99 yz400f front sprocket help

4 replies to this topic
  • beercan

Posted July 17, 2011 - 06:05 PM


i was hoping someone might know if the nut holding the front sprocket on. on my 99 yz400f is reverse threaded or regular threaded any help would be great because it doesnt move either direction:banana:

  • baxterj787

Posted July 18, 2011 - 06:17 AM


Normal thread. CCW to remove. Try applying some heat, as a lot of these see loctite in addition to the fold-up type lock washer.

I do not remember what size it needs, but it is "big" (27-30mm range).

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  • beercan

Posted July 18, 2011 - 02:09 PM


thank you that is very helpfull. it still dont move but at least i know im trying to loosen it in the right direction. ill get it eventually

  • Schpenxel

Posted July 18, 2011 - 05:13 PM


BFH should take care of it!

  • 1991CR250RBEAST

Posted September 06, 2011 - 10:01 PM


Spray it with pb blaster and let it sit over night then try using a breaker bar or cheater on your socket wrench.

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