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Author Topic: Petcock drips gas in stop position, WHY?  (Read 1235 times)

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Offline njcafe84

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Petcock drips gas in stop position, WHY?
« on: May 27, 2010, 02:20:38 PM »
My petcock will drip gasoline from one of the valves when its in the stop position and I cant seem to figure out why or how to fix it. Please any insight?
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Offline cb750k77

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Re: Petcock drips gas in stop position, WHY?
« Reply #1 on: May 27, 2010, 02:22:58 PM »
needs a new O-ring gasket its like a 5$ part from honda depending on the year!
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CB750k77 rebuilt (almost)

Offline TwoTired

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Re: Petcock drips gas in stop position, WHY?
« Reply #2 on: May 27, 2010, 03:22:25 PM »
There are at least four different fuel valve designs on the SOHC4.
How's that for insight?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline njcafe84

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Re: Petcock drips gas in stop position, WHY?
« Reply #3 on: May 27, 2010, 03:44:01 PM »
My bike is a 1972 cb500
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Offline TwoTired

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Re: Petcock drips gas in stop position, WHY?
« Reply #4 on: May 27, 2010, 05:17:14 PM »
Then you need one of these...
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline vames

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Re: Petcock drips gas in stop position, WHY?
« Reply #5 on: May 27, 2010, 06:11:31 PM »
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Offline JBMorse

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Re: Petcock drips gas in stop position, WHY?
« Reply #6 on: May 27, 2010, 06:14:10 PM »
Quote from: vames on May 27, 2010, 06:11:31 PM
http://forums.sohc4.net/index.php?topic=71260.0
This post refers to the problem I discovered: that the sealing washers on the screws that hold the petcock on were bad.  Initially I had purchased a petcock seal, and was puzzled when the dripping didn't stop.  Don't buy just any rubber washer for those mounting screws.  I learned the hard way that gas will eat through your standard hardware store washers, so I sprung for Honda washers at nearly $5 each!
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1971 CB500K

Offline Spanner 1

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Re: Petcock drips gas in stop position, WHY?
« Reply #7 on: May 27, 2010, 08:24:03 PM »
OP instantly scared away by instant responses, c/w photos.....all within 4 hrs.!
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If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline camelman

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Re: Petcock drips gas in stop position, WHY?
« Reply #8 on: May 28, 2010, 01:52:42 AM »
My pet cock... hahahahahahahahahah!
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1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline MaaseyRacer

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Re: Petcock drips gas in stop position, WHY?
« Reply #9 on: May 28, 2010, 11:14:02 AM »
Quote from: camelman on May 28, 2010, 01:52:42 AM
My pet cock... hahahahahahahahahah!

If yours is leaking penicillin might just do the trick.
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1961 CB72
1961 CB77
1962 CB77
1962 CB77
1965 CB160
1970 Triumph Bonneville
1972 Honda CB450
1975 Norton Commando
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