Whistle noise on hard throttle on a yz450f

2 replies to this topic
  • mattyd1977

Posted January 10, 2009 - 06:15 AM


Has anyone encountered a weird whistle noise when accelerating hard on a yz450f, it can be heard when blipping the throttle when stationary or on the go.I wasnt able to find any thing on a search.
The intake seems to be sealing fine and a mates wr450 does the same.

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  • yzfjbw323

Posted January 10, 2009 - 06:53 AM


YEP..It is the exhaust..

  • gtxkid

Posted January 10, 2009 - 07:34 AM


I just fixed mine.
I had to take the header pipe off and looking threw it from the inside i seen a small hole / crack.
The aluminum mounting flange that holds the pipe on was covering it up.

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