01 cr250 fork oil level question

8 replies to this topic
  • vrswiss

Posted March 04, 2008 - 07:09 PM


I'm not getting much help in the suspension forum so I figure I would try you guys.

I had my 01 250's forks revalved by pro pilot for a 220 LB rider last year. When they did the revalve they also added stiffer springs. I now need to replace the seals and I am wondering how much fork oil I should add? From what I understand the amount of oil will affect the performance of the forks. Should I go with the recomended amount in the shop manual or more since they were revalved for a heavier rider? Any ideas on this would be great as Pro Pilot will not respond to my emails. Thanks

  • kuritaro9

Posted March 04, 2008 - 07:23 PM


stock setting: 383cc of oil in the outer tube and 180 cc in the inner chamber (before bleeding)...:thumbsup:

  • vrswiss

Posted March 05, 2008 - 05:17 AM


Thanks for the information. I am guessing the standard 5w oil would be the way to go.

  • rpt50

Posted March 05, 2008 - 07:06 AM


Use 5W. Start with the highest level, and then remove some if the forks feel harsh.

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  • moto9

Posted March 06, 2008 - 11:21 AM


I would start with the factory minimum in the outer chamber because easier to add oil then remove it.
at your weight if you do a fair amount of jumping I think you would benefit from bottoming collars...it stiffens the last 3 inches of travel.

less oil = a little more plushness but you loose bottom resistance.

at the factory minimum setting take some easy laps and get up to speed slowly.
if you feel it bottoms to easily add 5cc at a time in each leg thru the bleed screw and test... pick up a sryinge from a pet store.

it's normal to bottom about once a lap on a decent track with jumps.

  • 36MotoMarc

Posted March 06, 2008 - 11:59 AM


Usually, when installing stiffer springs, qa company will go with less than stock. It will provide smoother less harshness near the end of the travel. Try 350-360cc. You can add more if you need to, to fend off bottoming.

  • vrswiss

Posted March 06, 2008 - 07:12 PM


Thanks for all the great advice everyone. It does make sense that there should be less oil with a stiffer spring. I'll start low and add oil as needed.

  • Lehiguy

Posted July 02, 2014 - 05:24 PM


Increased oil volume makes the last portion of travel stiffer simply because the extra oil makes the air pocket smaller.  You have a spike in the internal pressure because you are compressing all of the air inside the fork into a smaller space.  Less oil equals more space and less pressure.  It does not affect "dampening" per se, that remains constant.  Air is pretty much a perfect spring, so it's sort of like an increased spring rate at the end of travel.   Softer springs and higher oil levels are a good off-road setup because of the initial plushness and bottoming resistance at the end of travel.


Posted July 03, 2014 - 02:26 PM


Much much much easier to add oil than remove. :thumbsup:

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