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Thread: Yamaha FZS400 engine rattle

  1. #1
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    Yamaha FZS400 engine rattle

    Hey guys.

    My bike has got a bit of an engine rattle that I'm a little concerned about. It's a constant rattle that is associated with the engine speed (ie more revs = faster rattle) but it only rattles when I'm in nuetral or if the clutch is in. As soon as I start to let the clutch out, the rattle disapears. The rattle is not particualy loud and seems to be coming from the front of the engine, though I cannot pinpoint it exactly. Any thoughts?

    Ta

    FB
    There is no try. Do, or do not do.

  2. #2
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    Cam chain(s)
    "Standing on your mother's corpse you told me that you'd wait forever." [Bryan Adams: Summer of 69]

  3. #3
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    cam chain -or maybee loose clutch basket
    To see a life newly created.To watch it grow and prosper. Isn't that the greatest gift a human being can be given?

  4. #4
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    Quote Originally Posted by Fazer Bloke
    Hey guys.
    The rattle is not particualy loud and seems to be coming from the front of the engine, though I cannot pinpoint it exactly. Any thoughts?
    How many ks has the bike done? May not be a major problem at all. After a few thousand ks motors do rattle a bit because of component wear blah blah. Use a long handled screw driver, put the blade on the engine an your ear to the end of the handle. This should give you a better idea where the rattle is. Have you had a carbs balanced/tuneup lately?

  5. #5
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    Carbs were cleaned/tuned last week. no change. Thanks for the other pointers, guys. I'll take a look at those.

    FB
    There is no try. Do, or do not do.

  6. #6
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    Quote Originally Posted by Fazer Bloke
    My bike has got a bit of an engine rattle that I'm a little concerned about. It's a constant rattle that is associated with the engine speed (ie more revs = faster rattle) but it only rattles when I'm in nuetral or if the clutch is in. As soon as I start to let the clutch out, the rattle disapears. The rattle is not particualy loud and seems to be coming from the front of the engine, though I cannot pinpoint it exactly. Any thoughts?
    Yeah, I've got some thoughts.
    It's f*cked!
    But you've got a few options -
    1. Buy some earplugs
    2. Smash out the endcaps so you can't hear the noise
    3. Take the mufflers off so you can't hear the noise
    4. Set fire to it, blow it up, leave it in a ditch or otherwise get rid of it.
    ... and that's what I think.

    Or summat.


    Or maybe not...

    Dunno really....


  7. #7
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    25th March 2004 - 17:22
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    Hey, you’re quite a guy. And real funny too. Haha,

    buy a car dribbledick.
    Don't you look at my accountant.
    He's the only one I've got.

  8. #8
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    Quote Originally Posted by F5 Dave
    Hey, you’re quite a guy. And real funny too. Haha,

    buy a car dribbledick.
    Not as funny as you thow, dickface!

    And I've got a car already thanks. An M3.
    ... and that's what I think.

    Or summat.


    Or maybe not...

    Dunno really....


  9. #9
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    25th March 2004 - 17:22
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    I wouldn’t know what that was, so if you are boasting it makes no rub.

    From your spelling I suspect you are 15.
    Don't you look at my accountant.
    He's the only one I've got.

  10. #10
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    Boys! Boys! Stop squabbling and take the squabble outside.

    You're spozed to be helping one another!

    Why can't we all live in peace.....
    ... and that's what I think.

    Or summat.


    Or maybe not...

    Dunno really....


  11. #11
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    I just had another thought. Try running the bike on 98 octane. Unlikely by your description but it could be just pinking away in there
    To see a life newly created.To watch it grow and prosper. Isn't that the greatest gift a human being can be given?

  12. #12
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    Quote Originally Posted by XJ/FROSTY
    I just had another thought. Try running the bike on 98 octane. Unlikely by your description but it could be just pinking away in there
    Funny you should mention that. I filled up on 98 on Friday as I've been having a few starting problems. She starts a hell of a lot more easily now, but the rattle is still there. I took her in to Coleshot (yes I know they're Suz dealer, but they are very close to where I work), and asked one of the mechanics to have a listen. He reckoned it was normal engine noise. Still not convinced though. My vote it going on cam adjuster stuck. How easy is it to tweak these things? Anyone tried it? I've tended to shy away from anything vaugely cam related rather than risking completely fucking the engine

    FB
    There is no try. Do, or do not do.

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