Author Topic: O Ring source for fuel use-petcock-CB550K  (Read 1613 times)

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Offline denward17

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O Ring source for fuel use-petcock-CB550K
« on: April 23, 2025, 03:55:06 PM »
My 550 fuel petcock started leaking around the handle, so I ordered a new petcock from 4into1.  Not my regular vendor choice but the only one I could find.

Guess what, the new one leaks in the same area.

I took my old one apart, simple device.  It has a 2mm X 19mm o ring behind the petcock handle that swivels from on/off/res.  I assume that is the reason it is leaking.

Online I found the oringstore and put in an order for 2mm X 19mm, 2.5mm X 19mm and 2.4mm x 18.6mm.  These were the closest that I could find, will decide which one to use if I ever get them, they are back ordered.

Does anyone have a good source for metric o rings?

Offline HondaMan

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #1 on: April 23, 2025, 05:27:30 PM »
Honda sells a petcock rebuild kit for those bikes, if it has the OEM petcock: #16952-341-671

(Also in Chapter IV, Page 13. :D ).
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #2 on: April 23, 2025, 07:23:49 PM »
Honda sells a petcock rebuild kit for those bikes, if it has the OEM petcock: #16952-341-671

(Also in Chapter IV, Page 13. :D ).

I'll check my new book  ;)

But looking at SSH parts fiche, it indicates the body and the whole petcock is no longer available, and you cannot buy a rebuild kit for the body.

Part #4 highlighted in pic., with the o ring I need in yellow.

16951-374-671
BODY SET, PETCOCK (NOT AVAILABLE)

Offline HondaMan

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #3 on: April 24, 2025, 08:11:10 PM »
I found a kit on eBay:
https://www.ebay.com/itm/226233476688

It might be discontinued again, but there's a zillion of them out there. With Honda's parts, whenever the last 3 digits become -670 (or nearly anything "6xx") it indicates that Honda has stopped stocking it (again) and it has been turned out to the vendors who made it for them. This is when we can often find them "out there", just not at Honda's dealers.

I think this petcock kit has been on-off for years. ;)
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline Kevin D

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #4 on: April 25, 2025, 05:16:41 AM »
Quote
With Honda's parts, whenever the last 3 digits become -670 (or nearly anything "6xx") it indicates that Honda has stopped stocking it (again) and it has been turned out to the vendors who made it for them.

That’s good to know.
71 CB750 K1
106,000 miles
Original Owner
———past———
70 SL100/125/150
70 Candy BlueGreen CB 750 K0
————————————————-
Former Honda parts kid/counter kid/do all
—————————————————————-
Whether you think you can or think you can’t, you’re right
Genius is 99% perspiration, 1% inspiration

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #5 on: April 25, 2025, 05:43:38 AM »
I found a kit on eBay:
https://www.ebay.com/itm/226233476688

It might be discontinued again, but there's a zillion of them out there. With Honda's parts, whenever the last 3 digits become -670 (or nearly anything "6xx") it indicates that Honda has stopped stocking it (again) and it has been turned out to the vendors who made it for them. This is when we can often find them "out there", just not at Honda's dealers.

I think this petcock kit has been on-off for years. ;)

Thanks for the info Mark, but that's the wrong part.

Offline HondaMan

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #6 on: April 25, 2025, 11:00:37 AM »
I found a kit on eBay:
https://www.ebay.com/itm/226233476688

It might be discontinued again, but there's a zillion of them out there. With Honda's parts, whenever the last 3 digits become -670 (or nearly anything "6xx") it indicates that Honda has stopped stocking it (again) and it has been turned out to the vendors who made it for them. This is when we can often find them "out there", just not at Honda's dealers.

I think this petcock kit has been on-off for years. ;)

Thanks for the info Mark, but that's the wrong part.

Hmm..those are the only seals in the petcock: the rest of the body is a valve. If the valve itself is leaking, the whole petcock must be replaced, which must be where you started?

The Zamac body and spigot (the part with the lever on it) was cast and made as one unit. Then the other seals were added, going up to the tank. MTBE ate at the Zamac during those years when it was in our gasolines, making the surfaces irregular and not smooth and straight. Then, yeah, they weep fuel afterwards.

Then you ARE stuck with finding a new petcock. :(

Our modern fuels are not a lot better: this is why I advocate for adding some oil to the fuel, which helps a lot to neutralize the non-gasoline effects on the metals. Just one example from Denver, CO: there is butane (or was, from October 1 until March 31 and then however long it takes to deplete the gas station's tanks) in our fuel now, and it dries out and cracks any rubber line in the fuel system. Then, as soon as it moves for any reason, it weeps gas, with the usual results, fires, etc. So, I have ceased riding my own 750 between those dates, as I got tired of replacing the fuel hoses every stinking year because of it. Oil in the gas greatly reduces the effect, but it still removes the flexibility from the hose itself in just one season, turning them into a soft plastic that breaks when flexed 180 degrees.
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #7 on: April 25, 2025, 11:42:33 AM »
Here is the o ring I am referring to.......finger point...

Offline CycleRanger

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #8 on: April 25, 2025, 03:13:05 PM »
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #9 on: April 25, 2025, 03:40:43 PM »

Offline CycleRanger

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #10 on: April 25, 2025, 04:48:54 PM »
Maybe this?
https://www.ebay.com/itm/235100962638

That's it, just purchased.  Thanks CycleRanger!

