KLR Jetting Observations - Kawasaki KLR 650 Forum
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post #1 of 4 Old 05-02-2011, 06:49 PM Thread Starter
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KLR Jetting Observations

Ok, I have been riding my '07 KLR for the last few weeks with this setup: KLX needle, middle clip position, 150 main jet (148 stock), 2.75 turns on idle screw, Uni filter, snorkle removed, slide drilled, FMF Q4 silencer. All parts came from Schnitz. I am at 3300' msl, and recently took a trip to Ruidoso, NM where we rode at elevations ranging from 6000' to 9500'.

By most accounts I have read on this site and elsewhere, my bike should be way rich, especially at higher altitudes. However, several plug checks both at home and in NM revealed just a light tan color on the plug. The bike runs fantastic, pulls hard, etc, etc. The only downside I've noticed is mileage in the 37-43 mpg range (my heavy right hand may play a small part there ). I have checked several times for air/exhaust leaks and have found nothing. Any thoughts?

Dave

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2008 B-King - Bone stock

2007 KLR650 - Moab shock - Progressive springs 10wt oil - Happy Trails fork brace - Steel front brake line - ProTaper Evo - Acerbis Rally Pro guards - Uni Filter - KLX needle - De-Snorkled - Slide drilled - FMF Q4 - DooHickey done - Swingarm pivots drilled/tapped for grease Zerks - Custom (homebuilt) mount and Pelican 1450's.
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post #2 of 4 Old 05-02-2011, 06:52 PM
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post #3 of 4 Old 05-02-2011, 08:36 PM
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Quote:
Originally Posted by Pistoldave View Post
Ok, I have been riding my '07 KLR for the last few weeks with this setup: KLX needle, middle clip position, 150 main jet (148 stock), 2.75 turns on idle screw, Uni filter, snorkle removed, slide drilled, FMF Q4 silencer. All parts came from Schnitz. I am at 3300' msl, and recently took a trip to Ruidoso, NM where we rode at elevations ranging from 6000' to 9500'.

By most accounts I have read on this site and elsewhere, my bike should be way rich, especially at higher altitudes. However, several plug checks both at home and in NM revealed just a light tan color on the plug. The bike runs fantastic, pulls hard, etc, etc. The only downside I've noticed is mileage in the 37-43 mpg range (my heavy right hand may play a small part there ). I have checked several times for air/exhaust leaks and have found nothing. Any thoughts?

my .02...

Your gas mileage seems to indicate that your rich. My 08 gets about 50 mpg no matter how I ride it. All I've done to it is the .22 mod stock main jet.

You are getting an average on your plug reading not a specific jet range. Short of an exhaust air fuel sensor the only way to check your mixture is by doing plug chops but they are a hassle to do especially on a KLR.

The conventional wisdom is that the stock bike is lean on the low speed circuits and rich on the main. Try dropping the main a couple of sizes and see if your gas mileage improves and if it still runs good Bob's your uncle.

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 #4 of 4 Old 05-02-2011, 11:11 PM
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Just for comparison sake here are my carb settings. KLX needle on 2nd groove from top, 142 mainjet, idle screw at 2.0 turns out, slide drilled 7/64ths, snorkle removed and full L-mod, LEXX exhaust. Base elevation here is 1000ft. My MPG ranges from 42 to 45. 42 is my usual mileage for my commute of 32 highway miles crusing 70-75mph. My motor is now a 685 but I've run this setup on both displacements.
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