Question about 2003 Yamaha YZF 600 R thunder cat

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Replacing the front seal- located on the fork.



I seem to have damage the front seal on the fork and bought one buy don't know how to change i. can you assist

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Get a manual if you are going to take the fork all the way apart as there are alot of pieces inside. If you are just replacing the seal, you will need a way to remove the old seal without damaging the fork. Sometimes a pick or screwdriver will work. Then you will need a tool to drive the new seal in. You can find out what size forks you have, and buy a seal driver for it.

Posted on Jun 29, 2009

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To replace the fork seal you must open the top of the fork and remove the spring. Then drop the fork tube out of the clamp. Once the fork tube is removed replacing the seal is simply pulling the old one off and putting the new one on. You will need to remove your front wheel.

Posted on Jun 29, 2009

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Keep having leaking fork seals.have replaced seals and oil after every ride lately.(4)have tried two brands of seals last time disasembled whole of forks cleaned every part,shims everything and had...


G'day. A couple of suggestions-
Damage to the fork slider-chips or dings.
Too much oil in the fork on re-assembly can cause the seal to go.
Worn or loose fork bushes will flog the seal prematurely.
When you transport the bike-if you don't use a seal saver can pop the seals.

So let me help with these.

Be sure that the fork slider is not scored,dinged or damaged on th surface.

A good double check of the oil quantity is to ensure that when you have re-filled the tube with oil & primed it(worked the air out of it), the oil level should be 100 to 110 mm from the top of the leg to the oil with the fork fully compressed. If the level is less than this-drop it to 100mm.

To check the fork bushes-try pull on the front forks front to back(wobble) & feel for looseness in the bushes.

And finally-When you transport the bike-put a chock(I use an empty 5ltr oil container-but you can buy propper chocks from the bike shop) in-between the forks at top of the front wheel .
Now when you pull the front end down it will stop on the chock & stop the front forks being under excessive compression for extended periods-so it saves the fork springs from sacking out too.
I hope this proves helpfull.
Kind regards Andrew Porrelli

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1 Answer

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3 Answers

How do I change the fork seals on a 2008 Honda CRF 250 r? Do I use a special tool? Oil? How much oil? Thanks so much for your expertise. Do I put equal amounts of oil on each side? Inner tube- outer tube?


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