tw125 replacing valve stem oil seals... questions
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Thread: tw125 replacing valve stem oil seals... questions

  1. #1
    Member lyncho1983's Avatar
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    tw125 replacing valve stem oil seals... questions

    Hi all,

    So it looks as though I need to replace the valve stem oil seals on my bike, its burning oil on start up, ive not done a job like this before on a bike so ive been reading up on it and have some questions.

    1. order in which I do things and if theres anything I am missing?

    -remove anything attached to the head like exhaust, carb etc...
    -remove cam chain cover
    -remove cam chain tensioner
    -remove cam chain sprocket.
    -remove head
    -remove valves, replace seals and build back up.

    2. can the head be removed whilst the engine is still in the bike?

    there is probably lots I have missed so any info/help would be much appreciated.

    thanks in advance
    darren
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  2. #2
    Senior Member TW-Brian's Avatar
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    1. order in which I do things and if theres anything I am missing?

    -remove seat
    -remove tank
    -remove top engine mount

    2. can the head be removed whilst the engine is still in the bike?

    Yes

  3. #3
    Member lyncho1983's Avatar
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    thanks brian, that's great

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  5. #4
    Senior Member admiral's Avatar
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    Quote Originally Posted by lyncho1983 View Post
    Hi all,

    So it looks as though I need to replace the valve stem oil seals on my bike, its burning oil on start up, ive not done a job like this before on a bike so ive been reading up on it and have some questions.

    1. order in which I do things and if theres anything I am missing?

    -remove anything attached to the head like exhaust, carb etc...
    -remove cam chain cover
    -remove cam chain tensioner
    -remove cam chain sprocket.
    -remove head
    -remove valves, replace seals and build back up.

    2. can the head be removed whilst the engine is still in the bike?

    there is probably lots I have missed so any info/help would be much appreciated.

    thanks in advance
    darren

    I don't know if you can view my picture link but we'll give it a shot. https://photos.google.com/album/AF1Q...xf_611txEv60-n

    Yep, you can pull to head off without removing the entire engine out of the frame as TW-Brian mentions. Good luck in your repair.
    Hidden Content A ride in the woods helps me relax and release tension. The fact I'm dragging a body should be entirely irrelevant?

  6. #5
    Member lyncho1983's Avatar
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    yep, I can see your picture. that's great buddy. thanks.

  7. #6
    Member lyncho1983's Avatar
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    just out of interest guys, parts wise will it just be the valve stem oil seals and a new head gasket that il need?

  8. #7
    Senior Member admiral's Avatar
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    I also bought the valve stem seat's as they didn't cost that much more.


    Also, consider lapping your valves since you have it opened up. May not be necessary but it's pretty easy. I think forum member elime has a thread or pictures on here somewhere. Lots of info on the www as well.
    Hidden Content A ride in the woods helps me relax and release tension. The fact I'm dragging a body should be entirely irrelevant?

  9. #8
    Senior Member Cornelis's Avatar
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    Here is the original post by elime on the 29th of April 2013 -

    Quote Originally Posted by elime View Post
    I was replacing the base gasket on my parts bike and figured as long as the head was off to lap the valves. For those that don't know what valve lapping is it is sticking a small rubber suction cup on the valve, putting some valve lapping compound between the valve and valve seat and spinning it back and forth. What this does is grinds the surface of the valve and valve seat so they have the same shape and makes for a good seal -- hopefully



    .



    This is my starting picture. The valves have already been removed, lots of carbon, and it looks like the valve stem oil seals weren't doing their job either. Arrows point to the valve seat.







    A little later in the process. Most of the carbon in the combustion chamber is gone and the seats look a lot better.







    A close up of the valve seats.







    Before and after of the valves:



















    The bike ran well but felt down in power. Along with the valve lapping I also installed new rings and valve stem oil seals. Reports to follow as to the results.

    I forgot to include the really exciting picture of the head with the valves installed! Also I have discovered a "parts bike" is a bike you buy parts for. I used to think it was a bike one cannibalized then sold the remains to help offset the cost, but I was wrong.

    maddawgj, elime, Purple and 3 others like this.
    1990 Yamaha TW200Hidden Content _____________ Come to Me, all you who are weary and burdened, and I will give you rest. - Matthew 11:28
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  10. #9
    Member lyncho1983's Avatar
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    well I tackled this job yesterday.

    Had a bit of a nightmare as I couldn't figure out how to remove the tappets(not sure if that's what they are called), because I couldn't remove these I couldn't get the springs out so I had to replace the valve seals with the springs in place which was a right pain!!

  11. #10
    Senior Member Badgerflorida's Avatar
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    Great photos. Photobucket be damned. Thanks for this. Cheers
    littletommy and maddawgj like this.
    01 SOLD
    96 SOLD
    89 restored SOLD
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    05 (restoration in process)
    03 SOLD
    04 in great condition

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