2008 klr 650 Carb HELP - Kawasaki KLR 650 Forum
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post #1 of 19 Old 03-03-2013, 01:37 PM Thread Starter
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2008 klr 650 Carb HELP

Just put the DG r series pipe on and also did the 22 cent mod and drilled slide to 7/64ths. Drilled top of air box as well...... Runs great when warm....

When cold the bike doesnt want to start with the choke full on??? Should I try next size lerger main jet and provide more gas???
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post #2 of 19 Old 03-03-2013, 05:15 PM
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Just put the DG r series pipe on and also did the 22 cent mod and drilled slide to 7/64ths. Drilled top of air box as well...... Runs great when warm....

When cold the bike doesnt want to start with the choke full on??? Should I try next size lerger main jet and provide more gas???

Did the bike start OK before the mods? If not check the valves.

The pilot jet and air screw are the low speed carb circuit. Did you turn out the air screw about 2.5 turns when you did the .22 mod?

The main jet is for about 3/4 to full throttle. Carb 101

Oh yea welcome to the forum!

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 #3 of 19 Old 03-03-2013, 09:58 PM
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Good info Spec. I agree, did you remove the cover to open the screw?

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post #4 of 19 Old 03-04-2013, 02:52 AM
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Good info Spec. I agree, did you remove the cover to open the screw?
The plug must be removed to access the fuel screw.



On a stock engine, I'd start at 1.75 turns out, but . . . that's just ME!

Regardless, your bike should start with choke only applied, regardless of pilot (idle) circuit condition and fuel screw adjustment, IMHO.

When you throw the choke lever ON, you withdraw a plunger from an orifice in the carburetor, sumultaneously opening an air passage. Fuel flows from the opened orifice and mixes with the air from the opened passage, this fuel-rich air/fuel mixture is ingested into the venturi for starting the engine.

If your engine doesn't start on choke, I'd suggest you check your choke (i.e., "starting enricher") system--is the plastic cap holding the choke cable onto the carburetor body intact? Adequately threaded onto the carb body? When you manipulate the choke lever, does the plunger seat fully when OFF and retract sufficiently when ON?

Here's a diagram of the "choke" (starting enricher); vertical arrows represent air, little dots, fuel:



This circuit is separate from the pilot (idle) circuit. Not saying your fuel screw doesn't need adjusting, or that the pilot circuit passage is not obstructed, only--a functioning choke (starting enricher) oughta get your bike kicked off.

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

EDIT: Both images in this post come from the link Spec provided above ( http://www.gadgetjq.com/keihin_carb.htm ).

Last edited by Damocles; 03-04-2013 at 11:05 AM.
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post #5 of 19 Old 03-04-2013, 07:54 AM
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I've been wanting this photo. Thanks, Damocles.



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post #6 of 19 Old 03-04-2013, 10:12 AM
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That's a great photo
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post #7 of 19 Old 03-04-2013, 11:00 AM
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That's a great photo
planalp, Trundlebike; glad the image is useful to you!

Wish I could take credit for the picture, but--it's not mine; I give full credit, both images (carb and "choke") come from the link Spec provided ( http://www.gadgetjq.com/keihin_carb.htm ).

Last edited by Damocles; 03-04-2013 at 12:16 PM.
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post #8 of 19 Old 03-04-2013, 04:47 PM Thread Starter
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I drilled out the cover as shown on many threds and adjusted the screw 2 1/4 out. The choke worked perfectly prior to the DG slip on,secrw adj and 22 cent mod!!!!!
When I got home this afternoon same thing I had to lay on the starter for over a min before it would run by itself. After it started it ran perfect on high idle with choke all the way on???
Thenks for the replys.... You guys are great and extremely knowledgeable.
Robert
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post #9 of 19 Old 03-04-2013, 05:21 PM
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Just a suggestion . . . if you drilled the slide, you removed the mixing chamber cover.

The diaphragm sometimes is really reluctant to seat and to seal correctly in its groove upon reassembly.

I'd suggest you re-check your diaphragm seal; a diaphragm air leak can cause all sorts of chaos.

Again, just a suggestion; assume my "choke" check list is all A-O.K.
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post #10 of 19 Old 03-06-2013, 02:35 PM Thread Starter
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Starting/Choke issues

OK I removed the cover and diaphram and inspected as you suggested and also made sure the choke was inserted properly and adjusted. It will start after 3-4 attempts and once I get it running for 30 sec or so it idles higher and runs perfectly as its supposed to. Wonder why the delay on high /full on choke idle?
Thanks again for your help
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