Two stroke exhaust seal question

Rohr144
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Rohr144
Edited Date/Time 3/12/2018 5:01pm
The part I'm referring to is circled in red in the picture. What exactly do these metal rings do? I bought my yz a few months ago, and when I did the top end rebuild, thone rings weren't there. I've been told that they can kind of adjust the power curve of the bike, and I was wondering if this is true. I have the metal rings, and I'm thinking about putting them in and seeing if there's a difference. Has anyone noticed a difference with or without them?

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AJ565
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AJ565 3/12/2018 3:37pm
3/12/2018 3:37pm
Adding them in gives a little more bottom and mid. If you shortened the exhaust neck you'd get more top end, but lose bottom end.
Rohr144
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Rohr144 3/12/2018 4:32pm
3/12/2018 4:32pm
AJ565 wrote:
Adding them in gives a little more bottom and mid. If you shortened the exhaust neck you'd get more top end, but lose bottom end.
If that's the case then they're definitely going in.. thanks man!
Joko
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Joko 3/12/2018 4:59pm
3/12/2018 4:59pm
Those are o-rings for sealing purposes, not spacers.
easydoesit
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easydoesit 3/12/2018 5:00pm
3/12/2018 5:00pm Edited Date/Time 3/12/2018 5:01pm
^^ This. Those o-rings are not optional.

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Rohr144
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Rohr144 3/12/2018 6:10pm
3/12/2018 6:10pm
Just took the pipe off. After closer inspection, the rubber o rings are actually there. What isn't there is the metal spacer.

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