Cornshield Engine Rebuild
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Thread: Cornshield Engine Rebuild

  1. #1
    Senior Member Cornelis's Avatar
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    Cool Cornshield Engine Rebuild

    I really don't want to do this right now, my bike was running SO well commuting with her daily all over the place without any problems at all

    Unfortunately she was just burning too much oil for me to continue riding so I took off the engine today and I want to open it tomorrow.

    As you can see I have the full range of special tools for the job . . . .

    New 70 mm oversize piston and rings to be installed, I don't need to split the gearbox because it is still in a good condition

    I will post the photo's of the inside of the engine tomorrow



    Last edited by Cornelis; 10-30-2017 at 12:43 PM.
    admiral, littletommy, Fred and 9 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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  2. #2
    Super Moderator Purple's Avatar
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    The one in the middle seems about right ....
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
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  3. #3
    Senior Member Elvesus's Avatar
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    Good luck Cornelis!
    littletommy, Cornelis, Ken and 1 others like this.
    John in Nanaimo

    2013 TW200 - with Shinko 241 front tire, Rox 2" anti-vibe risers, Polisport Touquet handguards, homemade wind deflector, Manracks utility rack

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  5. #4
    Senior Member admiral's Avatar
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    For some reason, I'm drawn to your toolset. Too bad you have to use it. I hope the operation is successful Dr. Cornelis.

    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
    Senior Member Fred's Avatar
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    Title had me worried you had suffered a disaster. Nice you are just hammering out some timely maintenance before something serious happened. Now might be a good time to get sealed bearings for the swing arm to avoid any assembly difficulties. Otherwise it can be a challenge getting all the factory bushing seals and swing arm aligned with the frame holes while inserting the pivot bolt.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  7. #6
    Senior Member Cornelis's Avatar
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    Thank you for your encouraging words everyone and I want to let you all know that at least I'm not left by myself but I have a biker friend who offered to help me with the rebuild.

    His name is Gavin and this guy has a double garage with 9 bikes with 6 up and running and 3 in various stages of rebuilding, he's a real biker to the bone.

    Whenever he's got some spare time he is working and tuning one of his bikes



    His latest project is the rebuilding of a Kawasaki ZX11 Turbo



    Last edited by Cornelis; 10-30-2017 at 02:17 PM.
    admiral, littletommy, Fred and 7 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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  8. #7
    Senior Member scotti158's Avatar
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    A wide selection of "UAT"s.... Universal Adjusting Tools.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  9. #8
    Ken
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    Senior Member Ken's Avatar
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    How many miles did you have on it before the rebuild? What oil and weight did you usually use? Are you going to put a bigger cam and valves while you have it apart? Good luck with your rebuild.

  10. #9
    Super Moderator Purple's Avatar
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    Quote Originally Posted by Fred View Post
    Now might be a good time to get sealed bearings for the swing arm to avoid any assembly difficulties. Otherwise it can be a challenge getting all the factory bushing seals and swing arm aligned with the frame holes while inserting the pivot bolt.
    What you need to do, is to anchor one side of the rear frame to a fixed point, and attach the other end to the back end of the ZX11 — then, while the Kwack pulls the two bits apart, you need to get under there with the relevant parts of the swinging arm assembled, (with said lump hammer in hand), while a third person bounces up and down on the seat

    With a bit of practice (and a significant amount of tire smoke), eventually the clutch on the Kwack will give up the ghost - and at exactly that moment, (if you’ve timed it right), that last smack of the hammer will seal the deal

    Your friend may go through a few bikes trying this method — but hey — that’s what are friends for ……
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  11. #10
    Senior Member phelonius's Avatar
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    The tool in the middle is for adjusting Harley valves and ignition timing.
    Phelonius

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