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Author Topic: Float Bowl Gaskets  (Read 1506 times)

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Offline cphlegar

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Float Bowl Gaskets
« on: June 19, 2011, 08:15:24 PM »
Need to order a set of float bowl gaskets for a 77 CB750k. I found sets listed for 69-76 that look like the ones I need, and sets listed for 77-78 that DO NOT look like the ones I need. What's that about and where can I order a set I know will be the right ones? Any help is appreciated. -Chris
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Offline cphlegar

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Re: Float Bowl Gaskets
« Reply #1 on: June 19, 2011, 09:16:58 PM »
I am beginning to suspect that I have some 69-75 carbs on my 77 bike...
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bollingball

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Re: Float Bowl Gaskets
« Reply #2 on: June 20, 2011, 09:36:02 AM »
 cphlegar:Tell us the numbers on the side of the carbs and you won't have to suspect any longer. Should be something like PD42a

                 Ken
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Offline cphlegar

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Re: Float Bowl Gaskets
« Reply #3 on: June 20, 2011, 10:12:22 AM »
Not on the side but on the front sort of lip that meets the stay plate they read 7A JB. And I've checked out schematics on several different parts sites and these are clearly not the carbs for the 77 model. Seem to be 76 or earlier.
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bollingball

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Re: Float Bowl Gaskets
« Reply #4 on: June 20, 2011, 04:31:14 PM »
Can you post a picture of them? Are they KeiHin carbs look at the outside edge of #4 card just above the bowl gasket on a raised rectangle for the numbers. Are the tops round or like a keyhole?


                Ken
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Offline cphlegar

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Re: Float Bowl Gaskets
« Reply #5 on: June 20, 2011, 07:33:00 PM »
yes, they are KeiHin carbs. they are round on top. no numbers on the side though. i've taken them off and completely apart to clean so I know they do not match the 77 schematics. will try to post some pics tomorrow. thanks. -chris
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Offline Coyote13

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Re: Float Bowl Gaskets
« Reply #6 on: June 20, 2011, 08:43:49 PM »
They aren't CR's are they?
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Offline cphlegar

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Re: Float Bowl Gaskets
« Reply #7 on: June 21, 2011, 08:17:11 PM »
Don't know what CR means, but pics of carb rebuild kits for 69-75 look just like all the parts I saw when I had them apart. Did 100 miles today around Houston and only minimal leakage with the gaskets I made :) Still need to figure out which are the proper ones and order them though.
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Offline Spanner 1

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Re: Float Bowl Gaskets
« Reply #8 on: June 21, 2011, 10:08:25 PM »
Yep, your carbs are the older type and 69-76 type rebuild kit/bowl gaskets are correct. Be careful when mating the bowl to carb that the gasket stays put and does not bow-in any as the floats are mighty close to the sides of the bowl and can foul on the gasket ( and make the carbs overflow ) if its not seated just right.... a small smear of Vaseline on the gasket surface might help with that..... good luck.
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Offline db22

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Re: Float Bowl Gaskets
« Reply #9 on: June 22, 2011, 06:52:37 AM »
Quote from: cphlegar on June 20, 2011, 07:33:00 PM
yes, they are KeiHin carbs. they are round on top. no numbers on the side though. i've taken them off and completely apart to clean so I know they do not match the 77 schematics. will try to post some pics tomorrow. thanks. -chris
How does this happen?  My '75 CB550K has '77 PD46A carbs.  This could turn into another PO thread. . .
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1975 CB550K (shaping up, slowly)
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bollingball

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Re: Float Bowl Gaskets
« Reply #10 on: June 22, 2011, 07:08:04 AM »
db: How does what happen? Not sure what you are asking?

           Ken
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Offline Bankerdanny

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Re: Float Bowl Gaskets
« Reply #11 on: June 22, 2011, 07:26:42 AM »
It happens because some prior owner thought that the older style carbs would be superior or had problems with the stock ones and a good older set on hand and decided to swap in the old set rather than rebuild the stock ones.
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Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline db22

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Re: Float Bowl Gaskets
« Reply #12 on: June 22, 2011, 07:36:40 AM »
Quote from: bollingball on June 22, 2011, 07:08:04 AM
db: How does what happen? Not sure what you are asking?

           Ken
I meant: How do we end up with bikes powered by engines fitted with carburetors from another year model?  Cphlegar has a bike with older carbs, I have a bike with newer carbs.  It would be fascinating to see a complete documentation of the past lives of both of these motorcycles.  My bike also came to me with an ill-fitting tank, a Honda tank from a completely different bike.  The bike had beem out of registration for so long that the DMV could find no record of its existence.  Had to have it inspected by a sherriff's deputy and re-titled from scratch.

It was worth the effort, though.  What had been a rusting relic is now back on the road, with a lot of help from people on this forum.
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1975 CB550K (rider)
1975 CB550K (shaping up, slowly)
I may be goin' to hell in a bucket, but at least I'm enjoyin' the ride. . .

Offline cb750k7

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Re: Float Bowl Gaskets
« Reply #13 on: June 22, 2011, 09:28:04 AM »
I have bought the whole kit for the 76' here
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=140547078681

Quick shipping and highly recommended.
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Offline Duanob

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Re: Float Bowl Gaskets
« Reply #14 on: June 22, 2011, 12:44:14 PM »
Quote from: db22 on June 22, 2011, 06:52:37 AM
Quote from: cphlegar on June 20, 2011, 07:33:00 PM
yes, they are KeiHin carbs. they are round on top. no numbers on the side though. i've taken them off and completely apart to clean so I know they do not match the 77 schematics. will try to post some pics tomorrow. thanks. -chris
How does this happen?  My '75 CB550K has '77 PD46A carbs.  This could turn into another PO thread. . .

It's called buyer beware. You (as the rest of us) won't make that mistake twice! Now that you've been through it before, you will know what to look out for.

EDIT TO ADD:

Take what a PO says with a grain of salt. You can't spell POS without PO!
« Last Edit: June 22, 2011, 12:55:22 PM by Duanob »
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Offline cphlegar

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Re: Float Bowl Gaskets
« Reply #15 on: June 27, 2011, 11:46:05 AM »
Pic attached. Can anyone confirm which gaskets I need?
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Offline DJ_AX

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Re: Float Bowl Gaskets
« Reply #16 on: June 27, 2011, 07:39:13 PM »
Looks exactly like the carbs on my 75 750....


... and although I could be wrong, I do strongly suspect that I have carbs from a 75 750 ;-)
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Offline cphlegar

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Re: Float Bowl Gaskets
« Reply #17 on: June 27, 2011, 10:07:59 PM »
Thanks! Think I'll move forward on this.
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