confounded float level

I have an '82 kz750n cv carbs some model of kehin carbs. I need instructions on how to access the "filebase" for detailed instructions about the clear tube method.
I've gotten too many headaches from petrol fumes to keep doing this.
I have a jig to level and plumb the carbs even though the carbs tilt forward on the bike.
The official shop manual says 3-4mm below the carb body. I get contradictory, wildly varying levels after each round of bending.
I've blown in the fuel delivery hose while they're upside down to get an even height from the point where the float needle no longer allows air to pass.
I've bent the clear hoses to allow a minimal amount of air to get trapped in the clear tube, I've run lots of fuel through an airbubble-less clear tube to equalize the level and pressure upstream and downstream of the float needle.
will two more weeks of the summer pass while I pay someone to do this for me?

thanks for your attention to my question about a referral on how to use the "filebase"

joe* wrote: I have an '82 kz750n cv carbs some model of kehin carbs. I need instructions on how to access the "filebase" for detailed instructions about the clear tube method.
I've gotten too many headaches from petrol fumes to keep doing this.
I have a jig to level and plumb the carbs even though the carbs tilt forward on the bike.
The official shop manual says 3-4mm below the carb body. I get contradictory, wildly varying levels after each round of bending.
I've blown in the fuel delivery hose while they're upside down to get an even height from the point where the float needle no longer allows air to pass.
I've bent the clear hoses to allow a minimal amount of air to get trapped in the clear tube, I've run lots of fuel through an airbubble-less clear tube to equalize the level and pressure upstream and downstream of the float needle.
will two more weeks of the summer pass while I pay someone to do this for me?

thanks for your attention to my question about a referral on how to use the "filebase"

how to use the "filebase"


Here's how to search for an article on some particular topic in KZrider's FILEBASE.

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Scroll through the articles to find a topic of interest, such as

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And click on the "Download" button to view the article.

This link goes directly to the specific article about Keihin CV carbs:
Click here > www.kzrider.com/filebase/doc_download/47...-shop-manual-via-omr

In this particular article, I didn't notice much about using the clear tube test to determine actual fuel level inside the carb float bowl.

Good Fortune!

The carb is designed to best perform with a certain specified level of fuel inside the float bowl.
A too high fuel level results in an excessively rich mixture throughout the throttle range.
A too low fuel level results in an excessively lean mixture throughout the throttle range.

The objective of the CLEAR TUBE TEST is to determine height of fuel level inside the float bowl.
When the test is performed correctly, the level of gasoline visible inside the tube will match the level inside the float bowl.

Carb must remain in a stable level position during the test, such as motorcycle on centerstand or otherwise held steady in a balanced level position. Or carbs may be held level on the workbench.

First -- prevent gasoline supply to the carb, and then drain the float bowl.
Which leaves an empty carb with a dry float bowl.
Next, attach the clear tube and hold it steady alongside the carb.
Then, allow gasoline to enter the carb.
The incoming gasoline passes through the float valve and into the float bowl.
As the level of gasoline rises inside the float bowl, the level of gasoline also rises inside the clear tube.

If the float valve is correctly functioning, the float will rise high enough to close the float valve, at which time gasoline stops entering the float bowl, and remains at a fixed level inside the float bowl and at the matching level visible inside the clear tube (either too high or too low or within specs).

Learning the actual fuel level inside the float bowl completes the clear tube test.
If the fuel level is too high or too low, "adjusting" the fuel level is a separate procedure, which involves changing how soon the rising float stops gasoline flow through the float valve.

Good Fortune!

Some carb designs have nipple from bottom of float bowl that serves dual purposes as both over-flow and drain. Clear tube may be simply attached onto the nipple.

The "drain" function is used when clear tube testing -- NOT the "overflow" function.

A time-saving tip is to use only a single screw to hold the float bowl onto the carb during the clear tube test, which makes it easier and faster to r&r the bowl between tang adjustments.
Likely won't leak at all, but minimal leakage through the gasket area won't invalidate results of the clear tube test (as fuel volume entering the bowl exceeds any leakage).

When gasoline fumes get bothersome while clear tube testing between float height adjustments, I have used common household rubbing alcohol instead of gasoline. The slightly heavier alcohol won't significantly affect the float buoyancy.

Good Fortune!

Patton wrote: Some carb designs have nipple from bottom of float bowl that serves dual purposes as both over-flow and drain. Clear tube may be simply attached onto the nipple.

The "drain" function is used when clear tube testing -- NOT the "overflow" function.....

Don't know whether the Keihin CV carbs at hand have a "dual purpose" drain screw function.

On carbs that do have a dual purpose drain screw function, the drain screw in its normally tightened position allows the overflow circuit to function, whereby excess gasoline is supposed to discharge from the float bowl nipple (usually through an attached hose routed to exit an expel gasoline underneath the bike).

Loosening -- not removing -- the drain screw allows the "drain" to function, whereby the float bowl may be drained dry.
It's this "drain" function that's used in the clear tube test.
Thus, on carbs having the dual function drain screw, the screw must be loosened in order to perform the clear tube test.


Good Fortune!

wrong info my error

Thanks for your efforts. Looks like the filebase is only for logged on users. Thanks.

Any input on the practice of filing off the indentation on the tang where the spring loaded stub sticking out of the barrel of the float needle hits the tang?

any input on how I can get different levels after each refilling of the carbs without having bent the tangs?

does air bubbles in the tube invalidate the measure? How much air invalidates it? How do you get air out of the tube? Is my in line fuel filter significantly slowing the flow of fuel into the bowl causing air bubbles?
I'll go to the filebase now.


Thanks again.

anyone suggesting search terms?

I've tried:
set richness
set fuel height
set fuel
float level
float
clear tube
float bowl
cv

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If dual purpose drain screw --
When clear tube testing, the drain screw must be "loosened," but not removed.
"Loosening" enables the drain function.
When tight, the overflow function is operative.

If single purpose drain screw --
Remove screw and insert clear tube.
The float bowl nipple serves only as overflow, not drain.




Good Fortune!