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nasty varnish
- Seen172
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- bountyhunter
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If it is excessive, it's possible the petcock is not sealing well and some gas continues to seep and ends up in the intake bore due to gravity. It can oxidize there and form that brown varnish.
As long as the carbs are clean where they need to be, I don't think it hurts anything. If I have the carbs apart, I usually hose them with gumout spray to take it off.
1979 KZ-750 Twin
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- MFolks
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Some people have used Lemon Juice for the boil but I've read the carb bodies get a dull finnish from this.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- TeK9iNe
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Some people have used Lemon Juice for the boil but I've read the carb bodies get a dull finnish from this.
Yessir.
Motorcycle Shop Owner/Operator
79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors
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- Seen172
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- Patton
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So I have everything all cleaned up again. Sound like it is running better now. I have been fighting cylinder 3, it doesn't like to fire all the time. I spray water on the head pipes and it takes a minute to evaporate, while the other three are instant. I have good spark, but noticed that fuel was sitting at the boot on my pod and the filter was soaked with fuel after it was warm and run around the block a few times. Could it be blowing back through the intake valve a little bit?
Might be leaking float valve and/or too high fuel level.
Would sniff-test crankcase oil to detect possibility of fuel contamination.
Good Fortune!
1973 Z1
KZ900 LTD
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- Seen172
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- nicksorg
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Thanks
Nick
1982 Kawasaki KZ1000-K2
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- Patton
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I rebuilt the carbs, and set the float levels. Everything is all nice and clean too. I even dropped the float a tiny bit more to see if it helps any, and it still does it..
If not already done, would verify fuel level inside float bowl by performing the clear tube test, which test is imo the best way to determine for sure the actual true fuel level.
The important consideration is not "float height."
The important consideration is "fuel level."
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1973 Z1
KZ900 LTD
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- Seen172
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- bountyhunter
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First thing is to always check compression and valve clearance. A valve with no clearance will cause blowback.So I have everything all cleaned up again. Sound like it is running better now. I have been fighting cylinder 3, it doesn't like to fire all the time. I spray water on the head pipes and it takes a minute to evaporate, while the other three are instant. I have good spark, but noticed that fuel was sitting at the boot on my pod and the filter was soaked with fuel after it was warm and run around the block a few times. Could it be blowing back through the intake valve a little bit?
1979 KZ-750 Twin
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- Patton
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...The clear tube test was good, everything is sitting where it should be....
When fuel is rising up into the carb throat, the clear tube test will indicate a fuel level higher than the requisite 2~4mm below the float bowl gasket.
Am thinking problems are due to yet unresolved issue(s) with the float valve and/or float. And that the non-combusting cylinder is "flooding out."
Good Fortune!
1973 Z1
KZ900 LTD
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