Two stroke exhaust seal question

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3/12/2018 2:10 PM

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?Photo

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3/12/2018 3:37 PM

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.

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2018 KTM 250sx
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3/12/2018 4:32 PM

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 ...more

If that's the case then they're definitely going in.. thanks man!

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3/12/2018 4:59 PM

Those are o-rings for sealing purposes, not spacers.

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3/12/2018 5:00 PM
Edited Date/Time: 3/12/2018 5:01 PM

^^ This. Those o-rings are not optional.

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3/12/2018 6:10 PM

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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