high altitude mods, advice needed - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

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post #1 of 11 Old 04-13-2016, 11:18 PM Thread Starter
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high altitude mods, advice needed

I just ran north of Colorado Springs and back to Trinidad, about 400 miles at 75-80mph (5500-5800 rpm's).. I want to put on a 16 tooth but afraid I wont have the power to pull the grades or a headwind.
"Most" motorcycles with a carb run a little rich up here.
Question for anyone with experience at altitudes 5500ft+ if I do LEXX muffler, KN filter, open air box a little do I need to re-jet carb?
Will the exhaust and air mods be enough to pull my fat butt with a 16?

Love to hear from anyone with high altitude experience..
I am fairly new to KLR's but lovin it!!!

Thank you..
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post #2 of 11 Old 04-14-2016, 11:17 AM
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Originally Posted by gruet782 View Post
I just ran north of Colorado Springs and back to Trinidad, about 400 miles at 75-80mph (5500-5800 rpm's).. I want to put on a 16 tooth but afraid I wont have the power to pull the grades or a headwind.
"Most" motorcycles with a carb run a little rich up here.
Question for anyone with experience at altitudes 5500ft+ if I do LEXX muffler, KN filter, open air box a little do I need to re-jet carb?
Will the exhaust and air mods be enough to pull my fat butt with a 16?

Love to hear from anyone with high altitude experience..
I am fairly new to KLR's but lovin it!!!

Thank you..
I have ridden both of my KLRs from sea level in Houston to 13,000 feet in Colorado with no modifications to the carburetor. The constant velocity carburetor on the KLR automatically adjusts for air density changes at altitude.

You would want to make the same carb changes for opening up the exhaust and intake that you would at sea level.

No matter what you do, maintaining freeway speeds uphill above 5,000 feet with a 16 teeth sprocket will be difficult. The higher you go the more difficult it gets. That is what fourth gear is for.
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post #3 of 11 Old 04-14-2016, 03:34 PM Thread Starter
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Thank you, I forgot about constant velocity carburetors, I am more use too old school Harleys and British bikes.
4th was also a thought.. Just hoping to keep the RPM's down

The carb details answered everything I needed to know... thanks again!
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post #4 of 11 Old 04-14-2016, 04:01 PM
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gruet782,
7200-7400 rpm in 4th gear with a 15T, uphill or downhill in Wyoming or anywhere else is about 85mph.
I'll agree with GoMotor, that's what it is for.
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pdwestman
Modify at "YOUR OWN RISK"!

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post #5 of 11 Old 04-14-2016, 05:19 PM Thread Starter
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Last thumper I owned was a 500 BSA, hard for me to grasp a thumper doing 7200 RPM's, funny how times change...
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post #6 of 11 Old 04-14-2016, 07:48 PM
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gruet782,
Unless you have already ordered a K&N air filter, I'll suggest that on the KLR650, it is the least favored/endorsed air filter sold for the KLR650!
Why? One might ask.
Because of the smaller than average size of the air box and the metal Top of the K&N, the K&N has the lowest CFM of air flow.

Uni-Filter / Twin-Air / No-Toil and Stock are generally Recommended in this order. All are Oiled Foam type, no metal end cap.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 84,000+ miles & counting
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post #7 of 11 Old 04-14-2016, 07:58 PM Thread Starter
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I haven't ordered anything yet, may order Lexx MXe muffler tonight. I dont make a bunch of changes at once... one step at a time...

Thanks for the advice..
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post #8 of 11 Old 04-15-2016, 10:16 AM
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GoMotor nailed it; regardless of altitude you should rejet with exhaust and airbox changes. ...and ditto on Paul's comments on the K&N.

My advice?

- Order the Lexx.
- ditch the snorkle and do the L-mod or 4 1" holes in the airbox lid
- get the KLX kit from Eagle Mfg & Eng and follow the instructions ...also order the Uni Filter at the same time.

Dave
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post #9 of 11 Old 04-15-2016, 10:26 AM Thread Starter
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Thank you Dave...
Eagle even mentions high altitude in the description for the KLX kit..
Ordering it all...

Thanks again.. Gordon

"Things are made out of Stuff"
Bill Nye~

"Singularity is a scientific term for - We Just Don't Know"
Neil DeGrasse Tyson~

(2011 KLR)
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post #10 of 11 Old 04-15-2016, 02:38 PM
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Ordering it all...

That's how it starts!... LOL.

Cheers,
Dave
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