Cylinder play/tightness

6 replies to this topic
  • nnamssorxela

Posted October 13, 2010 - 01:31 PM


Well my desktop computer crashed with a virus as I was trying to post this last time so I'll just keep it short and sweet this time...

I was removing the head from my 1998 wr400 when I noticed that as I pulled up on the cylinder a small (1mm or so) gap appeared at the bottom of the cylinder on the right side opposite the bolt that holds it on. As soon as I release my grasp the gap went away. I was pulling to move the exhaust over as the nut on the exhaust was just spinning the threaded rod it was on, and I needed to take the head off before I could get it off anyway.

Here are my questions: Since only one bolt holds the cylinder on, is this gap normal? Should I replace the bolt as a precaution to the fact that my pulling could have weakened the bolt and that it might break later down the line? If I replace the bolt, should I replace the gasket too?

I'm a little paranoid when it comes to the small things, and I don't have the time or money to pull the head again should I get it back together and something is wrong with the cylinder.


  • nnamssorxela

Posted October 14, 2010 - 07:27 PM


Surely someone has had their motor apart and noticed this or has worked on enough motors to know the answer.

  • nnamssorxela

Posted October 16, 2010 - 12:29 PM


Talked to my local shop and they said that it was normal but that I should definitely replace the gasket should anyone find this post in a search and want an answer. Is it possible to remove the cylinder and compress the rings by hand to put it back in, or do I need the tool?

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  • Flagstaff

Posted October 16, 2010 - 10:10 PM


Got my '06 in by hand, no problem, don't understand " one bolt ", my bike has one bolt each side, as I remember. Always replace gaskets.

  • nnamssorxela

Posted October 17, 2010 - 02:08 PM


This cylinder is only held on by one bolt on the left hand side, and this is confirmed by the manual. As it sits, I can push down on the right side and close the gap that is at the base of the cylinder. I'm wondering if a new gasket will change that or if it is normal? Nothing leaked before, but I'm not sure how that the cylinder is suppose to get a tight seal with only one bolt? I might as well pull it apart and replace the gasket since I have it this far apart anyway. I'm inclined to get a new bolt as well...
Thanks for the insight,

  • miweber929

Posted October 18, 2010 - 04:38 AM


On something like a cylinder, you need to tighten both all sides in a cross-cross pattern as well as removing them the same way in stages. Manual should indicate this as well to stop warpage and create a correct, even seal.

Never fully loosen a sealing bolt whole leaving the opposite one fully tightened. Hopefully if this is what you are describing there is no permanent damage done.


  • Flagstaff

Posted October 18, 2010 - 08:33 PM


Mine's an 06, sorry.


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