Cam mod...Half ring dropped in the engine

8 replies to this topic
  • Sylvain

Posted April 03, 2005 - 06:58 AM


:naughty: :D :D :D

I did it. I read I had to take extra care when taking off the cam cap to prevent the half ring from falling in the engine. But I think it didn't register well enough. Anyway, I'm in the process of finishing the YZ450 cam mod on my WR, and the F***g half ring dropped in the case.
I'm sure it must of happened to some of you. I hope I'm not alone :cry: .

I can't see the half ring in the engine.

Simple questions:

How the hell did you get it out without dismantling the engine ?

I tried to fish it out with a magnet, but so far no success. Is this half ring magnetic ?

Any other suggestions? I considered laying on a rail track and waiting for a train to come, but may be there is a way to get this half moon piece without going to such extrem ?

Thanks :naughty:

  • mtrablue

Posted April 03, 2005 - 07:17 AM


pull the ignition side cover. if your not looking right at it, pull the flywheel. that area is the "bottom of the hole", so to speak.

  • Birdie426

Posted April 03, 2005 - 08:57 AM


I did the same thing, but was successful with a magnet on a stick. A pretty powerful one, though. Pulling the ignition side cover might help as well, as it will let light in from the bottom. You might try moving the cam chain around a little, too, just in case it's hiding the half ring.

  • Math

Posted April 03, 2005 - 04:42 PM


Sorry to hear your magnet did not help so far.

Mines are on the bench at the moment so I just checked if they can be attracted by a magnet and they sure are.

Hope you'll find it! The train is not an option :naughty: You're the most serious riding partner I have within 250 Km! Give me a call before you do that :D :naughty:

If you have to open the beast, give me a call, I'm getting quite experienced! :D

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  • BlueDragon

Posted April 03, 2005 - 08:28 PM


Keep trying the magnet, got mine out!

Sounds like a lot of cam work going around. Problems too! I was changing the YZ timing back to WR timing and while I was rotating the cam, (which was kind of a beast) I must have changed too many teeth because now the "E" and "I" aren't flush or at the 3 and 9 o'clock positions like the picture shows in my manaul when the engine is TDC. :naughty: I would need to rotate the exhaust cam one tooth clockwise, and the intake cam two teeth counter clockwise to match the pictures. I already rotated the piston from TDC before I noticed. Can I just find TDC again, re-align the cams like the pictures show, and re-cap and torque? Or am I now "out of adjustment" with the valves?
I don't want to start my bike until I know it's correct. :D

Anybody know what I can do? :naughty:

  • Math

Posted April 04, 2005 - 05:47 AM


Slack the chain, put the engine at tdc, remove cam caps, readjust the cams at the desired position (with the E and I marks) making sure you are at tdc, reinstall the cam caps, check valve lash making sure you are at tdc. You should be done.

  • BlueDragon

Posted April 04, 2005 - 12:44 PM


Math, Whats valve lash?

  • Frostbite

Posted April 04, 2005 - 01:34 PM


Math, Whats valve lash?

Valve lash is the clearance between the cams and the buckets over the valves, valve clearance.

  • Math

Posted April 05, 2005 - 05:27 PM


Valve lash is the clearance between the cams and the buckets over the valves, valve clearance.

Thanks Frosbite :naughty: Exact! I meant to make sure the valves are adjusted to specifications.


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