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81 KZ750E-2 carbs overflowing. Any suggestions?
- DanAir
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Last time I went to ride the scooter, found that all four carbs were leaking from the overflow tubes a lot, both in the prime position and when running. No leaking when the fuel is shut off by the petcock vacuum.
I have worked on these carbs in the past, and everything has been working perfectly, until this problem.
Any ideas on what is causing this?
Thanks in advance,
DanAir
1981 KZ750E-2
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- BSKZ650
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77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
piglet, leggero harley davidson
SR, Ride captian, S.E.Texas Patriot Guard Riders.. AKA KawaBob
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- Patton
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Imo, the service floatbowl fuel level should be adjusted per FSM specs. The float buoyancy remains the same regardless of fuel level, and the float tang pressure against the float needle (pressing it into the seat) remains fixed. Am thinking the temporary leak abatement was due to something else besides lowering the float level, such as happenstance clearing of the needle/seat interface.
For example, the same inner-tube floats with equal buoyancy regardless of water depth.
Good Luck!
1973 Z1
KZ900 LTD
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- DanAir
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Will try external fixes first, since those rubber air ducts are such a son-of-btch to get back on.
Thanks for your ideas,
DanAir
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- wiredgeorge
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wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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- Patton
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... those rubber air ducts are such a son-of-btch to get back on....
Life's too short to be miserable! :laugh:
Soft and Sensuous
Good Luck!
1973 Z1
KZ900 LTD
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- DanAir
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Put the carb back together. Removed the fuel tank, elevated it, and ran a long fuel line from the tank to the in-line fuel filter. Turned the petcock to prime....no more overlow from the bowls in prime, run, nor reserve, running or not.
Now, I'm happy that there are no overflowing float bowls, but I still don't know what caused this. It may happen again on the road. Yikes.
WG, there are no external hoses on these carbs (CV34's) except the fuel line and the petcock vacuum line on #2.
Forgot to mention that I drained the fuel from the carbs before removing the #4 float bowl. What the hay is going on here? Any ideas?
Thanks for your input,
DanAir
OOPS, Still leaking. Seems to be comming from inbetween the carbs, not the overflow tubes. RATS!! Must need removal and parts. RATS!!
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- Patton
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... OOPS, Still leaking. Seems to be comming from inbetween the carbs, not the overflow tubes. RATS!! Must need removal and parts. RATS!!
Possibly worn o-rings on inlet fuel tee and fuel pipes.
#92055
[Click on image to enlarge view]
1973 Z1
KZ900 LTD
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- DanAir
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The reason I thought it was fixed at first, is the fuel was not flowing from the tank due to a droop in the temporary fuel line. Dumbness!
You could be right. I never separated the carbs when they were off before. Is there a place where these o-rings can be purchased, or does one have to "wing it" with whatever fits? Checked a couple of sites including Z1. They didn't list them.
DanAir
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- Patton
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... never separated the carbs when they were off before. Is there a place where these o-rings can be purchased, or does one have to "wing it" with whatever fits? Checked a couple of sites including Z1. They didn't list them. DanAir
Unfortunately, kawasaki.com parts diagram doesn't include the o-ring size. Might try to match at local hardware or auto-supply store (try for the fuel-resistant variety, "nitrile" as I recall). If unavailable, could try wrapping exising o-rings with teflon tape before reassembly, which is a method successfully used on fuel pipes having the built-in rubberized raised seals without o-rings. Other members have reported the teflon tape seems to hold up very well against the fuel exposure. There are also o-ring supply sources on the web with boo-koos of different sizes and materials.
Good Luck!
1973 Z1
KZ900 LTD
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