Intake valve not looking so good...
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Thread: Intake valve not looking so good...

  1. #1
    Senior Member reddave's Avatar
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    Intake valve not looking so good...

    So I decided I should check my valve clearance after about a year and I don't like what I saw. Exhaust valve...
    IMG_20190526_071056.jpg
    And here's the problem - Intake valve....
    IMG_20190526_071409.jpg

    The bike had a bad tick when I got it from my buddy who told me the valves needed adjusting. I adjusted them last June - but I didn't check for any damage. Bike has been running fine with minimal noise - bearing in mind these are noisy engines, of course. So what's your input? Catastrophe waiting to happen? Should I be researching part numbers and addressing this immediately? Honestly I shocked to see this...
    1987 Yamaha TW200

  2. #2
    Senior Member YamTW87's Avatar
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    I can't be of much help, but having metal bits flying around in the engine is never going to end up well.
    The two parts that seem to need replacement(6 and 8 from here) are pretty cheap, but I don't know how much time consuming it's to replace them.
    I wouldn't start the engine in this state again for sure and would replace the parts ASAP.
    2007 Suzuki V-Strom 650

  3. #3
    Senior Member RockyTFS's Avatar
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    Can't see a thing. There are metal bits in there? You will have to take the adjuster bolt all the way out to get a good look with some magnification at its tip and the valve tip. Then post those pics. In the meantime use a magnet to see if the metal bits I can't see are aluminum or steel.
    Last edited by RockyTFS; 05-26-2019 at 06:09 PM.
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

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  5. #4
    Senior Member YamTW87's Avatar
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    Quote Originally Posted by RockyTFS View Post
    Can't see a thing. There are metal bits in there? You will have to take the adjuster bolt all the way out to get a good look with some magnification at its tip and the valve tip. Then post those pics. In the meantime use a magnet to see if the metal bits I can't see are aluminum or steel.
    The valve stem at the 2nd pic is smashed/cracked.
    2007 Suzuki V-Strom 650

  6. #5
    Senior Member RockyTFS's Avatar
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    Quote Originally Posted by YamTW87 View Post
    The valve stem at the 2nd pic is smashed/cracked.
    Now I see it. Valve stem or retainer ring? A smashed retainer ring would be bad. Metal likely all through the top end.
    But if the ring is still holding the bits may still be in the valve box. If it did not hold the engine would swallow the valve in a millisecond.
    Last edited by RockyTFS; 05-26-2019 at 06:20 PM.
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  7. #6
    Senior Member reddave's Avatar
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    Thankfully, I did not notice any metal bits while I was in there. Just a busted up valve stem, as YamTW87 noted. Thing is it runs good and makes very little noise. Bike only has about 5K on it for being so old.
    1987 Yamaha TW200

  8. #7
    Senior Member YamTW87's Avatar
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    Quote Originally Posted by RockyTFS View Post
    Valve stem or retainer ring?
    Maybe both?
    2007 Suzuki V-Strom 650

  9. #8
    Senior Member reddave's Avatar
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    Sounds like I'm of commission until major repairs. (insert expletive) It's time for a beer...
    1987 Yamaha TW200

  10. #9
    Senior Member YamTW87's Avatar
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    Quote Originally Posted by reddave View Post
    Bike only has about 5K on it for being so old.
    Have you adjusted your valve clearance before,and if so, did you torqued the bolt correctly?
    Is your bike still covered by warranty?
    2007 Suzuki V-Strom 650

  11. #10
    Senior Member reddave's Avatar
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    Adjusted once last year, bought a torque wrench to do the job right. It's a 1987, so no warranty...
    1987 Yamaha TW200

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