Author Topic: Petcock leak  (Read 816 times)

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Offline acollin

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Petcock leak
« on: December 11, 2013, 12:41:05 PM »
1974 cb 750 all stock

My petcock appeared to be leaking and overfilling the float bowls. I had another new--still in the wrapper packing washer -- the 4 hole kind. I replaced the packing washer and the leak is now worse. It now leaks outside the petcock from the lever area. -- right where I put the new packing washer. Before the leak was only inside the petcock.

I cleaned the mating surfaces and there does not appear to be any special way to fit things that I know of or can see.

Don't you just love it when you try to fix one thing and something else jumps up.

Please advise-- thanks in advance for your help.

Offline flybox1

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Re: Petcock leak
« Reply #1 on: December 11, 2013, 01:29:22 PM »
fuel resistant pipe (teflon) tape.
works great if you're leaking at the threads.
replace any o-rings or seals with new viton or buna rings.

'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline ekpent

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Re: Petcock leak
« Reply #2 on: December 11, 2013, 01:53:55 PM »
Sure you put it back together correctly and did not put the wavy washer in the wrong spot ?

Offline acollin

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Re: Petcock leak
« Reply #3 on: December 11, 2013, 02:17:44 PM »
Ekpent gets the prize.

I came back in and studied the parts books-- which I should have done before i panicked and ran to the forum.

Wavy washer in the wrong spot. When I took it apart, it sort of all sprung off-- I put it back in a way that looked right but did NOT make any sense-- wavy washer should be placed next to a flat surface that would not flex.

This forum is like a good drug-- the problem is the good drug and the forum works. I should have gone back to the book first.

Sorry for the alarm and grateful for the help.

Offline ekpent

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Re: Petcock leak
« Reply #4 on: December 12, 2013, 10:37:49 AM »
Been there done that also with the "wavy' washer  :D

Jay Ace

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Re: Petcock leak
« Reply #5 on: December 12, 2013, 11:16:28 AM »
I have NEVER put that washer in the wrong spot ... EVER ...  :P