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مرحبًا ، أرجو المساعدة. لدي دراجة ياماها 4D9. عند بدء تشغيل المحرك ، عند بدء الحركة ، سيبدأ صوت الطرق في الخلف وعندما تزيد السرعة ، سينخفض مستوى الصوت.Hi, please help. I have a Yamaha 4D9 bike. When you start the engine, when you start the movement the sound of the knocking in the back will start and when the speed increases, the volume will decrease.
 

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American Legion Rider Staff Administrator
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Long shot here but just guessing since we can't actually hear it, how about the possibility of a bad wheel bearing?
 
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