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Old 11-20-2013, 07:38 AM   #1
Umarth OP
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klr 2008 jetting for 14k+ feet

Buddy has a stock 2008 klr that runs out of power at around 14k feet. We'll be hitting close to 16k soon so this is a problem.

The stock main jet is, from what i found on google, 145. What would be a good ballpark step down for altitude? 140? 137.5?

Thanks,
-J
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Old 11-20-2013, 09:12 AM   #2
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try leaving off the airbox cover.
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Old 11-20-2013, 10:40 AM   #3
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The KLR loses about 1.2 horses per 1000 feet.
Try a UNI or OEM filter, don't use K&N as they have less air flow.
For that altitude I'd choose a 135 or even a 132 and turn the fuel screw in a bit.Make sure you won't be too lean on your way back down.

Here's a good reference
http://www.ultralightnews.ca/rotax50...ctionchart.pdf
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Old 11-20-2013, 10:42 AM   #4
FILLETI
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+1 on removing the airbox cover. It definitely helps @ 12,000+, but I'm not sure if it's enough for 16,000.
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Old 11-21-2013, 04:58 PM   #5
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How much time will be spent over 14K? That's the highest I've ever ridden and even FI bikes are noticeably down on power at that altitude.

You might be able to try a "Dial a Jet" http://www.thunderproducts.com/dial_a_jet.htm that way you could lean the bike out as you go up and then enrichen it as you get lower in altitude. I'd hate to lean a bike out just for some limited time at altitude and then run too lean and damage the engine at lower altitudes.
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Old 11-21-2013, 09:50 PM   #6
Kommando
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Quote:
Originally Posted by Umarth View Post
Buddy has a stock 2008 klr that runs out of power at around 14k feet. We'll be hitting close to 16k soon so this is a problem.

The stock main jet is, from what i found on google, 145. What would be a good ballpark step down for altitude? 140? 137.5?

Thanks,
-J
Unless you're running it at WOT and having issues, leave the main alone. Try just taking the airbox door off. Make sure the air filter is clean too.

If this doesn't cure issues, and your mid-throttle metering is controlled by an adjustable needle in a vacuum slide, adjust this needle leaner then tune the idle-mix screw. If you're having issues at WOT with the airbox opened, step down a size in the main jet, then tune the other circuits.
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Old 11-21-2013, 11:10 PM   #7
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the stock KLR needle doesn't adjust, so unless you put in a Dynojet kit or a KLX needle you're out of luck changing the midrange.

the main jet is mostly top end

all you can easily do is screw in the pilot screw, but that really only helps the bottom 1/3 of the throttle (or less). the screw is covered with a small plug that has to be drilled & pried out. research the 22 cent mod if you haven't done that yet

you could try lowering the float level I spose

heres a link that talks about the CV40:

http://www.gadgetjq.com/keihin_carb.htm
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