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valve help

Discussion in 'XJ Technical Chat' started by rotax74, Apr 1, 2009.

  1. rotax74

    rotax74 Member

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    ok so i know that i am runnig rich on 3 out of 4 cylinders and i just read a post from chacal who says it is good to start with the valves. ok im going to check the valves for the first time in probably a very long time. what tools am i going to need when i get the head off. what parts am i going to need to change when i get in therer and how easy/hard is it? any help with this situation would be greatly appriciated.
     
    rotax74, Apr 1, 2009
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  2. jdrockin

    jdrockin Member

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    Grab a metric feeler gauge to check the clearances and make sure that it can gap small enough. from as little as .03mm or so. Valve shim tool from chacal, and a copy of Airhead Guide to Valve Adjusment Sticky post from the forums :) Make sure to read through the guide a couople of times before you start to make sure you have all the right tools and information. Not NEARLY as hard as many people(including myself) ever thought. Did I mention make sure to have the correct tools? Good Luck!!!
     
    jdrockin, Apr 1, 2009
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  3. Don_A

    Don_A Member

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    +1 on the valve adjustment guide. You can find it HERE

    Read it, know it, love it. It not that hard.
     
    Don_A, Apr 2, 2009
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  4. RickCoMatic

    RickCoMatic Well-Known Member

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    Before you do Valve Clearances ... you run a quick Compression Test.

    You always do the Compression Test BEFORE doing the valve clearances.
    You might find an Issue more important to deal with than a tight or loose valve.

    Compression Readings are the most important Specs you need to know.
     
    RickCoMatic, Apr 2, 2009
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  5. rotax74

    rotax74 Member

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    would anyone know the specs for 1983 yamaha maxim 750 with yics engine for the compression test. or what ball park each cyclinder should be in?
     
    rotax74, Apr 2, 2009
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  6. DaveXJ

    DaveXJ Member

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    All cylinders should be within 10% of each other with no more than 14 psi between any two cylinders. The specs in the Haynes show max. 171 psi and 128 psi as min. with 156 psi being standard pressure.
    Hope that helps and don't forget to ground the spark plugs or disconnect the TCI, you dont want to burn out the TCI!
     
    DaveXJ, Apr 2, 2009
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