You're welcome. Pictures were helpful! I hope that cures your issue.
That petcock reminds me a lot like the ones on my XS650 with that cone-shaped stopper, for which kits are available.
I wonder if the o-ring is the same size.
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline newday777

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #11 on: April 25, 2025, 04:52:38 PM »
Here is the o ring I am referring to.......finger point...
That's the oring I  was looking for here in my thread on it

http://forums.sohc4.net/index.php?topic=196218.new;topicseen#new
« Last Edit: April 25, 2025, 05:03:24 PM by newday777 »
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #12 on: April 25, 2025, 05:02:26 PM »
^Did you find one Stu?

Offline newday777

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #13 on: April 25, 2025, 05:08:56 PM »
^Did you find one Stu?
Well not back in January but just ordered a couple from cycleranger's link thanks
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline HondaMan

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #14 on: April 25, 2025, 07:15:29 PM »
Ah, I see: does the 2x18mm size fit that face seal? If it does, I'll order up a batch of them at Rocket so we can get them without spending $20 each for them.
« Last Edit: April 26, 2025, 10:25:00 AM by HondaMan »
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline CycleRanger

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #15 on: April 25, 2025, 08:29:04 PM »
^Did you find one Stu?
Well not back in January but just ordered a couple from cycleranger's link thanks

I missed your thread, sorry.  :)
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline newday777

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #16 on: April 26, 2025, 04:40:08 AM »
Does the 2x18mm size fit that face seal? If it does, I'll order up a batch of them at Rocket so we can get them without spending $20 each for them.
I don't think I have a 2x18mm to try. Yet anyhow.
I did order the ones from cycleranger's ebay link and will measure when it arrives.
« Last Edit: April 26, 2025, 04:41:49 AM by newday777 »
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline newday777

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #17 on: April 26, 2025, 04:44:07 AM »
^Did you find one Stu?
Well not back in January but just ordered a couple from cycleranger's link thanks

I missed your thread, sorry.  :)
No problem. The bikes were off the road for winter anyhow and I was going through those petcocks
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline ClawSS

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #18 on: April 29, 2025, 07:19:26 PM »
Quote
Hmm..those are the only seals in the petcock: the rest of the body is a valve. If the valve itself is leaking, the whole petcock must be replaced, which must be where you started?

The Zamac body and spigot (the part with the lever on it) was cast and made as one unit. Then the other seals were added, going up to the tank. MTBE ate at the Zamac during those years when it was in our gasolines, making the surfaces irregular and not smooth and straight. Then, yeah, they weep fuel afterwards.

Then you ARE stuck with finding a new petcock. :(

Our modern fuels are not a lot better: this is why I advocate for adding some oil to the fuel, which helps a lot to neutralize the non-gasoline effects on the metals. Just one example from Denver, CO: there is butane (or was, from October 1 until March 31 and then however long it takes to deplete the gas station's tanks) in our fuel now, and it dries out and cracks any rubber line in the fuel system. Then, as soon as it moves for any reason, it weeps gas, with the usual results, fires, etc. So, I have ceased riding my own 750 between those dates, as I got tired of replacing the fuel hoses every stinking year because of it. Oil in the gas greatly reduces the effect, but it still removes the flexibility from the hose itself in just one season, turning them into a soft plastic that breaks when flexed 180 degrees.

What octane or type of fuel do you recommend running? (Book arrives Friday btw) I have access to pretty much all types here in Northern Kentucky including ethanol free, E85, U88 (E15). I would assume ethanol free, but I am unsure.
Stupider follow-up question, you recommend putting some oil in the gas to reduce degradation of rubber fuel components, is this the same as the engine oil and what are the measurements of oil to fuel. For example, per fill up are you giving it a "snort" or "drop" or are you tracking it in detail to like 50 parts gas to 1 part oil ratio? 😂
« Last Edit: May 01, 2025, 05:39:36 AM by ClawSS »

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #19 on: April 29, 2025, 07:45:05 PM »
^I use ethanol free 89 octane, and add about 1/2 teaspoon of 2 stroke oil per tank of gas.

Offline newday777

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #20 on: April 29, 2025, 07:59:27 PM »
You will need to fix those connections.

I use regular pump gas 87 octane and add 2 oz of 2 stroke oil to a tank of gas.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Stev-o

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #21 on: April 30, 2025, 08:25:52 AM »
^I use ethanol free....


+1...ethanol free
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline HondaMan

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #22 on: April 30, 2025, 06:49:51 PM »
What octane or type of fuel do you recommend running? (Book arrives Friday btw) I have access to pretty much all types here in Northern Kentucky including ethanol free, E85, U88 (E15). I would assume ethanol free, but I am unsure.
Stupider follow-up question, you recommend putting some oil in the gas to reduce degradation of rubber fuel components, is this the same as the engine oil and what are the measurements of oil to fuel. For example, per fill up are you giving it a "snort" or "drop" or are you tracking it in detail to like 50 parts gas to 1 part oil ratio? 😂
You will need to fix those connections.

I use regular pump gas 87 octane and add 2 oz of 2 stroke oil to a tank of gas.

^^ What he said...
I use the old oil I drained from my last oil change, or else the 2-stroker oil (sometimes even the synthetic kind). Here in Colorado in particular, lots of old-time bike are getting it now as word started going 'round about it last year when we got stuck with extra butane in the gas here. It really helps, and slows down the carb's drying out over the winter, we've discovered. Nice side effect. :)
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline grcamna2

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #23 on: April 30, 2025, 08:32:54 PM »
Following
75' CB400F/'bunch o' parts'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline denward17

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Re: O Ring source for fuel use-petcock-CB550K
« Reply #24 on: May 01, 2025, 09:37:01 AM »
Got my o ring today from Ebay seller listed above.

Best I can tell, it measured 1.7mm x 19mm.  I put my petcock together with it, won't be able to test until next week.