Valve buckets wont come out

7 replies to this topic
  • GCannon

Posted August 11, 2005 - 02:21 PM


[COLOR=Black]undefined[/COLOR]I was adjusting the valves on my 2002 WR 426 and the intake buckets will not come out. The cylinder head material adjacent to the intake valve bucket is mushroomed out by the camshaft I guess since this is the cam bearing surface. I got two of the buckets out by slicing off the mushroomed lip with an exacto knife and then the valve bucket pulled straight up easily. It looks like I may have to remove the cylinder head to get the center bucket out. I use Torco T4R oil and change often and never go low on oil. Has anyone seen this problem what is the cause and what is the fix. the bike runs very strong with no engine noise.

  • SMWRF88

Posted August 11, 2005 - 02:54 PM


It's happened to my 250's also. I had no "mushrooming" like you described. I got mine out with a magnetic pen and a scribe.
Good luck with it.

  • endurodog

Posted August 12, 2005 - 12:15 AM


I had this happen to my bike. A local engine shop had to get mine out. The head is severly damaged when it gets to that. I went with a new head, very pricey and my cam need to be replaced also. I did the rebuild work and it was still around $750.

  • Spadman450

Posted August 12, 2005 - 07:08 PM


If it is not too tight try rare earthmagnets. Seriously....

They are great in drain plugs, etc., also.

Don E

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 5valve

Posted August 13, 2005 - 01:13 AM


it happened to me
some mech overtightened the cam caps or so it seemed
cam rotation edges on the head got squeezed, so I couldnt pull the center intake bucket out
had to remove the head and cut out those edges
than used 1000 sandpaper to repair the cam sliding area till cam rotated freely when torqued correctly

Posted Image

  • scott_h

Posted August 14, 2005 - 09:54 PM


GCannon, can usually refurbish this type of damage to like new condition for about 100 bucks. They do quality work and I highly recommended their services.

  • TeamScream

Posted August 27, 2005 - 09:59 PM


GCannon, can usually refurbish this type of damage to like new condition for about 100 bucks. They do quality work and I highly recommended their services.

Heard a lot of good things about them actually....good call.

  • GCannon

Posted August 29, 2005 - 12:29 PM


Here's what happened Possibly during the last valve adjust the cam cap was not torqued correctly annother problem was the cam cap allignment sleeve in the right rear corner got hung up nat allowing the cap to fully seat. The fix is to repair the alignment sleeve and seat it in the head clean the cylinder head cap mounting surface with a wet stone. Clean the cam caps with a wet stone. use a wheel cylinder hone to make the cam wear surfaces round and smooth clean everything and reinstall head and cams with lube. Adjusting Valves with the cylinder head on the work bench is great. Then retorque the cam caps very carefully.


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