are these supposed to look like that? head to carb adapter

[Crazy_Russian]

so ive bean suffering from a vac leak for some time now, so after getting fed up with it decided to pull the carbs off and inspect the seals that sit between the head and the adapters for the carbs (dont know the technical term for it)
anyways, apparently on cylinder #1 and #2 one of the P.O.s decided to put some sealant around the O-rings and slap it back on. well, the sealent dried up, and guise what i have... and annoying vac leak and some scraping off to do! anyways, i was wondering if the seals supossed to be flat or were they an actuall O-ring that just got squashed and flattened and hard after 34 years?

[JEEPRUSTY]

they should be fat and non flat.
they should be thick and plump.
They should not be dry or hard.

[rapidray]

That's what happens with heat & time. You need to replace the orings. Ray.

[Crazy_Russian]

thanks guys:-) these things are are hard as a rock, dose anyone have dimensions for those O-rings? Inner diameter? outer diameter? thickens?

[7981GS]

https://www.cycleorings.com

He will set you up!

Daniel

[Crazy_Russian]

i have a very good local "seal" store that i usually pick random seals and o-rings up from (different compounds, fuel resistant, different temp range, and so on and so forth) they have saved my (_!_) several number of times with my Audi. So all i need is the size, i usually try to give local guys a chance first...

[JEEPRUSTY]

VITON is the key to fuel and heat resistant joy.

Ask any of my presbyterian forebears who are down in hell.

Mind you they only have spotty dial-up service.

VITON!

Go Leafs!

[Crazy_Russian]

Viton, got it... so the I.D. is 32mm O.D. is 38mm... so 4mm thickens would be to thick... so would 2mm or 3mm work?

[JEEPRUSTY]

Viton, got it... so the I.D. is 32mm O.D. is 38mm... so 4mm thickens would be to thick... so would 2mm or 3mm work?

Go the the cycle o-rings link Robert Barr will set you right.

I bought stuff rom him that fit perfectly he is A number One

Stuff has been in service 3 yrs and running no problems.
Buying the bits OEM is insanely expensive btw.

[Graham]

I just ordered OEM o-rings, they are cheap.

[crapwacker]

they should be fat and non flat.
they should be thick and plump.
They should not be dry or hard.

Double entendre?

[tkent02]

The OEM are not as good as Viton. If you bring the boots to the seal store, they will hook you up. I'm thinking it's 2.5mm thick, but they may not be right.

[Steve]

So all i need is the size, i usually try to give local guys a chance first...

OK, how much more "local" do you want to get than a fellow member of GSR?

Member Robert Barr is "the guy" at cycleorings.com. He provides this service for fellow GSR members.
Besides the intake boot o-rings, he has a fantastic set of o-rings for your carbs that will include more o-rings
than you will find in any "rebuild" kit, and certainly much cheaper than any dealer.
You also don't have to do any research on sizes and materials, he has done it all for you.

.

[Crazy_Russian]

i can get the Viton on monday at my lunch brake.... if this was a planed repair, shore, i would get it from him, but this is unplanned and i want the bike back one the road ASAP.
so 2.5mm, ill give it a shot and ill post my results.
Thanks Guys

[Tom R]

n/m .