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Old 12-20-2023, 06:28 PM
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SS109 SS109 is offline
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Default Weird sound diagnosis

Can anyone tell me what I'm hearing with the pitch of my exhaust changing? I have never encountered this before. Engine wasn't overheated, coolant is good, and the plug looks good (no detonation). Anyone have a clue or been through this?

https://youtu.be/YiTibRu2dos?si=STnHlkHmBtP3J5uY


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Old 12-20-2023, 09:08 PM
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Power valve flapper hanging.
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Old 12-21-2023, 09:14 AM
Jacob 'Berg Jacob 'Berg is offline
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+1. Is it making far less power at low rpm when the exhaust note changes?

Time to clean the power valve and/or replace the bearings.
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Old 12-21-2023, 11:24 AM
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Thanks guys. I just did the top end 55 hours ago. Everything was fully cleaned and inspected. Even replaced one of the bearings on the powervalves. Oh well.
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Old 12-21-2023, 04:44 PM
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Let us know after you dig into it, I?m curious as well.
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