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Author Topic: 550 K1 - 2way fuel petcock  (Read 542 times)

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Offline Erny

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550 K1 - 2way fuel petcock
« on: March 27, 2020, 09:13:58 AM »
Since beginning I have this bike I have issue with petcock
1. original 2-way leaks... despite I tried to clean it, it does not help. I suspect problem comes from "worn"  plastic cone (or hardened). This is impossible to find as spare...
2. Aftermaket 2-way one from 4into1 - I ordered one, it leaked, claim it back, got replacement, but it is leaking too...
3. Honda OEM 1-way (16950-341-671 https://www.cmsnl.com/products/cockfuelcb750k5_16950341671/#.Xn5G4IhKiMo) - this does not leak, but issue is to have proper split 1to2 fuel lines under tank, there is very limited space. I don't like it. I tried to replace cone from new 1-way into 2-way but it leaks again (probably bit different shape or worn body of old 2-way petcock).
4. New OEM 2-way - some available at ebay, but sky high prices :(

Does anyone have idea where to find just plastic cone to be used inside OEM petcock?
Or, other alternative (2-way) that does not leak?

« Last Edit: March 27, 2020, 11:33:21 AM by Erny »
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CB550K1 USA model (1975)

Offline bryanj

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Re: 550 K1 - 2way fuel petcock
« Reply #1 on: March 27, 2020, 10:20:55 AM »
If this is the type that screws onto a threaded bung on the tank seperate internal parts have never been available.
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline Erny

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Re: 550 K1 - 2way fuel petcock
« Reply #2 on: March 27, 2020, 11:36:12 AM »
Yes, it is the one
« Last Edit: March 27, 2020, 11:40:41 AM by Erny »
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Offline bryanj

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Re: 550 K1 - 2way fuel petcock
« Reply #3 on: March 27, 2020, 11:46:50 AM »
Then sorry its complete or nothing im afraid
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Erny

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Re: 550 K1 - 2way fuel petcock
« Reply #4 on: March 27, 2020, 12:02:14 PM »
Yes, that is also my conclusion... but still looking for alternative one that does not leak
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Offline Deltarider

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Re: 550 K1 - 2way fuel petcock
« Reply #5 on: March 27, 2020, 01:02:11 PM »
Maybe, I don't understand, but there is the strainer set: 16952-341-671
and even the O-ring: 16997-467-000.
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Offline Erny

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Re: 550 K1 - 2way fuel petcock
« Reply #6 on: March 27, 2020, 01:07:20 PM »
It leaks via body, strainer and gasket is ok.
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Offline Erny

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Re: 550 K1 - 2way fuel petcock
« Reply #7 on: March 27, 2020, 01:07:57 PM »
I mean when it close tap, fuel keeps dropping via output
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Offline Scott S

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Re: 550 K1 - 2way fuel petcock
« Reply #8 on: March 27, 2020, 01:27:05 PM »
 Been there, done that. Spend the money and get the genuine Honda.
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Offline Erny

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Re: 550 K1 - 2way fuel petcock
« Reply #9 on: March 27, 2020, 01:46:20 PM »
Just did another try using T joint and 1 way OEM petcock (only one I have and is not leaking). Hope fuel will flow...
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Offline Stev-o

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Re: 550 K1 - 2way fuel petcock
« Reply #10 on: March 27, 2020, 02:38:49 PM »
Quote from: Scott S on March 27, 2020, 01:27:05 PM
Been there, done that. Spend the money and get the genuine Honda.

+1.  Cheap ass parts end up costing more in the long run as they will need to be replaced.
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Offline Bodi

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Re: 550 K1 - 2way fuel petcock
« Reply #11 on: March 27, 2020, 03:59:48 PM »
This type seals in an odd way with the conical plastic turning part against the alloy conical hole in the body. I have a single outlet one (everything is dual outlet except the body is not drilled for the second nipple).  I had a drip, and used fine valve lapping compound then twisted the cone in the hole followed by rouge powder in oil. Stopped the dripping. The spring washer under the lever retainer is vital, there needs to be some force on the cone to push it in and seal: the spring can kinda flatten out and lose tension, gentle bending into a deeper S-curve with needlenose pliers will get more tension. I also used some O-ring lube to make it smoother turning and to add to the sealing.
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Offline Erny

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Re: 550 K1 - 2way fuel petcock
« Reply #12 on: March 27, 2020, 05:05:17 PM »
That is exactly my plan as next - lapping compound.
But now, all shops nearby are closed, so need to wait
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