yzf450 chain jerking?


13 replies to this topic
  • mxkid23

Posted July 05, 2010 - 12:50 AM

#1

when im in first at low rpms and i gas it i can feel the chain rubbing against something and the whole bike feels like it jerks a bit . could it be because i adjusted the sag? any ideas?

  • The Spanky

Posted July 05, 2010 - 05:41 AM

#2

If the chain is rubbing against something, then you either have a bent rear sprocket, a bent chain guide, or the rear wheel is mis-aligned.

  • ekulb14

Posted July 05, 2010 - 06:30 AM

#3

could also be your chain is to loose and when you get on the gas it snaps forward. ive noticed on some 450's if you cruise in 1st and givre a little bit of gas you do heard a snap when the chain tensions.

  • MELK-MAN

Posted July 05, 2010 - 07:33 AM

#4

yup, 4st hits every 4th revolution so low rpm will get the chain "slapping" as it goes from tight to loose.

  • mxkid23

Posted July 06, 2010 - 11:57 AM

#5

oh okay yeah it snaps a bit so is this normal?

  • WB450

Posted July 06, 2010 - 12:26 PM

#6

oh okay yeah it snaps a bit so is this normal?


If your chain is adjusted properly it is.

Post #6.

http://www.thumperta...098#post9304098

  • theuberacer

Posted July 06, 2010 - 12:29 PM

#7

yeah, especially on the big torquey 450s, at idle a fair amount of "chain slap" is normal.

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  • the white stallion

Posted July 06, 2010 - 12:43 PM

#8

And check your chain guides for wear if you hear metal rubbing and the inside of your frame.I'm willing to bet your chain is too lose.

  • shortburb

Posted July 06, 2010 - 12:58 PM

#9

Small throttle openings will give sputtery performance on the 4 strokes and you can get a tugging feeling. The bike isnt pulling smoothly.

  • FIVEWIDE

Posted July 06, 2010 - 07:07 PM

#10

sounds like you have bearing play to me, see if your rear tire moves side to side.

  • mxkid23

Posted July 06, 2010 - 10:25 PM

#11

tire doesnt move at all it tuggs a bit im going to agjust the chain a little and it should be just fine.

  • rdefonce

Posted July 08, 2010 - 09:06 AM

#12

tire doesnt move at all it tuggs a bit im going to agjust the chain a little and it should be just fine.


just be careful not to over-tighten your chain. Remember, when on a stand the chain slack should be between 1.9 - 2.3 inches.

My chain is adjusted to about 2", and I often get "chain slap" when opening the throttle at low RPM. That's normal.

  • Luigic81

Posted July 08, 2010 - 05:27 PM

#13

you running o-ring or normal out of curiousity?

  • mxkid23

Posted July 09, 2010 - 12:56 AM

#14

normal





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