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09 CRF450R with a Yoshimura RS-4 Ti/Ti repacking questions

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I have a 09 CRF450R with a Yoshimura RS-4 Ti/Ti I will be running the spark arrestor 90% of the time. My riding style is mostly trail riding and I am a novice. I have some repacking questions. On Yoshi's web site they tell you that you need to repack the pipe after every 8hrs. Has anyone gone longer or not repacked at all and if so have you had any problems? Like loss of power, pipe turning different colors or even damaging the silencer?

Edited by NateS
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