Question about Sherco 5.1i Motorcycles

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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 engenier friend put fork legs on dial to see if bent they where fine. put back togrther rode around clean paddock once loaded on ute got to ride oil dripping out.(frustrating)any help very welcome thanks

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  • nacho1619 May 20, 2011

    thanks for that porrelli Fork bushes have been replaced 2 weeks ago, no change alway use a chock. correct amount of oils is used no chips or dings this is why it's so frustrating any more ideas?

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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

Posted on May 20, 2011

  • Andrew Porrelli
    Andrew Porrelli May 20, 2011

    G'day again.
    Fork bushes replaced- plus you use a wheel chock-good.
    OK well about all I can suggest is your oil quantity spec may be wrong so set the fork oil levels at 110mm from the top -spring removed-fork fully compressed.
    This is REALLY important.
    If everything else is in order as you say- for you to be blowing forkseals like you are so frequently,the likely cause is the fork is overfilled with oil.(causes hydrolic lock- pressurising the seals).

    The only other thing I can think of is the seals your fitting are lacking a bit of tension.
    A mod I have used when fitting seals to old fork tubes is-
    1/ remove the spring from the back of the new seal.
    2/ look carefully at the spring-you'll see a join
    3/ holding each side of the join -unscrew it
    4/ the spring will come apart at the join
    5/ you will see one end of the spring is cone shaped(tapered) the other not
    6/ cut 4mm from the STRAIGHT END-(not the cone shaped-tapered end).
    7/ holding the spring ends again twist a little in the opposite direction before re-connecting the ends & tighten together.(this stops the spring twisting when you re-connect it).
    8/ re- fit the spring to the seal & lubricate the contact face with seal lubricant or fork oil.

    Effectively you have now added a little extra tension to the seal making it grip the leg a bit tighter.

    If I'm using aftermarket seals I try getting double spring seals.
    These have a spring on both sides of the seal-top & bottom-This helps keep dirt out of the seal better & stops premature seal wear.
    Well thats about all I can suggest. BE SURE OF THAT OIL LEVEL.

    Hope this helps further,
    Regards Andrew Porrelli.

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