Cylinder Works BB kit help

3 replies to this topic
  • Aztechooligan

Posted July 26, 2016 - 03:48 PM


Trying to install a cylinder works big bore kit for my 450, cylinder and piston are for a YZ450 but the package the rings came in said they were for a CRF450R. There are only 4 rings (top and oil rings) however every service manual and my old piston shows there should be 5 rings.

I contacted cylinder works and they assured me their pistons only use those 4 rings and not 5 like the OEM piston.

Does this seem right to anyone?

  • billygildark5007

Posted July 26, 2016 - 04:16 PM


Yep, especially if that's what they say. Some gytr pistons are 4 rings as well.

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  • stevethe

Posted July 26, 2016 - 05:40 PM


Top ring is a compression ring.
Bottom ring is a three piece oil ring.
Put it together and ride.

  • Aztechooligan

Posted July 26, 2016 - 06:15 PM


Thanks guys

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