Sputters at 0 to 1/8 throttle. Runs great from there up

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30 Oct 2024 16:25 #905609 by Sullivan
78 Ltd 1000. Bike runs great under acceleration but is rough cruising with minimal throttle. Any ideas?
 

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  • Street Fighter LTD
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01 Nov 2024 04:27 #905651 by Street Fighter LTD
Replied by Street Fighter LTD on topic Sputters at 0 to 1/8 throttle. Runs great from there up
Welcome to KZRider Tim
Chances are your carbs need a good cleaning / rebuild.
Also there may be water in the float bowls from sitting 
Dave


Here is my 78 LTD



Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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01 Nov 2024 06:41 #905657 by TexasKZ
Carbs would be my first suspect, too. The pilot jet dominates the mixture at small throttle openings. It is tiny and feeds into several even smaller passageways into the carburetor throat. They can get clogged very easily by dried fuel or bits of debris. When clogged, they will cause the symptom you describe.

Also possible is that one or more of the choke plunger seals have become hard and are allowing fuel to pass even when closed.

Checking spark plugs after letting the engine idle at full temperature for a minute or two (without touching the throttle) may give you a clue as to which problem you have.

FYI--


1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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01 Nov 2024 06:50 #905659 by KeylAmi!
to clarify, the spark plug evidence for dirty pilot circuit would be same as lean(white ceramic)? and the poor sealing choke would be same as rich(black/wet ceramic)?

Current project:
'84 KZ700

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01 Nov 2024 07:20 #905660 by ckahleer
Raising the slide needles may also help.

94 KE100
81 CM200t
82 KZ305
85 VF1100c

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  • Kelly E
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01 Nov 2024 09:44 - 01 Nov 2024 09:50 #905662 by Kelly E
I cheated and installed a set of RS 34's on my 77' KZ 1000 LTD. Now it runs like a scalded dog.

The Rust Bros. Garage Collection
1974 Honda CB 550 K0
1975 Honda CB 400F Super Sport
1977 Kawasaki KZ 1000 LTD
1980 Suzuki GS 1100E
1982 Honda CB 900F Super Sport
1983 Honda CB 1100F
1984 Honda Sabre 700
1984 Honda Interceptor 1000
1990 Moto Guzzi 1000
1994 Kawasaki ZG 1000 Concours

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Last edit: 01 Nov 2024 09:50 by Kelly E.

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02 Nov 2024 15:24 #905699 by Sullivan
Thank you, what a beautiful bike you have there. I’ll be taking things apart next week. Have a leaking rear master cylinder as well so I have a little work to do. This bike has been sitting for 10 years so I’m sure I’ll find many other problems. 
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03 Nov 2024 06:39 - 03 Nov 2024 06:49 #905729 by TexasKZ

to clarify, the spark plug evidence for dirty pilot circuit would be same as lean(white ceramic)? and the poor sealing choke would be same as rich(black/wet ceramic)?
Yes. An infrared temperature gun might also be helpful, especially in identifying which cylinders are struggling. Since the bike has been sitting so long, the brake system needs to be completely rebuilt. The fluid will have a lot of water in it and all of the rubber bits will have deteriorated. Completely clean and rebuild both master cylinders and all the calipers. Replace the brake hoses, preferably with braided lines. Replace brake shoes if needed. I would replace them no matter how nice they look since the friction material is bonded to the backing plate and that bonding agent may deteriorate over time. Brakes should not be cheaped out.
Ten year old tires need to be tossed as well.
Next, I would carefully clean the entire fuel system and replace the rubber hoses there, too. Carefully inspect the carb holders. If they are really hard and showing surface cracks, replace them as they are likely leaking, or will be soon.
Finally, do all of the routine maintenance required by Kawasaki. 
When you are finished, you will have a reliable machine that operates as Kawasaki intended.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
Last edit: 03 Nov 2024 06:49 by TexasKZ.
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