WR450 Engine noise. Please diagnose. Youtube Vid Incl


31 replies to this topic
  • stev0

Posted September 20, 2009 - 01:15 PM

#21

I hope so. Id like to get the valves checked out too... maybe the shimms are worn.

  • Sider_steve

Posted September 20, 2009 - 01:27 PM

#22

I hope so. Id like to get the valves checked out too... maybe the shimms are worn.


Sounds like the bike is due for a good check up.
Check valve clearances and cam chain for stretch.
And the chain guides also the cam chain tensioner.

  • Krannie McKranface

Posted September 20, 2009 - 05:10 PM

#23

Yes, there is a gasket: it's the copper crush washer still on your cylinder.

  • stev0

Posted September 21, 2009 - 01:27 AM

#24

Update,

Cam cover off, bike at tdc...

something does look wrong...


Posted Image

Posted Image

:busted:

  • Butta

Posted September 21, 2009 - 08:03 AM

#25

Cam lobes are facing directly away from eachother.....that checks out....

What looks wrong, the alignment marks?

  • stev0

Posted September 21, 2009 - 08:54 AM

#26

The marks are suppose to be aligning @ Tdc. Cam chain is stretched.

I can probably change the chain myself, but I really dont feel like it. Should be going to the shop next monday...

Im already looking for a 2stroke replacement... ktm300 or CR/KX500 :busted:

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

Posted September 21, 2009 - 09:31 AM

#27

The marks are suppose to be aligning @ Tdc. Cam chain is stretched.

I can probably change the chain myself, but I really dont feel like it. Should be going to the shop next monday...

Im already looking for a 2stroke replacement... ktm300 or CR/KX500 :busted:


The cam chain is fairly inexpensive.
You already have the top off,all that is left to do is get the flywheel and stator out of the way.

  • stev0

Posted September 21, 2009 - 09:59 AM

#28

To be honnest, I dont feel 100 percent comfortable in doing it a first time.

Originally I thought the cam jumped a tooth, so I moved the cam one tooth forward. The stroke was heavy and I realised something was not right. I had to open the head up again and put the the cam back in its original position. This is when I found out that the YZ - WR cam timing is slightly different and the intake cam is suppose to be flat rather then slightly tilted.

  • Sider_steve

Posted September 21, 2009 - 10:06 AM

#29

Did you get a good look at the cam chain guides(dampers).

  • stev0

Posted September 21, 2009 - 10:08 AM

#30

Did you get a good look at the cam chain guides(dampers).



No I did not, should I be concerned ?

  • Sider_steve

Posted September 21, 2009 - 11:15 AM

#31

No I did not, should I be concerned ?


yes if your chain has that much play it may have worn or broken them.

  • stev0

Posted December 17, 2009 - 10:31 PM

#32

ended up being the big end... with a worn crank gear, I had to do a whole rebuild. replaced everything... valve's, crank, barrel, new piston and rings ect ect.




 
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.