"Care And Feeding Of The CVK40" - Kawasaki KLR 650 Forum
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post #1 of 21 Old 06-29-2015, 03:11 AM Thread Starter
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"Care And Feeding Of The CVK40"

If there's a moderator within the sound of my keyboard, this link should be stickied, IMHO:

Care & Feeding Of The Keihin Carb

This primer on the CVK40 (and generally, all CV carbs) has bounced around from elusive, and sometimes obsolete, websites; recommend keeping track of the link, perhaps prudently printing out the article.

Content is profound; I'm not kidding (now, though I often am!).

Four video clips on the KLR650 carburetor, the Keihin CVK40:






Last edited by Tom Schmitz; 12-06-2018 at 02:54 PM. Reason: Added Videos
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post #2 of 21 Old 06-29-2015, 04:02 PM
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I got some learning to do, but thanks for posting this. Super informative already.




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post #3 of 21 Old 06-29-2015, 05:09 PM
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I had a link to that article in one of my videos and was advised that the link was dead a couple of days ago. Found the new source and put that in the video, but just to be on the safe side I made a .pdf out of it and saved it.

As Damocles says, it's been bounced from pillar to post in the past 15 years.

Tom
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File Type: pdf Care & Feeding Of The Keihin Carb.pdf (1.34 MB, 72 views)
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post #4 of 21 Old 01-09-2016, 04:37 PM
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This "Care and Feeding of the CVK40" article is very good, but I found a small error.

"Pilot System-Steering you to better lows" The very last sentence.

The pilot mixture screw Primarily controls Fuel not air.
So opening the screw richens the idle mixture.

Yea, I know, pickey, pickey, pickey.
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post #5 of 21 Old 01-09-2016, 05:34 PM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
This "Care and Feeding of the CVK40" article is very good, but I found a small error.

"Pilot System-Steering you to better lows" The very last sentence.

The pilot mixture screw Primarily controls Fuel not air.
So opening the screw richens the idle mixture.

Yea, I know, pickey, pickey, pickey.
My understanding, the idle mixture screw meters air/fuel mixture at idle.

Yet, the Kawasaki nomenclature for the screw (Fiche Reference 16014) is, "SCREW-PILOT AIR."

For discussion, I copied the last sentence in the "Care and Feeding" article:

"When you adjust the pilot screw that's under the carb, you are varying the amount of air premixing with the gas before it enters the venturi."

Generally, a pilot screw on the intake side is an "air" screw; on the engine side, a "fuel" screw.

Again, I thought the CVK40 idle mixture screw controlled the flow of a mixture of air and fuel from the pilot jet to the venturi; backing the screw out fuel-enriched the idle mixture, or so I thought.

Last edited by Damocles; 01-09-2016 at 05:41 PM.
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post #6 of 21 Old 01-09-2016, 06:10 PM
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Quote:
Originally Posted by pdwestman View Post
This "Care and Feeding of the CVK40" article is very good.

The pilot mixture screw Primarily controls Fuel not air.
So opening the screw richens the idle mixture.
Quote:
Originally Posted by Damocles View Post
My understanding, the idle mixture screw meters air/fuel mixture at idle.

-------- backing the screw out fuel-enriched the idle mixture, or so I thought.
Did we not just say the same thing?

I will suggest at this point, the throttle plate and Large idle speed screw Primarily control the low speed air supply.

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post #7 of 21 Old 01-10-2016, 02:03 AM
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I thought this one was "stickied".

One of us ought to be able to glue it to the top.

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post #8 of 21 Old 01-10-2016, 02:04 AM
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Not seeing it in my options.....

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post #9 of 21 Old 01-10-2016, 06:42 AM
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Quote:
Originally Posted by CheapBassTurd View Post
I thought this one was "stickied".

One of us ought to be able to glue it to the top.
This one shows as stickied already for me. Good article with lots of info!
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post #10 of 21 Old 01-10-2016, 08:32 AM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
Did we not just say the same thing?
Semantically, I think, not exactly, Paul!

At issue: Does the idle mixture screw regulate fuel flow only, air flow only, or . . . an emulsified mixture of air-and-fuel?
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