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Thread: Feeler Gauge use for Valve Adjustment

  1. #1
    Junior Member D_SC's Avatar
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    Feeler Gauge use for Valve Adjustment

    I have noticed a relatively wide variance in feeler gauge drag depending on technique.
    With the blade perpendicular to the valve stem (parallel to the spring retainer) it drags .03mm less than a slightly skewed approach. This is nearly within the +/-.02mm spec but is still annoying to me. I am using a quality set of gauges and have tried another set with the same results. A 45 degree set would do well as mentioned in other threads, I misplaced mine. When the gauge is skewed the sharp edge of the screw can dig into the gauge, damaging it and giving a false feel.

    This was a BRAND NEW Bluepoint .279mm blade

    Feeler Gauge use for Valve Adjustment-feelsbad-jpg
    I was taught to run the gauge side to side rather than fore and aft.


    I am missing shims already.

  2. #2
    Senior Member Feeler Gauge use for Valve Adjustment
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    A good tip I got on feeler gauge use was to use a caliper to set it to the spec and get a feel for the appropriate amount of drag.

  3. #3
    Senior Member Feeler Gauge use for Valve Adjustment
    Feeler Gauge use for Valve Adjustment
    DirtFlier's Avatar
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    Using a micrometer set to the desired valve clearance is a more accurate tool to use because the contact points (called: spindle & anvil) more accurately approximate the valve tip & rocker arm adjuster screw. :-)
    Last edited by DirtFlier; 5th September 2019 at 17:39.

  4. #4
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    Feeler gauge drag feel is a learned skill that takes a technique and judgement.
    Go no go type feeler gauge are good way to try the next size up that will not fit.

    Video on light drag

    YouTube

    Feeler Gauge use for Valve Adjustment-9a106ce1-557c-4902-93cb-7206586bf0a0-jpg
    Last edited by showkey; 19th August 2019 at 05:51.

  5. #5
    Junior Member D_SC's Avatar
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    I'm known in four states for my feel.
    Feeler Gauge use for Valve Adjustment-img_5815-jpg

  6. #6
    Junior Member D_SC's Avatar
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    Quote Originally Posted by DirtFlier View Post
    They come in 0.15 mm and 0.20 mm which is exactly what the NC requires, plus they have a nice, serrated plastic handle so you'll be able to easily grip them with oily hands.
    My sources say the spec is .17mm IN .28mm EX for a 2012 nc700x

  7. #7
    Senior Member Feeler Gauge use for Valve Adjustment
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    Quote Originally Posted by D_SC View Post
    My sources say the spec is .17mm IN .28mm EX for a 2012 nc700x
    I don't have a service manual in front of me but I'm reasonably confident that they have a range of acceptable clearances.
    12 NC700X
    11 FE570
    11 FS570
    15 450/520XCF SM

  8. #8
    Senior Member Feeler Gauge use for Valve Adjustment dduelin's Avatar
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    I’m glad for the lessons my father taught me as a youth while I was holding a trouble light for him or running to get the tool he needed. The USAF trained him as an aircraft airframe and power plant mechanic. He was meticulous and gifted at improvising when a manual or procedure called a ‘special tool’. When he passed I brought his tools into my garage. For you younger guys, learn all you can while you can.

    To the topic, Dad taught me the slight drag of clearance. I’ve got straight gauges, bent tip gauges, and some straight ones bent to the particular need, just like the old guy’s garage in the movie Grand Torino. Now if I can just find them when I need them.
    Dave

    GL1800
    NC700XD




  9. #9
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    OP, I know what you mean about the amount of drag changing drastically with just slight changes in the feeler gauge positioning. It’s an irritant on the NCX, and a massive headache on my Honda pickup engine.

    Angled (or hand-bent) feeler gauges help, but they’re not a perfect solution nor even a high-reliability fix. They just help. For me, patience and careful technique have been the only ‘fix’ for this on either of my Hondas. I do NOT miss shims in any way, but other manufacturers make this a lot easier than Honda does.

  10. #10
    Junior Member D_SC's Avatar
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    What I've learned is to be triple sure that I'm getting a good read on the exhaust valves in particular. My method is to:
    loosen the adjuster screw until the feeler gauge can be easily inserted > adjust to spec > torque (feeler blade still in) > recheck the lash > remove feeler > insert feeler, check again

    All this doubly so without an ideal set of feeler gauges
    Feeler Gauge use for Valve Adjustment-c7d0c5f6-e7db-41c3-9d1c-726b79c785cc_1-76d37a72bdbfa148f69d447d288d9e8a-jpg
    motion pro might make a .007" and .011" like these

    sideline, bike has 25k miles interval for spark plugs is 32k whadda ya think
    Feeler Gauge use for Valve Adjustment-sp-jpg
    they are easy to get to...

    On a nicer note, this is a clean engine, barely a dusting of carbon under the valve cover!

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