cam chain

6 replies to this topic
  • Hamish

Posted February 16, 2004 - 02:23 AM


As I have my bike apart for gearbox rebuild I wanted to check the cam chain. On other bikes I've owned, there has been a specified maximun length for 20 links of camchain.
Amyone know what it is for the WR?? The reason I suspect the chain is that when the engine is on TDC(according to the flywheel) the cam timing marks (inlet and exhaust) sit about 1/2 a tooth above the head surface. Maybe the TDC mark is incorrect, I'll check that with a piston stop and degree wheel on reassembly.


  • thriller

Posted November 23, 2004 - 05:47 PM


I am wondering about cam chains as well. How do you know when they are bad?

  • Indy_WR450

Posted November 23, 2004 - 06:48 PM


punch marks dont line up when the chain is stretched from intake cam to exhaust cam when you check your valve clearances.

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  • yz426onNOS

Posted November 23, 2004 - 09:41 PM


The cam chain should be good for the life of the bike. My dealer has never had one ordered or replaced one.

  • PowerFiend

Posted November 23, 2004 - 10:39 PM


Replacing the chain is cheap insurance. Better safe than sorry.

You can also tell how worn/stretched a chain is by how much travel is left in your cam chain tensioner. If your adjuster is maxed the chain can jump teeth, and that leads to bent valves, etc.

  • SteadyEddy

Posted November 24, 2004 - 12:48 AM


Hey hamish,
How many times have you had to rebuild that gerabox now :cry:

  • Hamish

Posted November 24, 2004 - 02:07 AM


Hey hamish,
How many times have you had to rebuild that gerabox now :cry:

Just the once, which was about 6 months ago.
Going to do the head soon as I managed to score a set of aftermarket Ti valves for pre release testing. I'll post the results when it's all done.


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