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Gas in oil
- pdriscol
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After some research, I suspected faulty petcock. Mine is a vacuum assisted petcock. So, I removed the fuel line. With the petcock set to ON, no fuel flowed until I rocked the tank a little, and a couple drops of gas came out. I then removed the vacuum line, and took the tank off. Currently, no gas flows freely, but if I let the tank sit, then pick it up and slosh the remaining gas back and forth, a few drops will leak out.
I was expecting gas to flow freely from the petcock, if the petcock was in fact the culprit. I guess my question is this: Are these few drips here and there enough to get gas down into the crankcase and mix with the oil, or do you guys think there might be other suspect factors?
Any suggestions would be helpful!
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- KZQ
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- Walking Behind the Corn May Not Be All That!
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That depends. Do any of the carbs leak or drip after you've just finished a trip?
I've never had much luck rebuilding a petcock. If you're not really a stickler about OEM parts, I suggest anything made by Pingle. They're still made in the USA, believe it or not. I just plug off the vacuum line to the petcock. A lot of these old Kaws have fuel system problems because many of the old parts are made from real rubber, which is softened by alcohol.
I'm still trying to find out why the Govm'nt thinks it's better to burn alcohol than drink it. Most likely, if I ever do find the answer, they'll kill me.
KZCSI
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1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
Projects:
1985 ZN1300
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- wiredgeorge
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Why is the bike mis-firing? Have you checked compression yet? Have you adjusted the valves? Checked coil voltages? ANY of these things will produce lousy combustion as will old tired coils or bad ignition wires/caps.
If your vacuum diaphragm in the petcock is compromised, you can certainly drool extra gas but this will flood the combustion chambers when the bike is sitting and not while it is running. When running, a healthy bike will just burn the gas supplied which is being metered by the float seat/valve. If you want to test the petcock, put a jar under it while the vacuum hose is disconnected. If you get a few drops, this won't foul the oil. I suggest you look at tuning the bike up and a good way to start is to buy a shop manual and also look at diagnosis tools like a compression tester and a multimeter.
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
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- pdriscol
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"...do you guys think there might be other suspect factors?"
That depends. Do any of the carbs leak or drip after you've just finished a trip?
Nope. No leaks anywhere.
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- pdriscol
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I suggest you look at tuning the bike up and a good way to start is to buy a shop manual and also look at diagnosis tools like a compression tester and a multimeter.
I'll get on this. Thanks.
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- mtkawboy
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78-KZ1000/1105, 80 KZ1000, 82 Kawasaki GPZ750, 95 Harley Fatboy, 80 Suzuki GS1100ET, 81 GS1100E parts bike, 83 GS1100SD Katana/1394,78 Yamaha XT500, 81 Yamaha XS650, 78 Yamaha XS650E, 48 Whizzer model J motorbike, 71 Honda CT70H, 71 Honda CT70, 81 IT 250 Yamaha,82 Honda XL100S owned
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- Locozuna
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KZ900LTD, KZ750LTD, KZ650, 72'Triumph Trident
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- Bluemeanie
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1980 KZ650F1, Bought new out the door for $2,162.98!
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