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TOPIC: Exhaust Gasket - string type

Exhaust Gasket - string type 28 Jan 2017 12:29 #1

  • Makotosun
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Not really a how to, but rather a place to put a picture of how the string exhaust gasket that is used on a lot of the early bikes and the MX bikes actually is installed. I took a few pics while laying under the MX360 as the question seems to come up often.

This is when you install part number 248-14623-00-00 which is used on a lot of bikes. I will post in a table of the bikes after the pics.

The gasket goes into the little slot on the chrome bit that attaches to the cylinder, then the pipe slides in and crush fits the gasket.







These are the bikes that use this gasket:




Hopefully that can help someone who is a bit confused when they receive the gasket in the mail.
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Exhaust Gasket - string type 07 Feb 2019 06:30 #2

  • Mauser
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Many thanks just got my new string gasket and your picture say's a thousand words.
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RT2 ~ XR650R ~ DT175MX ~ ZX12R ~ XJR1300 ~ DT125LC ~ XR250R ~ XL125R ~ RD350LC ~ MT50 ~ GPZ1100

Exhaust Gasket - string type 07 Feb 2019 21:32 #3

  • Steve F
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Would love to hear how it works out as I installed this same gasket in #332 IT175E, and it blew out in short order on the 1st ride. Installed another & same result,,,:unsure:
The guys on the IT face book pages are using high temp silicone to seal this joint with. That's what I'm going to try with my current IT project.

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1974 DT250A, his
1974 DT250A, hers
1974 GT80A
1978 IT175E
1978 IT175E No. 332 -SOLD
"Is everything connected properly?"

Exhaust Gasket - string type 07 Feb 2019 22:59 #4

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Steve F wrote: Would love to hear how it works out as I installed this same gasket in #332 IT175E, and it blew out in short order on the 1st ride. Installed another & same result,,,:unsure:
The guys on the IT face book pages are using high temp silicone to seal this joint with. That's what I'm going to try with my current IT project.


It has worked fine for me, but I know GFrench uses the high temp silicon approach and swears by it. Go to post number 72 in this thread:

yamaha-enduros.com/index.php/forums/rest...fresh?start=70#12025

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Exhaust Gasket - string type 07 Feb 2019 23:55 #5

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I placed the string gasket into the groove then fitted the exhaust, sounds like you fitted the exhaust then stuffed the string down into the gap ?. I would say it's impossible for it to blow out if fitted first ?, I used 1 turn on the string only I am presuming the rest is spare for future use ?.

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RT2 ~ XR650R ~ DT175MX ~ ZX12R ~ XJR1300 ~ DT125LC ~ XR250R ~ XL125R ~ RD350LC ~ MT50 ~ GPZ1100

Exhaust Gasket - string type 08 Feb 2019 01:51 #6

  • Swoop56
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I have used the OEM Yamaha string , but smeared it with Hi Temp silicon .
I used the whole string .
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Exhaust Gasket - string type 08 Feb 2019 20:46 #7

  • Steve F
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Sorry Mauser, guess I should have stated that I installed the string 1st for a crushed seal and it blew out 1st ride. Why?

Mako, thanks for the link to greg's bike. that info is very useful..

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1974 DT250A, his
1974 DT250A, hers
1974 GT80A
1978 IT175E
1978 IT175E No. 332 -SOLD
"Is everything connected properly?"
Last Edit: by Steve F. Reason: add a note

Exhaust Gasket - string type 11 Feb 2019 17:15 #8

  • Memorylane
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I just went through this on my RT2 and I have something to add
When I went to install the string I took a thin pick and was certain that I had all the old string out, it felt and sounded like I was scratching metal
So I wound in all the new string and tried to install the pipe and the bolt holes wouldn’t line up, like the pipe wasn’t going into the spigot far enough
Took the spigot off again and realized that it’s 2 peices, you can tap the center out of it and that’s when I found 2 old strings and my new one!
When going back together my pipe fit best with about half of the string and no leaks so far but no much time on it yet.
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My life is a hilarious series of wrong turns, and to quote bugs bunny “I should have taken a left at Albuquerque!”
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