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Thread: Tight Valves - Symptoms?

  1. #1
    Modding the Motor Alkire193's Avatar
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    Question Tight Valves - Symptoms?

    I've been reading as much as I can about valve seating, tight lash/loose lash, negative preload. I learned that having your valves too tight can cause a LOT of problems, and depending on how tight they are, it can even be catastrophic.

    Im looking for anyone that has had an issue with their valves to explain how it effected their raptor
    Last edited by Alkire193; 10-17-2009 at 03:37 AM.

  2. #2
    Modding the Motor CalledFollower's Avatar
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    On my 660, when the intakes start tightening up, it got hard to start. I had to give it some throttle for it to fire.

    Its the same thing on my CRF bike. Being hard to start is the first indication that your valves are moving.

  3. #3
    Bolt-on Beginner bueller's Avatar
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    Quote Originally Posted by CalledFollower View Post
    On my 660, when the intakes start tightening up, it got hard to start. I had to give it some throttle for it to fire.

    Its the same thing on my CRF bike. Being hard to start is the first indication that your valves are moving.
    What ^^he^^ said.

    Hard starting is usually the first sign.
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    Modding the Motor ccdhowell's Avatar
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    Yep, hard to start. I have 7 4stroke quads, and you can always tell when the valves need adjusting on one, they get harder to start. (Yeah, I adjust a lot of valves.) I try to catch it early in the process. Normally all of my quads start with the touch of the start button and no throttle. As the valves start to get a bit snug, all but the Raptor require a touch of the throttle to start. I have been proactive on my Raptor and haven't let the valves get tight so I don't know how it would behave.

  5. #5
    Master Modder preddy08's Avatar
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    I've found that if they have already started tightning up then they will continue to do that untill you fix it internally.

    Running lean is a sure fire way to tighten'em up.
    Just a little 81hp trail bike.


  6. #6
    Modding the Motor Alkire193's Avatar
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    I see, I adjusted my valves last night but sure enough, it takes my bike a little throttle and TLC to start everytime.

    This would effect high RPM timing correct? Would it also cause a lean or rich condition?

  7. #7
    Modding the Motor CalledFollower's Avatar
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    Quote Originally Posted by preddy08 View Post
    I've found that if they have already started tightening up then they will continue to do that until you fix it internally.

    Running lean is a sure fire way to tighten 'em up.

    One thing I have seen that eats valves quick is poor air filter maintenance.

    I'm not sure what material the valves are made out of in the raptors, my guess would be that they are just a steel valve. With the steel valve, the material should be the same hardness clear through the valve. When they move, and you adjust, then everything is fine. Ti valves is where I've had my problems. Once they start to move adjusting clearances is just a band aid to postpone the required head work, normally new valves and cleaning up the seats.

  8. #8
    Modding the Motor Alkire193's Avatar
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    Just had my valves replaced with some nice Ferrera's. This is all good info. Im learning a lot. Keep it rolling if you have some input :)

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