Front Axle Nut Failure - 2009 YZ450F


4 replies to this topic
  • sro2004

Posted July 04, 2010 - 07:04 PM

#1

So I hear a POP (mechanical) from my bike, so I start looking around. Front axle nut blew out it's threads. I guess the torque specs in the manual may be a bit aggressive...

Wow...crazy failure. Thank god for pinch bolts, and that I heard it go. That could've been ugly.

  • schrode

Posted July 04, 2010 - 07:10 PM

#2

sounds over torqued to me. are you sure you torqued it correctly?

not sure if you know but you should start with a torque setting roughly half of what you want it to be at the end and work up to final torque, when the wrench is cold, i.e. hasn't been used in a day or two. the thing is there are moving parts in the wrench that need oil, the wrench is self-oiling but if it hasn't been used in a while you need to get it moving through the parts so that the calibration is accurate and that you get an accurate reading, i.e. torque click.

idk if this is the case but it is the first thing that came to mind

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  • nwbikerider

Posted July 04, 2010 - 09:30 PM

#3

sounds over torqued to me. are you sure you torqued it correctly?

not sure if you know but you should start with a torque setting roughly half of what you want it to be at the end and work up to final torque, when the wrench is cold, i.e. hasn't been used in a day or two. the thing is there are moving parts in the wrench that need oil, the wrench is self-oiling but if it hasn't been used in a while you need to get it moving through the parts so that the calibration is accurate and that you get an accurate reading, i.e. torque click.

idk if this is the case but it is the first thing that came to mind


Tell this to my digital Snap-On Tech wrench. The aluminum nut is not that sensitive to a fraction of a Nm that a "cold wrench" will vary. What it is sensitive to is the 105 Nm or 75ft lb of torque the manual calls for. Probably an error or carryover from when it was a steel nut, not an aluminum one. Unless the thread was deleted, this was discussed a bunch.

  • mdkcrf250r

Posted July 05, 2010 - 01:36 AM

#4

yup definitely been discussed plenty. Your local Yamaha shop has the right torque spec ask them for it.

  • sro2004

Posted July 09, 2010 - 11:09 AM

#5

So my local Yamaha dealer didn't have stock on this very common nut (2003 - 2009 all YZ's and WR's). I ended up getting it from Honda which uses the same nut on <2005 CR's. Paid a few bucks extra...but HEY...IT'S HONDA...IT'S HIGHER QUALTITY AND WILL LAST LONGER! :)

Had the Honda parts guy look up the torque specs...55 ft/lbs. The 75 ft/lbs in the Yami manual be wrong.





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