Just bought 06' 450F: Very Converned over Engine Noise


23 replies to this topic
  • bhsballer76

Posted November 21, 2010 - 03:43 PM

#1

I just bought a 2006 YZ450F. I have been wanting one for a while and thought I found a good deal. Last week I bought a 2006 KX 450F because I couldnt find a yamaha in good shape untill this weekend.

So I get the YZ home today and I notice how noisy it it. I mean, its really concerning me. I then crank up the KX and it seems to have 4 stroke engine noise to it.

I am going to pull the top ends off both bikes tommorow. IS THERE ANYTHING I CAN LOOK FOR TO REASSURE ME THE BIKE IS OK?

play in the crank? valve clearances? cam chain tension?

Also, would the thickness of the valve shims indicate how much life is left in the valves??

I got the bike from a second owner who said he put 65 hrs on it while the first owner put 10 hrs on it. The second owner said he pulled the cylinder at 40 hrs and noticed a slight scratch on the cylinder wall and so he replaced both the cylinder and piston at 40 hrs. He said valves have never had to been adjusted.

GUYS....PLEASE HELP..the yz looks like it was maintained much better than the kx, but the kx seems to be much quieiter and smoother in terms of engine noise...I cant afford to keep both bikes, but the one I keep I plan on having for at least 3 years.. I cant afford to keep the Yami if its a ticking time bomb..

Here are videos of both.. The first it the yz.. You can hear the knocking sound much louder than on the kx, which is the second video..

http://s146.photobuc...nt=108_2312.mp4

http://s146.photobuc...nt=108_2313.mp4

  • kyle450rider

Posted November 21, 2010 - 08:01 PM

#2

I have a 2007 with 38hrs on it. My bike is noisy in the top end. It concerned me but from what I've read on TT some of the yamaha's are just like that.

  • bhsballer76

Posted November 21, 2010 - 08:25 PM

#3

I have a 2007 with 38hrs on it. My bike is noisy in the top end. It concerned me but from what I've read on TT some of the yamaha's are just like that.



As noisy as mine??lol..

  • Mr. Neutron

Posted November 21, 2010 - 08:28 PM

#4

bhsballer76,

I've read on here that bikes with an aftermarket skid plate tend to sound much noiser than they would without one. Try taking yours off, if it's an aftermarket, or a bigger offroad one, and listen if it's quieter..... There's actually quite a few threads here on that very subject. I guess when Yamaha went with the aluminum frame, the bigger/heavier duty aftermarket skid plates made the engine noise louder..... :p I'd sure look into this before I tear into the top end.....

I'm about to find out first hand the difference in noise sometime soon; I just got a ThumperTalk skid plate to put on my '06. I plan to put some sorta rubber insulator between the frame & the skid plate, in an effort to help keep it quiet.

Jimmie

  • bhsballer76

Posted November 21, 2010 - 08:32 PM

#5

bhsballer76,

I've read on here that bikes with an aftermarket skid plate tend to sound much noiser than they would without one. Try taking yours off, if it's an aftermarket, or a bigger offroad one, and listen if it's quieter..... There's actually quite a few threads here on that very subject. I guess when Yamaha went with the aluminum frame, the bigger/heavier duty aftermarket skid plates made the engine noise louder..... :p I'd sure look into this before I tear into the top end.....

I'm about to find out first hand the difference in noise sometime soon; I just got a ThumperTalk skid plate to put on my '06. I plan to put some sorta rubber insulator between the frame & the skid plate, in an effort to help keep it quiet.

Jimmie


Thanks. I will def do that since it only takes a minute to do. Its not a huge skid plate, but it is a slightly larger than stock works connection skid plate.

  • gscx

Posted November 21, 2010 - 08:35 PM

#6

They both sound the exact same to me. lol

  • bhsballer76

Posted November 21, 2010 - 08:42 PM

#7

They both sound the exact same to me. lol


yea, its harder to tell in the videos. In person the yz is much more loud in the engine.

  • grayracer513

Posted November 21, 2010 - 09:27 PM

#8

YZ450's are notoriously noisy. The first thing to do is to compare yours to another one. Most of them sound like the National School of Pipe Fitting.

  • gscx

Posted November 21, 2010 - 09:29 PM

#9

whats causing it? Is the 2010 engine just as noisy?

  • grayracer513

Posted November 21, 2010 - 09:40 PM

#10

A lot of the noise is generated by the backlash in the primary gears. They made a change in '08 to address this, but I don't know how successful that was.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • tech24

Posted November 22, 2010 - 06:47 AM

#11

whats causing it? Is the 2010 engine just as noisy?


My 2010 is considerable less noisey than my '04.

It sounds normal to me idle seems a little low too so I hear more engine than exhaust

  • Mikeb12

Posted November 22, 2010 - 09:07 AM

#12

i have an 04 that i maintain meticulously that sounds about like that. I also think your idle is a bit low which amplifies the sounds but my first reaction to your video was that it sounds like a yz450 to me.

they do sound like they have rocks rolling around in the motor but i promise, there are no rocks (or marbles) in there. i checked. that being said, i understand your fear and only a look inside will tell the tale but do know, yz motors are noisy.

  • Steel Panther

Posted November 22, 2010 - 10:52 AM

#13

my 09 sounds the same, it makes kind of a whirling noise at idle. Its been like that since the day I rolled it off the show room floor.

  • Ga426owner

Posted November 22, 2010 - 11:39 AM

#14

Yzf sounds normal to me....

  • sacfelix

Posted November 22, 2010 - 12:20 PM

#15

My 06YZ450 sounds the same way. I originally thought it was going to blow up after I put a skid plate on so I bought a can of rubber under coating and sprayed the inside of the skid plate.

  • dvn

Posted November 22, 2010 - 01:49 PM

#16

my 09 sounds the same, it makes kind of a whirling noise at idle. Its been like that since the day I rolled it off the show room floor.


+1 The skid plate definitely amplifies it. Line your frame rails where the skid plate contacts them with strips from an old inner tube. It helps.

Edited by dvn, November 22, 2010 - 03:24 PM.


  • davcon

Posted November 22, 2010 - 03:02 PM

#17

Just went out to record. Mine is noisy too. 119 hours. Timing chain changed at 90 hrs. No other top end work done except valve adjustment. Well maintained and treated.

  • Troutman

Posted November 22, 2010 - 08:35 PM

#18

My 06 was very noisy in the top end as well, very normal. That bike was as reliable as an XR 80.

  • bhsballer76

Posted November 22, 2010 - 09:11 PM

#19

Just went out to record. Mine is noisy too. 119 hours. Timing chain changed at 90 hrs. No other top end work done except valve adjustment. Well maintained and treated.




Hey, really appreciate the video. Really eases my mind . I pulled the tp end today and found a weisco piston and jug in mint condition. The guy i bought it from said he installed both at about 40 hrs.

  • jrny426

Posted November 23, 2010 - 10:01 AM

#20

My 07 sound bad too but runs great no issues





Related Content

Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.