great ride. Thanks for the update.
08-08-2016 07:49 AM
Damocles Thank YOU for the feedback, shaoul!

Glad you had a good ride.

Knowledge of results, after-action reports, are far too rare on motorcycle websites, IMHO. Your account, sharing your experience, gives valuable closure to those who posted in their efforts to help.
08-07-2016 10:23 PM
shaoul Just got back from covering the southern part of the COBDR with the stock settings of the carb. While there may have been a decrease in power it wasn't significant enough to effect the ride. I had removed the snorkel in hopes that it might provide some more air..who knows if it did. All I can say is that the KLR performed really well at altitude, on the trail and on the pavement. Great trip! Thanks for the input.
07-13-2016 11:52 AM
shaoul Thanks to all that weighed in on this. You've given me the confidence to go stock for the week. Or perhaps just gave me enough validation of my desire to not mess with the jets. There are always various opinions and my riding buddies were all suggesting re-jet. Of course if I run into any problems I won't expect much sympathy from them! Will give a ride update at the conclusion of the trip.
07-09-2016 08:45 PM
Spokes I live in Colorado at 6,000 ft and ride an '06. I've ridden both the Great Divide and the TAT and never touched the carb. My son did the same on a '14 NE and also had no problems. Would they have had a little more performance if we had been changing jets? Maybe, but we were both happy with stock and they both ran fine from sea level to the highest passes. If you're a gear head and like playing with it, do it. If not, you'll be fine.

Sent from my iPhone using Tapatalk
07-07-2016 11:51 AM
justjeff Having ridden at elevations over 10000ft in the Canadian Rockies I see no need to rejet for a holiday. I might think of removing the airbox door for a temporary leaner mixture but would only rejet if I was living there. If you are just going through mountain passes the KLR has plenty of power even with a slight loss on being rich at high elevation. From stock KLRs are jetted lean for emissions so running at high altitude is actually compensating for the overly lean emission jetting. I notice very little power difference on my '11 while at altitude.
07-07-2016 11:39 AM
DPelletier Yep, I'm with Paul and Damocles; the CV carb is self-adjusting for the most part.

07-06-2016 10:53 PM
Damocles Cool; your call!

No matter what you do, you'll lose power at altitude.

And . . . should you re-jet, you'll need to restore lower-altitude jets when you return home.

Maybe this is a job for, "Dial-A-Jet!"

Regardless: Your bike, your call; best wishes, let us know how the trip went.
07-06-2016 09:57 AM
shaoul all, thanks for the feedback. Still undecided will let you know which way I go.
07-05-2016 09:15 PM
Originally Posted by shaoul View Post
Reaching out to you rocky mountain riders with a question. My 08 KLR is stock jetting and runs nicely in my home terrain which doesn't exceed 4000 feet. Do I need to change from stock jetting for the altitudes in CO? If so, what is recommended? I am riding the COBDR later this summer? Thanks!!
As suggested by Damocles, the stone stock KLR650 is perfectly capable of riding the COBDR or Ouray/Silverton/Telluride area with stone stock jetting. Even at California Pass, elevation of 13,600 I think I remember.

The one thing that I will suggest is, Turn-Up your Idle Speed to 1300 +or- 1000 with fully warm engine. It will start better. And it can be Totally Normal to need to use Choke after just a 20-30 minute lunch break in the cool mountain air!

One more note, Do Not just tap and release the starter button!
Crank IT! The system is not like a car, it will not 'grind the gear'.
If you attempt a warm/hot start and it doesn't immediately start, gently open the throttle a 'smidgeon', while still cranking. This procedure increases the 'cranking engine Compression' and slightly 'Leans' the low speed mixture.

So I now count 3 very minor 'tips', with Zero wrenches.

Ut Oh!
Tip #4 involves wrenches,
Check your Valve Tappet Clearance and set to the Wider end of Specs if you haven't all ready done so! Especially the RH Exhaust Valve. Why? To ensure the most Cranking Compression! And is just 'Good Maintenance'.
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