New Mikuni Pumper Carb Kit For KLR - 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 28 Old 03-27-2013, 09:27 PM Thread Starter
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New Mikuni Pumper Carb Kit For KLR

EDIT: Carb offered appears to be a VM38, 38-mm venturi "round slide" carburetor (from post on another forum). Did not verify presence of an accelerator pump when I titled the thread.

Just FYI; Arrowhead today posted a Mikuni carb kit for KLR application (click on, "NEW PRODUCTS"):

http://www.angelfire.com/ut/moab/parts_frames.html

No experience; no advocacy; only . . . FYI!

(Consumer on another forum posted improved throttle response, no noticeable increase in power; I'm sure, if asked, he would say . . . YMMV!)


Last edited by Damocles; 03-28-2013 at 06:47 AM.
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post #2 of 28 Old 03-28-2013, 12:14 AM
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Too bad he has to be so secretive about the details.

Do you suppose it is a 38mm or 44mm?

T

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post #3 of 28 Old 03-28-2013, 12:21 AM
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We use 2 of those carbs on the CX500 and 650's, they are the same size from what I have learned from our forum.
Just adding a pumper carb from my exerience will only increase the throttle responce if you just add it to a stock engine. Add it to a fully modded engine and it's a completely different story.

From personal experiences....

Willys
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post #4 of 28 Old 03-28-2013, 12:39 AM
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That doesn't compute. I should think that either a 38 or 44 would be way too much carb for a 250cc jug. Something in the low 30s would be more appropriate, and that would seem too small for the klr.

Also don't understand your comment about a direct pull pumper carb not offering good throttle response on anything but a stock engine. Doesn't make sense. If not a direct pull, then what?

Don't understand what is special about a 'modded' engine that a direct pull pumper won't do justice to.

T

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post #5 of 28 Old 03-28-2013, 12:51 AM
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Tom...reread my post.....I said it will only increase the throttle responce on a stock engine and give much more on a modded engine. I never used the word "NOT"...?
Those carbs are used on the CX500 and CX650 or GL650 bike as a hop up mod and work extremely well.

Willys
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post #6 of 28 Old 03-28-2013, 01:34 AM
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Going the other way doesn't make sense, either. How can a carb work exponentially?

38mm or larger carbs on a 250 jug? OK.

T

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post #7 of 28 Old 03-28-2013, 06:27 AM Thread Starter
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Quote:
Originally Posted by Tom Schmitz View Post
Too bad he has to be so secretive about the details.

Do you suppose it is a 38mm or 44mm?

T
This just in! Consumer says (another forum) the Arrowhead offering is a VM38, 38-mm venturi round slide carb.

Further, I assumed the carb offered has an accelerator pump; unfamiliar with the product myself, I can't tell from the image whether the carb shown is a pumper or not.

From available information, the kit appears rather "plug 'n' play," KLR-wise, with a vacuum port if needed for a stock fuel tank petcock.

Again, my window into this world is the vendor's website and a consumer's post on another forum, no personal observation or experience with the product.

Last edited by Damocles; 03-28-2013 at 06:43 AM.
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post #8 of 28 Old 03-28-2013, 07:13 AM
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Does a Mikuni have the same pump design as a Keihin pumper? I have an FCR39 on my DR and a CVK40 pumper on my KLR. Both are basically a rod pushing a diaphragm that pumps gas only when the throttle is twisted.
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post #9 of 28 Old 03-28-2013, 12:09 PM
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In truth, the Mikuni VM is not a pumper carb (unless my geriatric memory fails me).

The Mikuni TM is a pumper, and a flatside.

How well does the Keihin pumper work on your KLR? What difference did you note?

T

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post #10 of 28 Old 03-28-2013, 12:59 PM
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The TM40 is another one that is used on the DR. I'm not familiar with the VM.
I'm still playing with jetting and air on the CVK. As it is now it's SO smooth in the lower range and putting around yet when I pop the throttle the pump/squirt is obvious. Still a lot to learn on the setup.
Sorry for getting off the original subject,just answering a question.
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