Carb rejetting - Kawasaki KLR 650 Forum
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post #1 of 7 Old 12-16-2013, 07:24 PM Thread Starter
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Join Date: Nov 2013
Location: Rio Rancho, New Mexico
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Carb rejetting

Hey everybody,

New to the forum & I have a carb. question for my 2013 KLR. After I do the .22 cent mod, what size of jet would you recommend for my bike? Everything is stock and it seems to pop quite a bit when decelerating. I am @ 5200 feet elevation wise. I appreciate any help!

Ride safe,
Pikester
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post #2 of 7 Old 12-17-2013, 12:15 AM
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Join Date: Apr 2013
Location: N AL, Fayetteville, TN
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The 22c mod is pretty-much a re-jet mod, it raises the needle, so it makes a smaller needle/kinda like a bigger jet. Choose which one you want, I recommend the 22c.
It gave me a little more power and better mpg. My carb does fine at 4-5k'.
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post #3 of 7 Old 12-17-2013, 05:12 AM
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Quote:
Originally Posted by Pikester View Post
New to the forum & I have a carb. question for my 2013 KLR. After I do the .22 cent mod, what size of jet would you recommend for my bike? Everything is stock and it seems to pop quite a bit when decelerating. I am @ 5200 feet elevation wise. I appreciate any help!
First, welcome to the forum!

Slight backfiring during deceleration ain't no thang, IMHO; may be reduced by adjusting the FUEL SCREW. Google, "Care and feeding of the CVK40" for a good primer on the carb operation, and location and access to the fuel screw. About 1.75 turns out from a SOFT bottoming is a good starting point for a stock engine, IMHO, in contrast to what a service manual might say.

The 22-cent mod doesn't affect jetting, IMHO. Rather, raising (shimming) the needle fuel-enriches mid-range operation (might not be particularly effective or necessary at 5200 feet elevation); drilling the slide vacuum port may enhance throttle response.

Otherwise, with a stock engine, and essentially stock carburetor (stock needle, but shimmed one # 4 washer), I think your stock jetting's pretty close to optimum for typical KLR650 service life, although at your elevation, a smaller main jet may fuel-lean your mixture more optimally. Your bike, and YMMV ('Your Mileage May Vary').

No harm in experimenting with jetting; everything can be restored to stock operational condition if you don't like the results. My riding partner has 55,000 miles on his '08; been from Canada to Mexico; restored his carb to stock condition, early on, and left it that way.

Diverse opinions abound on jetting; everyone has one; find what works for YOU.

-----------------

Full disclosure: Near sea level operation; 22-cent mod (one # 4 washer, 7/64" vacuum port), 1.75 turns out on fuel screw, on my otherwise stock '07. Mileage in the high 40s, mpg-wise; starts, runs fine. "What? ME worry?"
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post #4 of 7 Old 12-17-2013, 11:42 AM
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Join Date: May 2009
Location: Indiana/ Michigan line at the Lake
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Damocles pretty much nailed it.

Here at 600 ft ASL I have the stock low jet,
idle screw out almost two turns, the .22 washer shim,
and to be safe a 150 main as the intake hole and exhaust
tip have been opened to a slightly larger diameter. I tend to ride
aggressively and let the engine spin into the 5's often. The 150
is probably overkill comparing that to my fear of a high rpm lean
condition. The main circuit actually does not see much service time
for most riders. I don't think it comes on until about 3/4 throttle.
That would only be during acceleration and maybe interstate riding.

The factory jetting being slightly lean is probably perfect for your area.

Have fun!,
Cheeeeeeeeeeeeeeeeeeap

This is my son, with whom I am well pleased." ----God
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post #5 of 7 Old 12-17-2013, 07:08 PM Thread Starter
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Location: Rio Rancho, New Mexico
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Thanks for the welcome everybody & the great info.! I am going to give the .22 cent mod a try & I am installing Eagle Mike's Doohickey kit when it arrives.

Ride safe,
Pikester
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post #6 of 7 Old 12-17-2013, 07:18 PM
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installed a dg exhaust

hi im a first time klr 650 owner I installed an dg exhaust I was woundering if I should leave it stock or do the 22 cent mod. if I do the mod whats the fuel miture setting best at
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post #7 of 7 Old 12-18-2013, 12:39 AM
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Location: N AL, Fayetteville, TN
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I removed the #2 exhaust baffle too. It really helped the 22c mod. It was worth the time and the $30 tip.
I'm usually about 1500' here, I do day-trips and weekends to the Smokey's. My stock set-up was sick at higher altitude.
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