2011 klr carb jetting - 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 18 Old 10-17-2011, 10:07 PM Thread Starter
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2011 klr carb jetting

I have a 2011 klr and I put a k&n air filter on it but it just agravated the bikes already tragically lean set up and I was wondering what would be a good place to start with jet size
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post #2 of 18 Old 10-17-2011, 10:15 PM
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After you take off the K&N because you hate how often it gets dirty and install another (better) air filter, the Moose racing Stage 1 kit is pretty good (yup I know it costs more than .22 cents) and it has every jet, needle, etc. you'll likely ever need.
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Mark
"My KLR belongs to God, when he wants it clean he washes it."
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post #3 of 18 Old 10-18-2011, 06:51 AM
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I have a 2011 klr and I put a k&n air filter on it but it just agravated the bikes already tragically lean set up and I was wondering what would be a good place to start with jet size
What suggests your bike is, "tragically lean," bigjug?

Did you perform a throttle-chop plug reading? Make a dyno run with air/fuel ratio chart?

Have you adjusted your fuel screw (I'd recommend 1.75 out as a starting point)?

Have you shimmed your needle?

Without credible symptoms of deleterious fuel-lean mixture, with fuel screw adjustment correcting idle-regime air/fuel ratio, and a needle shim adjusting mid-range air/fuel ratio, your OEM carb oughta be pretty close to optimum, with only a trick air filter as a mod, IMHO.

YMMV, and if it does, scads of aftermarket jet kits abound (although I remain skeptical regarding performance expectations harbored by some).
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post #4 of 18 Old 10-18-2011, 09:15 AM
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Quote:
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I have a 2011 klr and I put a k&n air filter on it but it just agravated the bikes already tragically lean set up and I was wondering what would be a good place to start with jet size

Start with the .22 mod. The stock bike is lean on the pilot and needle jet circuits (for emissions) but rich on the main. The main jet is generally not a problem as most don't stay in that throttle range (3/4 to full) for extended periods.

Motorcycle Carb Theory 101

BTW the K&N filter has been shown to be more restrictive than the OEM or a UNI.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #5 of 18 Old 10-18-2011, 12:55 PM Thread Starter
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What is this 22 mod I hear lots of people talking about. I have no idea what its about and I can't find info about it. Most importantly will it work on newer klrs
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post #6 of 18 Old 10-18-2011, 01:49 PM
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Highly recommend a JD Jetting kit. Again , not 22 cents, but it comes with all jets & custom needle (not simply repackaged) and the owner James is available to give advice. My bike runs strong and no problems after install. He rides a KLR and knows about them- tests all kits at various altitudes.

http://www.klrforum.com/showthread.php?t=10171

PPMC #4
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post #7 of 18 Old 10-18-2011, 02:31 PM
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What is this 22 mod I hear lots of people talking about. I have no idea what its about and I can't find info about it. Most importantly will it work on newer klrs

Here you go yea it works with the Gen 2s.

Basically you get a couple of #4 washers to raise the needle (22 cents or so) drill the slide a bit and pop the cover off the air screw to adjust.

Couldn't find any info?

KLR .22 mod

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #8 of 18 Old 10-18-2011, 03:04 PM
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What is this 22 mod I hear lots of people talking about. I have no idea what its about and I can't find info about it. Most importantly will it work on newer klrs
Rather well known; adjustment of fuel screw (addresses idle mixture), shimming of needle (fuel-enriches mid-range operation), and drilling of slide (enhances throttle response).

"22-cents" refers to the nominal cost of two $ 4 washers used to shim the needle; I think you could get by with only 11 cents expended, in your case neeeding no more than one washer.

Yet, bigjug, you didn't answer my previous question: How do you know your KLR runs "tragically lean?"

And, just curious, what are your expectations from a jet kit?
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post #9 of 18 Old 10-18-2011, 05:12 PM Thread Starter
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I pulled the spark plug and it looks white and ashy. To answer the second question I don't expect that jetting it will make it run 9s in the quarter. I just want to get all that's there to get and I'm the kind of person I love to tinker with something till I get it just to my liking
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post #10 of 18 Old 10-18-2011, 06:39 PM
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I pulled the spark plug and it looks white and ashy.
Throttle-chop plug reading, or--examination after idling?

If the latter, you're reading the idle mixture, not the mixture controlled by the main jet.

Adjusting the fuel screw will cure a fuel-lean air/fuel idle mixture.
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