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#1
12-20-2023, 06:28 PM
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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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WildAzzRacing YouTube channel Trail Riders of Southern AZ club AZ State Parks OHV Ambassador '11 EC250R '98 KDX220 
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#3
12-21-2023, 09:14 AM
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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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#4
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.
__________________
WildAzzRacing YouTube channel Trail Riders of Southern AZ club AZ State Parks OHV Ambassador '11 EC250R '98 KDX220
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