1983 KZ750 F1 Carbs driving me crazy!

Wookie58 wrote:

Paulkx5 wrote:

Wookie58 wrote:

Have you tried blowing with your mouth and a piece of pipe as they fill with the bowls on (it appears all the testing so far has been with the bowls off)

If I am following your question correctly, I have not done that. Are you saying to blow into the black plastic tee fitting vent?

No, once they are full, disconnect the fuel line and connect a hose to the fuel T on the carbs which you can then blow in gently (any that aren't seating will allow you to blow fuel out of the clear tubes used for checking float height) I don't know how else you could simulate "real world" with them on the bike

Thank you for the clarification. I will try and do that tonight along with grabbing a video.

Nessism wrote:

P1030291 by nessism , on Flickr

P1020761 by nessism , on Flickr

Again, if your carbs have the tube in the float bowl, make sure the brass isn't cracked.  I've rebuilt a LOT of these carbs, and most sets have at least one tube cracked, causing automatic overflowing.


 

Those look amazing! I thought mine looked good after hitting the ultrasonic. 

I will double check those tubes. Thank you.

 

chopper1963 wrote:

OK, so this bike is the Kawasaki KZ750 LTD, correct?

Yes. 1983 KZ750-F1 (I believe this is correct) it is an LTD with the shaft drive. Overall in very nice shape except for mismatched paint which if I ever get it running correctly, I will be painting it seductive blue ASAP. I actually bought the bike for my girlfriend.

asphalt900 wrote:

Leaking thru the bottom of bowl, thru overflow barb can also be caused by plugged-up carb casting vents.

The only time I have fuel coming out of the bowl drain is when I have the drain plug open. I have been using clear tubes on the drains to figure out what is going on with the leaking. If the drains are shut, the two carbs will just overflow out of the carb inlets (airbox side). 

Do you think a plugged vent somewhere could be causing the overflow issue? I have to admit I am not real familiar with the CV34 carbs on this bike.

To the best of my knowledge the fuel level can only get that high if the float valve isn't closing

Wookie58 wrote:

To the best of my knowledge the fuel level can only get that high if the float valve isn't closing

That knowledge helps a lot more than you may realize. I have a plan to recut the float valve seats if needed, or even replace them if that is what it takes. It has had me chasing my tail for months and I am afraid that I am missing something while trying to nail this down. If there is no other route for the fuel to come into the carbs other than the needle / seat, I will find a way to fix them.
Thank you!