Yamaha YZF-R1 discussion forum:

RE: SOUND OVER 5000 RPM

RE: SOUND OVER 5000 RPM

Howiroll said 2008-08-04 05:38

It could be the exup exhaust system. There is a cable that runs to the exhaust that controls flow and I think that 5000rpm sounds about right for it to start opening. It could be the cable or the exup mechanism not working.

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