Clues I should've caught are:
-These are stamped with 37162 instead of 746.
-The secondary air jet is 110.
I'm curious about how close these carbs really are, so stay tuned, I'm going to do a side-by-side.
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74-77 KZ400 carb and jet info:
(Credit to Odd Ivar Ibsen - Rest In Peace.)
We're going to do a Kawasaki for a change. I've had this beast forever. It's got a title, so maybe I can make it road-worthy. It still spins, so at least the motor isn't frozen. I found out the front wheel is from a later series. What other surprises lurk? I know it either didn't come with a starter or it was removed.
I'm going to do a complete teardown of these carbs. To install a kit, you don't have to do anything beyond removing the tops and bottoms. But that's too easy. I want to do the entire thing. Who knows what kind of crud lurks inside? Also, I'm curious about leaks around the throttle bars.
Here we see the two sides. On the right is the choke side. On the left is the throttle side.
First thing to do is loosen the screw that holds the choke knob to the choke levers. The screw is circled below.
Choke lever removed. I think I lost a ball bearing. Be careful.
While the carbs are together, I unscrewed the butterfly valves. They slide out the middle of the throttle arms like so:
Butterfly valves out.
Tops off for Harambe. Keep the left side left and the right side right.
I'm going to call these sides 'choke' for the one on the right with the choke lever and 'throttle' for the one with the throttle stuff. The idle screw also connects on the throttle side.
Not sure what purpose these serve, but they're always filthy.
Four screws that hold the plate.
Now they are separated.
I wish to hell I knew where that spring goes.
Choke side parts. Bag 'em.
Close-up of the throttle side parts. Bag 'em.
I wish I knew where that spring goes.
I think it may go on the circled bit. Gonna have to look at an unmolested set to confirm.
Here's the throttle with the bars removed.
The connector bar has a spring and some other crud holding the pins in place.
Starting to get the Fear.
Connector bar assembly.
Throttle assembly removed.
The throttle pivot just unscrews.
An easy way to tell the throttle side carb is the big hole has threads cut into it for the throttle pivot.
Let's look at the bowls. We're in the later stages of the gasoline taffy that collects on the bottom. You know, I've seen worse. The worst is the white powder. That's the final, terminal stage, and it usually eats the aluminum on its way to the grave. And don't tell me it's alcohol in the gas causing it. I've seen it in bikes that were parked in the 60s and 70s, long before gasahol. If you want to bitch at me, save your breath and go tell your representative to stop taking money from the corn lobby. Good #*$@^& luck.
Floats are free. Gonna need some new brass pins.
Nasty.
Viewed like this, the top jet is 60 and the bottom is 110.
There was a lot of hairy crud in the left chamber.
The rods just came right out with a little wiggle.
I have the left one soaking in 50/50 acetone/ATF. the right one is soaking in MMO. We'll see. *Update: the carb that was soaking in 50/50 had no problems getting the jets out. The one soaked in MMO...I may never get the pilot jet out. That said, the one soaked in MMO came out cleaner.
God help us if we have to refer to this:
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