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Loud squealing/whistling in the head

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So I took my 07 rmz450 out yesterday for the first time this year and it worked fine for first 3 hrs, then I noticed a low pitched whistling. I was deep in the trail so I couldn't stop plus there was no loss in performance. Once back the noise stopped, but when I restarted the bike it was now a load squealing noise. It was coming from the left side around the cam area I think. Has anyone else experienced this? My buddy said maybe a cam bearing? Any input would be appreciated.

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It sounds like the cam journal. Possibly the bearing but usually when the journal starts to seize it makes that kind of noise

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