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  1. #1
    Moderator beerdart's Avatar
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    Les Cooke Valve Retainers?

    Been reading up on the retainers and shims and I have a few questions.

    1. Can the shims be installed without removing the head?

    2. Are the shims necessary with stock springs and 8600 RPMs?

    Thanks


  2. #2
    Moderator Snoman's Avatar
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    Steve,

    I have the Les Cooke retainers and we didnt have to install any shims..And Yes you can run his retainers up to 8600+ on stock springs..And No you do not have to remove the head..

  3. #3
    R88ory RXP's Avatar
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    Quote Originally Posted by beerdart View Post
    Been reading up on the retainers and shims and I have a few questions.

    1. Can the shims be installed without removing the head?

    2. Are the shims necessary with stock springs and 8600 RPMs?

    Thanks
    No shims with Les Cookes retainers that is with the rotax 1s.

    No need to remove the head if you have the riva install tool.

    With Les's retainers you are good to 8600, although depending on hours you might look at replacing the stock springs for a new set. If this is the case I would prob just go with the Riva kit. Im going to do my valve train this winter, I have 117hours on my springs now and wouldnt trust them at higher RPM with just retainers so im going with the riva Kit and having my valves lightened.

    1 thing to consider tho with the riva kit is that it can cost you a little power due to the springs being higher rated and being harder for the engine to compress. Real small details here tho. R88

  4. #4
    Moderator beerdart's Avatar
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    Quote Originally Posted by Snoman View Post
    Steve,

    I have the Les Cooke retainers and we didnt have to install any shims..And Yes you can run his retainers up to 8600+ on stock springs..And No you do not have to remove the head..

    Thanks I have been reading that in order to install the shims you need to removes the stem seals which is PITA with the head installed. The stock springs have 25 hours so they should be good to go.. I have the Riva tool on loan from CTriverguy.. Thanks

  5. #5
    Moderator Snoman's Avatar
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    Quote Originally Posted by beerdart View Post
    Thanks I have been reading that in order to install the shims you need to removes the stem seals which is PITA with the head installed.

    NO.No need to remove the head nor the stem seals...

    The stock springs have 25 hours so they should be good to go..

    Yes, they will be fine...

    I have the Riva tool on loan from CTriverguy.. Thanks


  6. #6
    Moderator beerdart's Avatar
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    So you do not have to remove the seals to install the shims?? Should we install the shims then??

  7. #7
    Moderator Snoman's Avatar
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    Quote Originally Posted by beerdart View Post
    So you do not have to remove the seals to install the shims?? Should we install the shims then??
    NO shims with the retainers..I dont know were you got shims from but with the Les cookes you dont use shims..No shims,no seal removal...

  8. #8
    Moderator beerdart's Avatar
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    Quote Originally Posted by Snoman View Post
    NO shims with the retainers..I dont know were you got shims from but with the Les cookes you dont use shims..No shims,no seal removal...
    James got the shims with the retainers I think Ill find out tonight..

  9. #9
    Gus13letter's Avatar
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    Sno has you on the right track. Don't forget to hook up the air hose to each spark plug hole for the cylinder you are working on or the valves will drop. Using a small flat tip screw driver that has been magnetized will also help with those pesky half moon retainers.

    My Riva valvetrain upgrade kit came with shims but we didnt use them.

  10. #10
    Fast & Loud meeper's Avatar
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    you dont need shims with the les retainers because his retainers are shaped differently than stock as to put more tention on the spring therefore no need for the shims. riva includes shims because there lightweight retainers are same shape as stock

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