Exhaust "Gasket, Muffler" Life?

[spoonlamp]

I took off the exhaust while putting on my hugger and it looks like the gasket/muffler w/e has preished some - is that what this is?
I can add more pics if required.


My questions are;
Do you expect this to happen every time you take the exhaust off?
Is about £20 a reasonable price to replace?
Will an after market can come with a new one?


Many thanks 

[simonm]

I know nowt about this but it made me curious.  Does the following youtube clip assist in any way ?


https://www.youtube.com/watch?v=BRMqssNZbKo

[spoonlamp]

Thanks for the reply, but no gasket is shown or mentioned in that clip
:'(

[simonm]

If you go to the download section, get the haynes manual, look in the fuel section (4_fuel.pdf) page 18 of 22 gives some explanation of the process behind removing and reinstalling the exhaust.


I also found this ([size=78%]http://www.delkevic.co.uk/?section=shop&...&order_by=[/size])


I have no idea what the large silver ring is for, but I know where the copper rings go 

[simonm]

Silencer
Removal
1  On YZF  models,  if required for improved clearance  and  to  avoid  the  possibility  of damage,  remove the right-hand fairing side panel (see Chapter 8, Section 3).
2  Slacken  the  clamp  bolt  securing  the silencer  to  the  downpipe  assembly  (see illustration).
3  Unscrew and remove the silencer mounting bolt, then release the silencer from the exhaust downpipe assembly (see illustration).
4  Remove the sealing ring from the end of the silencer or downpipe assembly and discard it as a new one should be used. Installation
5  Fit the new sealing ring onto the end of the downpipe  assembly.
6  Fit  the  silencer  onto  the  downpipe assembly,  making  sure  it  is  pushed  fully home. Align the silencer mounting bracket at the  rear and  install  the  bolt,  but  do  not  yet tighten it.
7  Tighten the clamp bolt to the torque setting specified at the beginning of the Chapter, then tighten  the  silencer  mounting  bolt  to  the specified torque (see  illustrations  3.2 and 13.3).
8  Run the engine and  check the system for leaks.


The pictures don't show any gasket or sealing ring.

[spoonlamp]

Thanks simon, key bit for me is -
"4 Remove the sealing ring from the end of the

silencer or downpipe assembly and discard itas a new one should be used."


Hoping someone who has changed their exhaust or this sealing ring can answer my questions.


The picture with the brass rings and silver rings - silver is obviously this sealing ring - no idea about the others...

EDIT: [Duh - brass ones must be for the top of the downpipes, wasn't thinking about that end of the pipe!]

[simonm]

Hoping someone who has changed their exhaust or this sealing ring can answer my questions.

I'll get my coat then

The picture with the brass rings and silver rings - silver is obviously this sealing ring - no idea about the others...

The brass rings are seals and go where the 4 downpipe's attach to the engine block (cylinder head ports), I understand they're supposed to 'crush' creating a good seal.  These are for when you replace the downpipes rather than the silencer.

Again, just guessing on all of this </not_expert>

looks like you can buy it for about £11.28 including shipping (this may be the wrong year bike, so you'll need to search on the site again... http://www.wemoto.com/bikes/yamaha/fzs_6...tal_fiber/

[Dead Eye]

The 4 gold / bronze seals are indeed for the connection at the head

The other one is a seal between the end of the downpipes and the link pipe on the stock exhaust. A replacement should be easy to get hold of if you need it

Most aftermarket exhausts I've seen however do not use a gasket at this end. The metal pipes are bored so that they are a very tight fit. My Beowulf can has to be heavily persuaded on and that's without a gasket. It did come with one I believe, but I was never going to be able to use it so didn't and I've had no issues. There are no air leaks in the joins (no major ones at least) and I haven't had to use any sort of external sealant on them either

Hope that helps

[simonm]

The 4 gold / bronze seals are indeed for the connection at the head

The other one is a seal between the end of the downpipes and the link pipe on the stock exhaust. A replacement should be easy to get hold of if you need it

Most aftermarket exhausts I've seen however do not use a gasket at this end. The metal pipes are bored so that they are a very tight fit. My Beowulf can has to be heavily persuaded on and that's without a gasket. It did come with one I believe, but I was never going to be able to use it so didn't and I've had no issues. There are no air leaks in the joins (no major ones at least) and I haven't had to use any sort of external sealant on them either

Hope that helps

Yay. I got summat right :-). As far as I can see the gauze seems to be a belt and braces affair and a bit ott. The other forums imply you can use copper grease or silicon or other things if you need to get a tight fit. Apparently if you run it for a while, provided it's tight, it will seal itself anyway.

I know nothing about engines or exhausts so I'll get my coat.... Again.

[spoonlamp]

lol - no coat-getting required, all useful info for me 


Below is a phot of the inside of the end of the exhaust itself. You can see bits left over from the gasket (or sealer) inside the pipe. My guess is that it's made from the highly compacted gauze and coated in like a silver paint. I reckon the whole thing compresses slightly when the can is put on and tightened and it seals once the thing gets up to heat. This is explains why the book says you need one when you take the exhaust off.


Will order one over the next couple of days.


Thanks for the help guys   

[carrier]

lol - no coat-getting required, all useful info for me 


Below is a phot of the inside of the end of the exhaust itself. You can see bits left over from the gasket (or sealer) inside the pipe. My guess is that it's made from the highly compacted gauze and coated in like a silver paint. I reckon the whole thing compresses slightly when the can is put on and tightened and it seals once the thing gets up to heat. This is explains why the book says you need one when you take the exhaust off.


Will order one over the next couple of days.


Thanks for the help guys   

Hey


I just did this a couple days ago. Yeah remove the old one (the steel wooly stuff) and replace it with a new one. It's simply to make a tight seal, But when I did it I hard a hard time getting my exhaust to go back on which lead to much deforming of the new gasket... a lot of rotating the exhaust and gasket is needed to get it inside. Don't try putting it in the exhaust and then onto the link pipe! Put it on the link pipe and then place the exhaust. Have fun!

[packie]

I have a new and unused one here that I would sell at half price. But unfortunately, I live across the pond and the post would bump it up so you be just as well to get it from over there.

[spoonlamp]

Hey

I just did this a couple days ago. Yeah remove the old one (the steel wooly stuff) and replace it with a new one. It's simply to make a tight seal, But when I did it I hard a hard time getting my exhaust to go back on which lead to much deforming of the new gasket... a lot of rotating the exhaust and gasket is needed to get it inside. Don't try putting it in the exhaust and then onto the link pipe! Put it on the link pipe and then place the exhaust. Have fun!

Thanks for this, and thanks for all the input.