Cylinder Base Leaking - Tips and Tricks?
Close
    
    
Page 1 of 3 123 LastLast
Results 1 to 10 of 21
Like Tree24Likes

Thread: Cylinder Base Leaking - Tips and Tricks?

  1. #1
    Junior Member Brealytren's Avatar
    Join Date
    Mar 2019
    Location
    Coon Valley, WI
    Posts
    1

    Red face Cylinder Base Leaking - Tips and Tricks?

    Hello All,

    I'm new to the world of TW200's...but not to restoring bikes in general. The story? My son in law dropped off his TW200 at my home with the hope that I'd change out the leaking cylinder base gasket. A quick bit of research shows this is a common problem which can only be cured long-term with updated OEM gaskets. My questions to the group are:

    1 Does anyone have a full list of the Yamaha gasket and seal part numbers needed to pull the head and cylinder?
    2. Is there a tutorial available on the job? I'm most in need of torque specs and cam timing info.
    3 Finally, are there any tips to be shared on how to the job right....the first time.

    Thanks in advance from Wisconsin
    buellzebub likes this.

  2. #2
    Senior Member Darth's Avatar
    Join Date
    Nov 2013
    Location
    Timbercreek Canyon, Texas
    Posts
    1,601
    Go to Partzilla.com and search OEM parts for your year model. Good OE schematics.
    That is a good place to order from, usually MUCH better than a dealer.
    'Zilla's OE parts are discounted but they have a high threshold for free ship.

    Same deal at Rocky Mountain ATV and others.

    Might be a good time to clean up the carb jets & settings, as well. They all come lean.
    Lots of info on here.

    PS - Check out the "SimilarThreads" listings at the bottom of this thread.
    buellzebub and Donzo like this.
    “It’s more fun to ride a slow bike fast, than a fast bike slow”.

    "The less horsepower a motorcycle has, the more it can teach you.” - Ben Bostrom

    And though a mountain may rise up and smack the livin' shit outta me,
    and wad up my bike somethin' awful...
    Still, I rise!
    (With apologies to Maya Angelou)

    Humans: simultaneously capable of such genius and such douchebaggery!

    "Give a Damn"
    - C. M. Howe, Jr.

    Hidden Content

  3. #3
    Super Moderator Purple's Avatar
    Join Date
    Mar 2015
    Location
    Ynys Môn
    Posts
    4,472
    Loosen it off - pat it on the head and call it George - then re-tighten to spec ......
    elime, Darth, PlacerLode and 3 others like this.
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
    - Hidden Content

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Senior Member elime's Avatar
    Join Date
    Jul 2010
    Location
    San Jose, CA
    Posts
    6,932
    I agree with Purple. First try re-torquing the head bolts using something like Hornady's Case Lube as a lubricant. Re-torquing works about half the time and is a lot less work. Well worth the gamble.
    Long live the internal combustion engine!

  6. #5
    Senior Member PlacerLode's Avatar
    Join Date
    Apr 2012
    Location
    Out West
    Posts
    2,998
    yup the clean, lube threads with One-Shot (ammo reloading spary chemical) re torque was a great discovery has worked every time for me

    it was 2010 when they updated the base gasket but I believe thats the only one they sell now
    elime likes this.
    "It's Like Warm Apple Pie"

    Hidden Content

  7. #6
    Senior Member admiral's Avatar
    Join Date
    Jul 2010
    Location
    Frosty Hollow
    Posts
    12,904
    Quote Originally Posted by Brealytren View Post
    Hello All,

    I'm new to the world of TW200's...but not to restoring bikes in general. The story? My son in law dropped off his TW200 at my home with the hope that I'd change out the leaking cylinder base gasket. A quick bit of research shows this is a common problem which can only be cured long-term with updated OEM gaskets. My questions to the group are:

    1 Does anyone have a full list of the Yamaha gasket and seal part numbers needed to pull the head and cylinder?
    2. Is there a tutorial available on the job? I'm most in need of torque specs and cam timing info.
    3 Finally, are there any tips to be shared on how to the job right....the first time.

    Thanks in advance from Wisconsin
    BEGINNERS GUIDE TO BASE GASKET REPLACEMENT
    https://www.tw200forum.com/forum/tec...placement.html
    Fred likes this.
    Hidden Content A ride in the woods helps me relax and release tension. The fact I'm dragging a body should be entirely irrelevant?

  8. #7
    Senior Member Miaugi's Avatar
    Join Date
    Oct 2017
    Location
    Alfred, On
    Posts
    463
    Welcome to the forum! Beware....after you test ride your son-in-laws T-Dub you may have an overwhelming urge to buy one yourself.....do not attempt to fight it as it will consume you.
    zippythezip and Donzo like this.
    Hidden Content Sold...Oct 2018......'01 F650GS

  9. #8
    Senior Member RaZed1's Avatar
    Join Date
    Oct 2015
    Posts
    249
    As said often a simple re-torque on the head bolts is enough to stave the problem off. The gasket part # did change, but the root cause of the problem was uneven machining between the two case halves. Where they meet there is often a noticeable "ridge", with one side being maybe 10-20 thou higher than the other, over time tends to start to leak a little oil.

    The "fix" is to just sand it smooth and eliminate the problem. It took maybe 20 seconds with a dremel while I had the jug off anyway.
    elime and Miaugi like this.

  10. #9
    Junior Member BrotherJim's Avatar
    Join Date
    Jan 2019
    Location
    East Central Indiana
    Posts
    12
    I had an oil-leak issue that I thought was the base gasket on my '89 TW, but it turned out to be the right side crankcase cover near the base gasket. The issue and fix was just like RaZed1 said. YMMV. Welcome and good luck!

  11. #10
    Senior Member rurlndum's Avatar
    Join Date
    Jun 2013
    Posts
    462
    I have found that not having synthetic engine oil in the crankcase also helps.


Page 1 of 3 123 LastLast

Sponosred Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. Cylinder head and cylinder assembly problem
    By jgaff in forum Technical Help
    Replies: 6
    Last Post: 07-05-2017, 10:23 AM
  2. Leaking Base Gasket OR Leaking Starter o-ring!
    By JS5owner in forum Technical Help
    Replies: 1
    Last Post: 11-08-2016, 08:37 AM
  3. Replies: 10
    Last Post: 05-15-2016, 06:10 PM
  4. odd rattling sound now oil leaking from cylinder head?
    By Braden in forum Technical Help
    Replies: 20
    Last Post: 10-05-2013, 04:28 PM
  5. Kolpin gas can L-Bracket to Cyclerack mounting tips/tricks?
    By n8bone in forum Performance and Customization
    Replies: 7
    Last Post: 08-12-2012, 09:27 AM