Valves - tight or loose?
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  1. #1
    Member jimgoose's Avatar
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    Hi -



    I saw this answered on the old forums but they don't seem to be searchable.



    Is it better to set the valves to the tighter end of the spec or the looser? I think I remember reading that the tighter end is better as the valve and seat wear will cause the adjustment to loosen up. The valve/seat wear basically shortens the valve which cause the clearance to increase, yes?



    Or am I completely back-asswards?



    Goose
    Hold back the edges of your gowns, Ladies, we are going through hell.

  2. #2
    Senior Member srs713's Avatar
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    I have no idea on the valves, But the deal with the old forums is you can search it with Google.



    You can use "site:https://tw200forum.com/forums" to limit the search to the old archives.

    Search uses boolean logic... + in front means word must be in result, while - in front of word means do not include results with that word.



    Or just use the advanced search page.

    Stephen S.

    '07 TW200:

    15/50 sprockets, O-ring chain, D2Moto foot pegs

    tweaked carb (127.5 jet, 0.019 needle shim, idle screw @2.25),

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  3. #3
    Member Black Hawk's Avatar
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    As the valve seats and valves wear the valve gap gets tighter

    so set them to the loose side.
    Summer in the Black Hills of SD

    Winter in the desert around Yuma AZ

    2004 TW

    2003 KLR650

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  5. #4
    Member jimgoose's Avatar
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    Quote Originally Posted by srs713 View Post
    You can use "site:https://tw200forum.com/forums" to limit the search to the old archives.



    Tried that first. Couldn't find the thread or close to what I remembered it being.



    It does seem that I am backwards on this one. The more I thought through it, the more it seemed wrong.
    Hold back the edges of your gowns, Ladies, we are going through hell.

  6. #5
    Junior Member ReddingRdr's Avatar
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    Quote Originally Posted by jimgoose View Post
    Hi -



    I saw this answered on the old forums but they don't seem to be searchable.



    Is it better to set the valves to the tighter end of the spec or the looser? I think I remember reading that the tighter end is better as the valve and seat wear will cause the adjustment to loosen up. The valve/seat wear basically shortens the valve which cause the clearance to increase, yes?



    Or am I completely back-asswards?



    Goose


    I haven't heard of anyone having problems runng the valves at spec. Generally I don't like to runs valves tight. A tight valve can allow the valve head to sit lightly in the seat. This leads to over heating of the valve and possibly the burning there of. Loose valves may idle a bit smoother, but are usually are louder and cause increased wear, and again I haven't heard of any advantages.

    A few years back I bought a used '04 that I maintained the valves at stock clearance. Then in '07 I bought my wife a new TW. At about 50 miles I did an oil change and ran the valves. I found that the set up tech had set both the intake and exhaust valves a couple thousands loose. Okay, maybe he knew something I didn't. I didn't reset them, but chose to see how the lash worked. As things work out I ended riding both bikes ( should have known ). For the first few thousand miles I more than regularly checked to see if the settings were changing. They weren't. I never really noticed any differance in the two engines. Now w/ about 5000 miles on both bikes I lash them within spec. I don't really think that a thou or two loose would matter much. So if you would feel better going a little loose I don't see any harm in doing so. But, I wouldn't go overboard in this department becaused increased wear is sure to occur, especialy w/ higher RPM operation. Ron

  7. #6
    Junior Member ReddingRdr's Avatar
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    Quote Originally Posted by jimgoose View Post
    Hi -



    I saw this answered on the old forums but they don't seem to be searchable.



    Is it better to set the valves to the tighter end of the spec or the looser? I think I remember reading that the tighter end is better as the valve and seat wear will cause the adjustment to loosen up. The valve/seat wear basically shortens the valve which cause the clearance to increase, yes?



    Or am I completely back-asswards?



    Goose


    I see in another thread a picture of a chipped adjuster and a mashed valve tip. It would be a good bet that the setting was loose at one time or another. Ron

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