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Fun with carb problems
- ewolpert
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Good news, the bike starts. Bad news, it runs like crap. I am figuring it is a carb issue because at one point I had the mixture screw turned out a good amount and it would idle fine but had zero low end. That is, when you got mid way through the gas it would take off, prior to that it was boggy as hell. I decided to start again with the screws 1 1/2 turns from level, but now it will mostly only idle with choke on and the stupid carbs spit at me, I think it is very rude indeed. Anyhow, I have tried to bench synch the carbs all to no avail. I can read vacuum gauges, but they do not even register an amount ( swings wildly about 0 up to about 20cm Hg). Just for some background, I rebuilt all the carbs so they are pretty clean and also, I am running pods. I did level all of the fuel bowls as well. as usual any advice helps.
Eddie
78 KZ650 b2a
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- ewolpert
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No air box, I have pods on. Thanks for the info on the dampers. I will pick those up. I have a quick question about bench synching. When starting should the screws be all the way in or out or in the middle? I have no idea what the starting position is supposed to be.
Eddie
78 KZ650 b2a
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- davido
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Fun,fun,fun.
good luck
P.S. Im not a mechanic.
www.kzrider.com/forum/11-projects/594313-csr1000-project-build
CB550 (1978)
CB500/4 (1972)*
KZ1000CSR (1981)
XT 600E (1999)
TDM900 (2003)
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- sampeeter
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Thanks for your information on dampers.
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- SWest
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- 10 22 2014
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- baldy110
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- spdygon
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set this way starting rpm was about 2200 and was able to adjust it down.
really you need to check all o-ring ...need to be in good codition so not to loose any vacuum.
i will never use a used set of carbs without a proper cleaning and a complete gasket set.
1982 GS1000sz Katana ( #15...17K Miles)
1982 GS1000sz Katana ( # 297....7100k Miles)
1978 Kz1000 Z1R. 10K Miles1
1978 kz1000 z1r 27k miles
1977 KZ 1000 A ( Project ) 54K Miles
1976 Kz900A4 (Red)21K miles
1976 Kz900A4 ( Red)7500 miles
1974 Z1 900 project
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- ewolpert
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Eddie
78 KZ650 b2a
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- KZB2 650
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baldy110 wrote: Your idle circuits are dirty / clogged.
A good cleaning using Patton's method, a new set of carb holders and turning the air screw out another quarter turn 1 and 3 quarters cured my slight hesitation off idle. I always thought it was something I had to live with since I ran the pods and header but maybe not.
The air adj screw never seemed to do much for me .... might and am 90% sure the cause was the leaking carb holders and or dirty idle circuits.
I tried 1 and a quarter and 1 turn out and it ran worse so I needed it opened up a little. Have a color tune that I havn't used yet and plan on getting it out next year to get em closer.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.
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