Exhaust header tightening

2 replies to this topic
  • slodog

Posted December 14, 2010 - 09:36 AM


What's the best way to tighten the header on a 2009 YZ450F? Neither the bolt nor nut allow enough clearance to tighten with a standard socket and allen socket using a 3/8" drive and torque wrench.:thumbsup:

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  • grayracer513

Posted December 14, 2010 - 10:31 AM


I have no idea why you would need to use a torque wrench on the header. I use a 6mm T handle and a 12mm combination wrench to tighten mine. I first snug both fasteners while watching the flange plate to see that it sits flat, square with the face of the port, then I turn down the Allen 1/3-1/2 turn. After that, I crank down the hex nut until the flange squares up with the ring on the header. When using a new OEM gasket, you may need to tighten it a bit more to allow for the additional crush, but in either case, tightening the Allen first stresses the threads in the head less.

  • slodog

Posted December 24, 2010 - 06:55 PM


Thanks, that's what I ended up doing.

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