Fmf mega bomb header

4 replies to this topic
  • WilfulLemar20

Posted March 19, 2015 - 07:31 AM


Okay I have a 04 yz450f and it has a fmf mega bomb header, now where the header attaches to the head of the engine it has a flange that bolts on but it does nothing to hold the exhaust on the head, there are 2 springs that hold the header it's self in place. Are the springs really the only thing that hold this together I will get pics after work to better describe thanks

  • WilfulLemar20

Posted March 20, 2015 - 11:51 AM


Anyone have any ideas on how these headers are suppose to be mounted

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  • jcm3

Posted March 20, 2015 - 12:15 PM


Usually the flange is part of the header and is above the part that is expanded, like the pic below so that tightening the flange pushes the header up onto/into the exhaust opening.  :confused:



I know that's not the same year pipe.

Edited by jcm3, March 20, 2015 - 12:16 PM.

  • grayracer513

Posted March 20, 2015 - 12:44 PM


Not on the FMF.  The flange is a separate part that bolts into the exhaust port.  The pipe then slips into it and is held there by springs attached at two points on the pipe and up to 4 on the the flange.  (See arrows)

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  • WilfulLemar20

Posted March 20, 2015 - 02:13 PM


Okay that's a relief thought it broke as it has a couple dents on the bottom I will be buying new springs anyway these have seen better days

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