Topic: are there any good sources for float bowl gaskets

[02z06dave]

I typically try to save the originals if i can, but the bike (cb350f) didn't come with any, so I had to buy new ones. I've bought from pretty much all of the ebay sellers and they all seem to sell the same gaskets. They are all too small when you first fit them, then they swell up huge after they touch fuel. Its making it a real pain dealing with these carbs. Are there any sellers out there that use the proper rubber for the gaskets?

[MauiK3]

I got my carb rebuild stuff from Yamiya 750.com
No failures, all good.

[AwesomeCB]

Any reason you don’t want OEM gaskets, which you can get from many Honda dealers, eBay and so on? After trying all kinds of aftermarket parts for my bikes, I try to stick with OEM for most everything.

[madmtnmotors]

they swell up huge after they touch fuel laced with ethanol

Stock Honda parts resist the affects of ethanol quite well. If you are left with only aftermarket options for fuel related rubber bits (i.e. NLA from Honda) then try to find rubber bits made of Viton rubber. It will usually be indicated in the description portion of the ad, like these:

https://4into1.com/shaped-o-ring-float-bowl-gaskets-4-pack-honda-cb350f-cb400f/

[ekpent]

 I used some quality 68mm x 2mm round o-rings on a recent 550 and 500 project and they worked well so far on the bowls. Good idea to replace all the other o-rings in there on the jet,fuel valve etc. also if they are like the 500/550 carbs.

[flybox1]

they swell up huge after they touch fuel laced with ethanol

Stock Honda parts resist the affects of ethanol quite well. If you are left with only aftermarket options for fuel related rubber bits (i.e. NLA from Honda) then try to find rubber bits made of Viton rubber. It will usually be indicated in the description portion of the ad, like these:

https://4into1.com/shaped-o-ring-float-bowl-gaskets-4-pack-honda-cb350f-cb400f/

^^^^ this.  4into1 is a good seller.

[02z06dave]

Any reason you don’t want OEM gaskets, which you can get from many Honda dealers, eBay and so on? After trying all kinds of aftermarket parts for my bikes, I try to stick with OEM for most everything.

I haven't seen oem honda gaskets anywhere or i would have bought them.

[02z06dave]

they swell up huge after they touch fuel laced with ethanol

Stock Honda parts resist the affects of ethanol quite well. If you are left with only aftermarket options for fuel related rubber bits (i.e. NLA from Honda) then try to find rubber bits made of Viton rubber. It will usually be indicated in the description portion of the ad, like these:

https://4into1.com/shaped-o-ring-float-bowl-gaskets-4-pack-honda-cb350f-cb400f/

Im currently on my 2nd set from 4 into 1. The exact ones you posted. They are the same as all the rest

[madmtnmotors]

they swell up huge after they touch fuel laced with ethanol

Stock Honda parts resist the affects of ethanol quite well. If you are left with only aftermarket options for fuel related rubber bits (i.e. NLA from Honda) then try to find rubber bits made of Viton rubber. It will usually be indicated in the description portion of the ad, like these:

https://4into1.com/shaped-o-ring-float-bowl-gaskets-4-pack-honda-cb350f-cb400f/

Im currently on my 2nd set from 4 into 1. The exact ones you posted. They are the same as all the rest

That's odd. "Same as all the rest"? You mean they are turning soft and swelling excessively? I have had good results with Viton rubber. I wonder if the supplier of these to 4into1 is cheating on the Viton construction? Maybe they just take plain rubber gaskets and wave it over the vat of Viton rubber? 

I would reach out to 4into1 and explain the failure of the supposedly "Viton" rubber when exposed to ethanol based fuel. True Viton rubber should not react to ethanol that way.

[02z06dave]

they swell up huge after they touch fuel laced with ethanol

Stock Honda parts resist the affects of ethanol quite well. If you are left with only aftermarket options for fuel related rubber bits (i.e. NLA from Honda) then try to find rubber bits made of Viton rubber. It will usually be indicated in the description portion of the ad, like these:

https://4into1.com/shaped-o-ring-float-bowl-gaskets-4-pack-honda-cb350f-cb400f/

Im currently on my 2nd set from 4 into 1. The exact ones you posted. They are the same as all the rest

That's odd. "Same as all the rest"? You mean they are turning soft and swelling excessively? I have had good results with Viton rubber. I wonder if the supplier of these to 4into1 is cheating on the Viton construction? Maybe they just take plain rubber gaskets and wave it over the vat of Viton rubber? 

I would reach out to 4into1 and explain the failure of the supposedly "Viton" rubber when exposed to ethanol based fuel. True Viton rubber should not react to ethanol that way.

Yeah, i bought a set from them for one bike, then ordered another set for another bike. The carbs one bike 1 were leaking from the over flows so i took the carbs apart to check float height and the gaskets were so swollen up that they were unusable. Luckily i had the other set ready. Unfortunately, even new, they dont fit the bowls. They're just a little too small. It makes installing them a little challenging

[flybox1]

The listing says they are viton, so they should not swell, no matter how long they sit in fuel.
I think a call to 4into1 is warranted....

[AwesomeCB]

Any reason you don’t want OEM gaskets, which you can get from many Honda dealers, eBay and so on? After trying all kinds of aftermarket parts for my bikes, I try to stick with OEM for most everything.

I haven't seen oem honda gaskets anywhere or i would have bought them.

I thought places like Partzilla, Southside Honda etc. sold them. I get OEM CB750 parts from them often. There's also eBay, if you want to go that route. Here's the first ad I came across:
https://www.ebay.com/itm/Honda-CB350-CB350F-CB-350-carburetor-carb-gasket-seal-set-OEM/183338768000?epid=1111840439&hash=item2aafd79680:g:NNAAAOSwEzxYRE~h:rk:30:pf:0

[madmtnmotors]

Partzilla shows four in stock:

https://www.partzilla.com/product/honda/16010-333-315

[02z06dave]

Any reason you don’t want OEM gaskets, which you can get from many Honda dealers, eBay and so on? After trying all kinds of aftermarket parts for my bikes, I try to stick with OEM for most everything.

I haven't seen oem honda gaskets anywhere or i would have bought them.

I thought places like Partzilla, Southside Honda etc. sold them. I get OEM CB750 parts from them often. There's also eBay, if you want to go that route. Here's the first ad I came across:
https://www.ebay.com/itm/Honda-CB350-CB350F-CB-350-carburetor-carb-gasket-seal-set-OEM/183338768000?epid=1111840439&hash=item2aafd79680:g:NNAAAOSwEzxYRE~h:rk:30:pf:0

I could give those a try. In the past, ive stayed away from the round ones vs the shaped ones because of terrible fit. I didnt realize that was oem for these