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Author Topic: Cheap aftermarket Carb O-rings  (Read 1172 times)

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Offline rtbmrgl

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Cheap aftermarket Carb O-rings
« on: November 12, 2013, 06:51:39 PM »
Are aftermarket Carb O-rings crap?   >:(
One month after replacing all the carburetor o-rings on my CB500 I found that all of them were brittle and the ones between the carbs were leaking.
Ive never seen o-ring go bad this fast.
I ordered OEM kit from Honda and replaced then all.
Has anyone have any experience with this, bought them on eBay.

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thanks, Mark
Roseville, Ca

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1973 CB500 back yard find 1243 orig mi,  http://forums.sohc4.net/index.php?topic=124285.0
1976 CB750 Restoring,        http://forums.sohc4.net/index.php?topic=132997

Offline flybox1

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Re: Cheap aftermarket Carb O-rings
« Reply #1 on: November 13, 2013, 10:15:04 AM »
buy Honda brand only.
if you cant, Viton (FKM) has the best temp and chem resistance.
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'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
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"This is my CB. There are many like it, but this one is mine…"

Offline Bailgang

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Re: Cheap aftermarket Carb O-rings
« Reply #2 on: November 13, 2013, 02:22:28 PM »
Quote from: flybox1 on November 13, 2013, 10:15:04 AM
buy Honda brand only.
if you cant, Viton (FKM) has the best temp and chem resistance.

+1

Viton o-rings did the trick for my 550.
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Scott


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Offline goldarrow

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Re: Cheap aftermarket Carb O-rings
« Reply #3 on: November 13, 2013, 02:46:29 PM »
My first set of carbs i used honda kit, then after that I've been using those ones off eBay with no issues for my other bikes
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Offline Duke McDukiedook

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Re: Cheap aftermarket Carb O-rings
« Reply #4 on: November 14, 2013, 10:52:33 AM »
+1 on Viton.
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"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

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Offline rtbmrgl

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Re: Cheap aftermarket Carb O-rings
« Reply #5 on: November 14, 2013, 11:29:39 AM »
Thanks for the reply's. I was pretty shocked they deteriorated so fast.
Does Viton sell o-ring kings for bikes or do you order size to fit. Does anyone have a list of the o-ring sizes for the CB500 carbs?
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thanks, Mark
Roseville, Ca

Got Points!

1973 CB500 back yard find 1243 orig mi,  http://forums.sohc4.net/index.php?topic=124285.0
1976 CB750 Restoring,        http://forums.sohc4.net/index.php?topic=132997

Offline flybox1

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Re: Cheap aftermarket Carb O-rings
« Reply #6 on: November 15, 2013, 01:11:32 PM »
buna-n & nitrile have OK chem resistance, but they wont last long with temps over 200F.  viton(aka FKM) is the material, not the mfr, and will withstand temps up to ~400F
there are metric viton o-ring kits available online. they aren't cheap.  it gets expensive when you have to take the time to do it all again down the road.  (I just replaced 6 orings, none larger than 18mmx3mm, for about $22)
all of the oring sizes are listed in the parts fiche pages for your bike.  check them out on cmsnl.com

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'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)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Duanob

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Re: Cheap aftermarket Carb O-rings
« Reply #7 on: November 15, 2013, 01:41:56 PM »
I buy the honda kits. No problemo.
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"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

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Offline Xnavylfr

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Re: Cheap aftermarket Carb O-rings
« Reply #8 on: November 15, 2013, 02:34:37 PM »
WOW, somebody saw you guys coming!! I just bought some VITON "O" rings for the 750  carb T fittings from NAPA and they cost me around  2$ each.



Xnavylfr(CHUCK)
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Offline Bailgang

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Re: Cheap aftermarket Carb O-rings
« Reply #9 on: November 16, 2013, 06:03:03 PM »
Quote from: Xnavylfr on November 15, 2013, 02:34:37 PM
WOW, somebody saw you guys coming!! I just bought some VITON "O" rings for the 750  carb T fittings from NAPA and they cost me around  2$ each.



Xnavylfr(CHUCK)

Not here in fact my local NAPA had the same o-ring assortment I had which was nitrile. I had to order mine online because nobody around here had viton.
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77 cb750 F2
83 gl1100 Interstate

Offline Duke McDukiedook

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Re: Cheap aftermarket Carb O-rings
« Reply #10 on: November 18, 2013, 07:12:06 AM »
Quote from: rtbmrgl on November 14, 2013, 11:29:39 AM
Thanks for the reply's. I was pretty shocked they deteriorated so fast.
Does Viton sell o-ring kings for bikes or do you order size to fit. Does anyone have a list of the o-ring sizes for the CB500 carbs?

Just take the rings with you to your local o-ring dealer if they have not disintigrated yet, they should be able to find you the proper fit.
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"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

"It's Baltimore, gentlemen. The gods will not save you." Ervin Burrell

CB750 K3 crat | (2) 1986 VFR750F
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