Front Sprocket nut wont stay tight

10 replies to this topic
  • 2001YZF426Rider

Posted July 23, 2006 - 02:36 PM


On my 2001 426, the front sprocket nut wont stay tight, it always comes loose while we are riding, but it never comes off... Anyone have any ideas... Actually now that i think about it, i dont think there is the washer between the nut and sprocket, that could be the reason right? If so, where can i get a washer for that?

  • mpl239

Posted July 23, 2006 - 04:23 PM


My 01 426 has an eared washer, that bends over a flat on the nut. A stock item, kinda like safety wire. See the dealer.

  • Zique

Posted July 23, 2006 - 04:56 PM


Yes, there is supposed to be a lock washer that fits over the teeth of the drive shaft then bends on one side to prevent the nut from backing out.

Yamaha OEM Part #90215-21001-00
Approximately $2.52 at your local dealer.

  • 02YZ426

Posted July 23, 2006 - 05:55 PM


You definatley need to get that washer... thats why its there, to keep the nut from backing off.

  • hedpi

Posted July 23, 2006 - 07:21 PM


yeah i had that problem on my YZFR6 because the washer wasnt there, i got the washer, problem gone..

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  • 2001YZF426Rider

Posted July 25, 2006 - 06:00 PM


Well the dumbass that i am, when i put on a new front sprocket, forgot to put that washer back on, so i put it on and made sure it was folded over the nut, not going anywhere now! Right after i made the post i remembered i didnt put the washer on and went out in the garage, found it and put it on. Thanks for the help!

  • 2001YZF426Rider

Posted July 29, 2006 - 02:16 PM


Well guys, i bent the washer over the nut, but not on every side, and it still came loose, should i bend it over the nut everywhere so then it cant come loose?

  • yogist

Posted July 29, 2006 - 03:03 PM


This is the reason you need a manual....Buy the manual , please.......

  • Diode663

Posted July 30, 2006 - 09:06 AM


You need to tighten the nut more, the washer is only there to keep the nut from backing off completely if it does come loose.

  • 2001YZF426Rider

Posted July 31, 2006 - 03:34 PM


This is the reason you need a manual....Buy the manual , please.......

I already have the manual, i know what i am doing. I am baffled why The damn thing isnt staying tight.. We put a socket wrench on it and then hit the wrench with a hammer to get it tighter, havent rode it since we did that so i dont know how it will hold up.

  • Blue4Ever

Posted July 31, 2006 - 03:47 PM


You will need to hold the back brake on while you thighten the nut, i beleive it should be thightened to approx. 54 ft.lbs. Then flod the washer over one of the flat sides(not on one of the pointed ones.

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