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Cylinders 2 and 3 running rich
- JDRAKE4200
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Keep the shiny side up!!!!
1976 KZ900 LTD
2004 Sportster 1200 Custom
1981 KZ550 LTD
1994 GSXR 750
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Nessism
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- SWest
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- 10 22 2014
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Steve
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- jdvorchak
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Not saying that is what your problem is but I point it out to let you know that just reading the plugs is not always an accurate test. Always do more than one test before making a decision on a course of action. Next thing I did was run a compression test and found all 4 with good compression and all very close to 150 PSI. Then I checked for strong spark. Only then did I try to drain the bowls to measure the qty in them.
Don't fix it until it's broken.
John
83 KZ550M1
83 KZ1100LTD
Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar
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- JDRAKE4200
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Stock air box with k&n filter. Air intake enlarged
Vance and Hines 4-1 with baffle
Air screw on bottom of carbs behind bowls
Dyna 3 ohm coils
Dyna electronic ignition
Swest, what connection do you think is bad?Coils are good.
Keep the shiny side up!!!!
1976 KZ900 LTD
2004 Sportster 1200 Custom
1981 KZ550 LTD
1994 GSXR 750
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- JDRAKE4200
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Keep the shiny side up!!!!
1976 KZ900 LTD
2004 Sportster 1200 Custom
1981 KZ550 LTD
1994 GSXR 750
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- JDRAKE4200
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Keep the shiny side up!!!!
1976 KZ900 LTD
2004 Sportster 1200 Custom
1981 KZ550 LTD
1994 GSXR 750
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- SWest
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Steve
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- jdvorchak
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Just for a sanity check make sure all of the boots are on the carbs good and the insulator bands are tight. I'm really reaching for straws here.
This is a tough one .. I wish you good luck.
Don't fix it until it's broken.
John
83 KZ550M1
83 KZ1100LTD
Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar
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- ajsfirehawk
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79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
Z900RS
23 Mach 1
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- Patton
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JDRAKE4200 wrote: So I finally got the bike together and took it for a 1-2 mile test ride. Got her home, let the engine cool and pulled the plugs. Cylinders 2 and 3 are very rich as they are black and sooty. They were not wet. They were dry. Plugs were clean before the ride. Cylinders 1 and 4 look good. Floats are set correctly. Carbs were pulled (26's with fuel s screw behind the bowls) off during the build and the only thing I touched other than cleaning the bowls and jets, were the fuel mixture screws behind the bowls. They were all over the place so I set them at 2 turns out. Should I turn the screws in a turn and see what they look like after a ride? Please help as I am stumped.
If it's a side-located pilot air screw, turning it in clockwise reduces air which further enrichens the mixture.
Two turns out is probably far enough out when carbs are in perfect condition.
Would use brand new B8ES plugs and visibly inspect the spark quality on removed plugs while cranking the engine.
Compare with spark quality produced by the other plugs.
Fat blue sparks are evidence of a strong ignition system.
If the plugs produce fat blue sparks, but are getting dry-sooty anyhow, would then assure that valve clearances are within specs on both of the "too rich" cylinders. Compression test alone is insufficient, because too tight valve clearances may not cause loss of compression until the engine attains normal operating temperatures.
If spark quality and valve clearances and compression are all acceptable, would then address possible carburetion issues.
Floats are set correctly -- is this evidenced by clear tube testing?
Good Fortune!
1973 Z1
KZ900 LTD
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