New 07 450 knocking...?

14 replies to this topic
  • climaxx dirtbikes

Posted September 02, 2010 - 10:04 AM


I changed the oil for the third time with non-syn recently and put a new aluminum skid plate on. I expected a little more engine noise but not this loud knock. Is this normal because of the skid plate. Oil level is perfect and still really fresh only 4 hrs on it.

  • WR450FGreg

Posted September 02, 2010 - 11:28 AM


They do tend to sound noisier when you fit an aluminium skid plate.


  • SXP

Posted September 03, 2010 - 11:41 AM


I'll go out on a limb here and gurantee that what you are hearing is your chain slapping on the swingarm slider. Make sure your chain is properly adjusted.

  • climaxx dirtbikes

Posted September 04, 2010 - 02:44 AM


Nah, this knock is when at idle or at any rpm for that matter with the bike not moving

  • bulldog1331

Posted September 04, 2010 - 07:16 AM


My '09 WR450 sounds like a rock crusher at idle compared to other bikes...but runs like a dream. Seems all 4 stroke Yammies are like that. I've had Yamahas for 30+ years and they all sound like that.

  • climaxx dirtbikes

Posted September 04, 2010 - 11:01 AM


Good to know. Thanks!

  • stev0

Posted September 07, 2010 - 02:48 AM


clutch basket? What the hours on your bike? Mine got a nasty knock around 500 :bonk:

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  • climaxx dirtbikes

Posted September 08, 2010 - 05:48 AM


Im not exactly sure since I havent put an hour meter on yet but not many prob 15hrs

  • stev0

Posted September 08, 2010 - 05:55 AM


drain the oil and check for shavings, just to be sure :ride:

  • climaxx dirtbikes

Posted September 09, 2010 - 02:50 AM


Will do thanks.

  • masterraptor

Posted September 10, 2010 - 02:30 AM


Mine sounds like a rock crusher too. The sticky says this is normal unless there is a big hole in the case to let rocks in.

  • mtna_buzz

Posted September 10, 2010 - 04:55 AM


I have a new 2008 (about 12 hrs) with an aluminum skid plate - with the same noise. Kind of a heavy knocking which is worse when the clutch is engaged (lever out). Took the plate off for the oil change - rode around the yard and it was much quieter.

Figure it's the normal noise- and I'll have to get used to it (or get some ear plugs!)

  • sacfelix

Posted September 10, 2010 - 05:57 AM


If you dont hear those noises than you should be worried when you own a Yamaha.LOL!

  • climaxx dirtbikes

Posted September 13, 2010 - 10:31 AM



  • chevytrkn1

Posted September 26, 2010 - 05:58 AM


Mines been noisey ever since new as soon as i put the aluminum skid plate on


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