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I am looking for the O rings that go under the 90 degree downtubes coming off the carburators to the cylinders (about an inch and a half round) and the smaller ones that go on the pipes that sit next to them. Honda says they are no longer in production? Can I just find these in a hardware store? The larger ones seem to have a flat edge on the inside. I'm not sure if they were designed like this, or if they have just been flattened over time. Thanks for your input.
 

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Ebay #290282604288
 

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Some of the parts dealers have microfiche pages you can pull up like Hondaparts direct and they should have the size of the o ring next to the part #. I have found that some of your better stocked Ace hardware stores carry metric sizes. Some auto parts stores should carry metric,maybe even Harbor Freight. The o rings have probably just flattened out over time.
 

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These are just standard O-rings.. nothing special about them.. the 4 that you speak about are 35.5mmx2.6mm.. (and the others you could look up).. Probably some inch sizes would come close enough.. I do believe that they are still available from Honda for about $2.50 each, but you can get a whole metric assortment at Harbor Freight for about $8... I bought both the inch set and the metric set and I can usually find something that works..
 

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I just get mine from local Honda Dealer but any good auto parts place would be able to source some O rings.
 

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Could someone verify: I was told that there were two types of O rings. One is for water and the other for oil etc. Comments re the different copositions??
 

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There are two types of o-rings commonly used.
Nitrile or Buna-N is used for:

General purpose sealing.
Petroleum oils and fluids.
Cold Water.
Silicone greases and oils
Di-ester base lubricants (MIL-L-7808).
Ethylene glycol base fluids (Hydrolubes)

Nitrile is not recommended for:
Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene)
Nitro hydrocarbons (nitrobenzene, aniline)
Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul).
Ketones (MEK, acetone)
Strong Acids Ozone
Automotive brake fluid.

Viton or FKM is used with
:
Petroleum oils. Di-ester base lubricants (MIL-L-7808, MIL-L-6085).
Silicate ester base lubricants (MLO 8200, MLO 8515, OS-45.)
Silicone fluids and greases.
Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene).
Selected phosphate ester fluids. Acids.

FKM is not recommended for:
Ketones (MEK, acetone). Skydrol fluids.
Amines (UDMH), anhydrous ammonia.
Low molecular weight esters and ethers.
Hot hydrofluoric or chlorosulfonic acids.

Looks like buna will do for most applications.
 
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