Question about 2006 Yamaha XT 660 X

3 Answers

I have a 2002 660 Grizzly with about 800 hours on it. It runs fine, but takes high RPM's to get moving. I have checked the variable sheaves for ridges but everything looks fine. I am using 10w - 40 Castrol as my engine and clutch fluid. Any ideas what I am up against

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  • philpersson Jul 08, 2010

    The clutch is non adjustable--it comes as a
    packaged unit inside the crankcase. One further
    detail about the problem is that when I got it, gas had slipped into the crankcase and completely permeated the oil. I did change the oil a couple of times but am wondering if this created a glaze on my clutches that can only be remedied by replacement.

  • philpersson Jul 09, 2010

    let's get a few bits of information cleaned up.
    My problems are with a 660 Yamaha Grizzly four wheeler not motorcycle. Also, these have no sprockets to modify. Is there someone out there who owns one or has worked on one with this problem,(and knows how the clutches function) that can give me some good advice!

  • philpersson Jul 09, 2010

    the solution is not really helpful. Obviously, no one who commented has a Grizzly or has studied one up close. I have no clutch cable on mine! Anyway, I will get some further advice at a Atv shop. Thanx for the effort!

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3 Answers

Check your clutch cable and adjust it so your clutch will engage in lower RPM's, replace the cable if it will no longer adjust. If you replace the cable and it still takes higher RPM to get it moving then you will need to replace the clutch

Posted on Jul 09, 2010

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  • Master
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Hi these are high revving bikes anyway, there are 2 mods you can make to it that will make it a whole lot better, first replace the exhaust with a better one, the one that is on is very restrictive, and i have spoken to a few friends who have these and they say the first thing to go is the exhaust, then there's the rear sprocket change this for a larger one, you will find you need less rpm and you will get allot more torque from the rear wheel...hope this helps you

Posted on Jul 08, 2010

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  • Master
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Sounds like the clutch needs to be adjusted if that is possible. The hi revs indicate too much slippage.

Posted on Jul 08, 2010

  • 3 more comments 
  • Duane Wong
    Duane Wong Jul 08, 2010

    Sounds like if gas entered the 10w40 oil that it could contaminate the clutches and change the linings. However, I thought you said you looked at them and didn't find anything wrong.



    The measurement of clutch lining is rather thin, as thin as cardboard.



    Also, is there a spring in there that needs to be replaced when changing the clutch?



    Just trying to help.



    good luck to you.



  • Duane Wong
    Duane Wong Jul 08, 2010

    In a car clutch, I know there is a pressure plate that when released allows the clutch to be free and allows you to change gears



    Is there a pressure plate with springy fingers on this motorcycle en miniature?

  • Duane Wong
    Duane Wong Jul 09, 2010

    You're right, I haven't studied the Grizzly up close until now discussing the problem with you.

    It seems like a rare vehicle.

    I was thinking it was a dirt bike based on the picture on your page. But, that's just a generic picture provided by FixYa.com.





  • Duane Wong
    Duane Wong Jul 09, 2010


    So, your yamaha would look something like this?



    I admit I was thinking you had a bike.

  • Duane Wong
    Duane Wong Jul 09, 2010


    So it looks like this, not a motorcycle?

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