YZ450F knocking noise - video provided

10 replies to this topic
  • chrispa

Posted June 07, 2011 - 04:22 AM


Hey guys,

I've read alot about the YZ450F and the knocking noises which are to be expected from the cylinder head...

I took a video of my 08 YZ450F:

You will hear me pull the clutch in and out and the knocking noise lowering when I pull it in (to be expected). Does this sound like your YZ450F? (ie. do I have a problem here?)

I let the clutch out at 6 seconds, pull it back in at ~8 seconds, let it go at ~12 seconds, let it out at ~15 seconds, up the revs at ~17 seconds.


  • dgcars

Posted June 07, 2011 - 04:28 AM


I don't think there is anything there to worry about. Thumpers do tend to sound louder on the stand while not wearing a helmet.

  • chrispa

Posted June 07, 2011 - 04:31 AM


thanks for the reply, can you hear the knocking sound im talking about though? Otherwise I'll take another video with the seat off maybe..

  • davcon

Posted June 07, 2011 - 05:43 AM


Doesnt sound too bad to me. Check this post.

  • Johneboy

Posted June 13, 2011 - 05:37 AM


I just bought a 2006 YZ450F this past Saturday after riding a CRF450X for almost 2 years. After getting it up to temp. and then coming to a stop I found it seems to have a knocking noise just exactly like that featured in your video. Previous owner says all he's done to it is replace the timing chain as a precaution. He told me the noise is normal and if I had s problem he'd take care of it. Sounds like it's coming from the top end with a stethoscope. I'm at a loss but would be very interested in any opinions from anybody with experience with Yamaha four strokes. Thanks.

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  • Steel Panther

Posted June 13, 2011 - 11:39 AM


My 09 sounded the exact same the day I got it from the dealer, and it still does many hours later. If you are worried which I believe you shouldnt be, check the valves and timing.

  • BlueMagiC

Posted June 13, 2011 - 09:01 PM


If youre gonna be worried about the ticking, knocking, and rattling noises 4 strokes make, maybe you should buy a 2 stroke....LoL Every large bore 4T ive ever heard or ridden makes these noises. Its just how they are.

  • Randal McSandal

Posted June 15, 2011 - 05:23 AM


Yamaha's are especially noted for doing this, even with their street bikes. My 450f has a pretty loud knock to it..

  • Duner185

Posted June 15, 2011 - 12:48 PM


I have the same problem with my YZ450F i just had to get use to it.

  • blakers213

Posted June 15, 2011 - 04:32 PM


Sounds exactly like my 09 with less than 12 hours on it. Had a Honda 450 that sounded like that too. My clutch puliing in and releasing also changes sound also. Your bike is completely normal.

  • chrispa

Posted June 15, 2011 - 11:07 PM


thanks heaps for the replies guys!

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