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VERY important !!!
Don't run the engine without them.
Get a bunch, and whenever the pipes get taken on/off examine them - if they get too flat replace them.

Maybe the remnants are still in the head - take a look and see....sometimes they're so old and smashed you can't recognize them, with all the carbon and stuff around.
 

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Uh Oh........ I am not sure my bikes have those. I have two 350's a 450 and a CM91 that if they do have them they are stuck up in there and not recognizeable like was posted above. I know that my GL1200 has them in there though.
I dont notice any leaking around those pipes on any of my bikes so maybe they are there. I would imagine now that I think about it that it could cause some problems with heat that may not be taken away by the header pipes?
Don
 

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It will lead to big time exhaust leak there, maybe fry your exhaust valves.

A lot of times you actually have to pry out what's left of the old ones with a screwdriver or hook....
 

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I think I will get the proper rings and put in new ones. Hopefully there are still some in there. I have never really paid much attention for them other than on my Gold Wings for some reason.
Thanks,
Don
 

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tbpmusic said:
A lot of times you actually have to pry out what's left of the old ones with a screwdriver or hook....
It was a PITA to get the old donuts out but, I used my little dentist type hook and pried them out of my CL350K3 head.
New exhaust donuts are readily available at Honda.
 

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I'm guessing that the copper donut is so infrequently spoken of, that most don't even know about it. I say this because I didn't know about it until I looked at the fische. I thought that maybe my bike didn't have them. However, I just pulled 6 smushed copper donuts out of the head of my CL350.

Given that I found 3 of them in there, that's just bad form, right? I mean, it's not detrimental, but silly. A tack pry bar works great for poppin' 'em out.

 
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