mixture screw - 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 16 Old 05-08-2011, 08:35 AM Thread Starter
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mixture screw

any one know how many turns out it should be?
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post #2 of 16 Old 05-08-2011, 09:32 AM
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any one know how many turns out it should be?
Some of the adjustment will be determined by the other modifications, if any, done to the air intake and exhaust systems. For a stock configured bike, two full turns out from stop is a happy medium. My bike has stock exhaust and air box, and my air / fuel [Pilot screw on most diagrams] screw is set 2.25 turns out from stop. My spark plugs read a nice tan, indicating a not to rich, and not too lean setting. I still get a little pop-pop on deceleration, that I live with with little aggravation. It's a thumper. They do that.

I ran the bike at 2.5 turns, and found my rear fender collecting black soot. A half a turn in to the 2 full turn position raised my operating temperature, and increased the decel popping. A quarter more turn out, and the decel popping decreased, no soot collection on the fender. For those that enjoy fiddling with air / fuel settings, adjustment screws with knurled knobs are available. As I'm not running the Dakar, or in terrain where the elevation changes 10,000 feet, I pick a setting and roll with it.

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post #3 of 16 Old 05-08-2011, 10:56 AM
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Where is it set stock?
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post #4 of 16 Old 05-08-2011, 11:47 AM
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Where is it set stock?
I've seen them set anywhere from nearly closed maybe 1/4 turn to about 1 3/4's out and everything inbetween.
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post #5 of 16 Old 05-08-2011, 12:06 PM Thread Starter
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i started around 1 3/4 turns and that made it run hot . i'm at 2 3/4 now runs much cooler but makes it smoke a bit. how about a 81 kl 250? where do i get this knob?
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post #6 of 16 Old 05-08-2011, 12:15 PM Thread Starter
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forgot it's all stock PO had it turned in all the and the spring holder for the slide in upside down
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post #7 of 16 Old 05-08-2011, 12:24 PM
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What works good/cheap on most bikes is just use a stubby screwdriver, or just a small standard drill bit.
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post #8 of 16 Old 05-08-2011, 01:54 PM Thread Starter
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out standing 2 1/4 turns out no smoke and runs cool even tried it on my kl250 it even runs better! now to find out why the fan won't come on
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post #9 of 16 Old 05-08-2011, 01:58 PM
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Don't know if all responders realize we're discussing a KLR250, NOT a KLR650 (this is the 250 forum, right?).

Service Manual recommends pilot screw out 2 turns on all US models.

The pilot (aka fuel, mixture) screw only dominates air/fuel mixture from idle to perhaps 1/4 thottle; won't make a bike run "hot" at other rpm.

Also, plug readings are only valid at the moment of shut-down, I'd imagine, as in--"throttle-chop" plug readings occur only after the engine is run for awhile at WOT (wide-open throttle) then killed with the kill switch as the bike coasts to a stop . . .

One last comment: Don't know if plug reading are valid anymore, given the wild and wacky blends of fuel (e.g., ethanol-laced) a benevolent and protective "green" government enables (i.e., There wouldn't be ONE DROP of ethanol fuel, without lavish government subsidies to the ethanol industry in the name of "GREEN."). So, pay $ 4/gallon, knowing two caribou at the North Pole don't have to walk around a drilling rig . . .

Last edited by Damocles; 05-08-2011 at 02:01 PM.
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post #10 of 16 Old 05-08-2011, 02:09 PM Thread Starter
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i was asking for my KL600 and threw in about my KL250 i don't have any KLR's yet
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