top end swap?
Close
    
    
Results 1 to 5 of 5

Thread: top end swap?

  1. #1
    Member dutchbat's Avatar
    Join Date
    Dec 2012
    Location
    Holland
    Posts
    46

    top end swap?

    So, dudes,

    Me living in holland am not able to get the smallest amount of grunt out of my TW.. this said i have to confes that my TW only has 125cc. So i was wondering if it was possible to swap out my 125cc top end and put a 200cc top end in. I already was able to imagine i would have to change the piston arm out for a different one so that the piston would have a bigger stroke but besides that.. My idea's draw a blank..
    Is this idea possible? Has this been done already ( i could find any post on this on the old or new forum but you never know..)

    my idea was to buy something like this:
    1990 87 00 Yamaha TW200 TW 200 Trail Way Cylinder Jug with Piston | eBay

    would i have to bore anything out the bottom end?
    &
    would the 125cc "hat" fit on the 200 cc top end?

    any help would be amazing!
    thanks

  2. #2
    Super Moderator goldenhtr's Avatar
    Join Date
    Jul 2010
    Location
    Stanwood,Wa
    Posts
    1,880
    Might be some info for you here. I just did a search for --head swap

    https://tw200forum.com/forum/technica...s-similar.html

  3. #3
    Senior Member macbig2k1's Avatar
    Join Date
    Jul 2010
    Location
    Germany, Werdau
    Posts
    1,014
    A upgrade from 125 to up to 250 ccm (bore x stroke: 74 x 58,0 mm) is possible.

    No, you have to use a 200/225 head. The 125 valves are much too small.

    The needed parts:
    - 200/225/230 cylinder head
    - 200/225/230 cylinder
    - 200 crankshaft (55,7 mm stroke)
    or
    - 225/230 crankshaft (58,0 mm stroke)
    - piston, available from 67 to 74 mm


    If you have a DE01 with a 4 disk clutch, than you have to buy a new clutch pressure plate to convert the clutch to 5 disks.
    This is the absolute minimum.

    The 5 disk clutch works fine till 230 ccm (my engine, 22hp).
    For more ccm you have to use different clutch springs with some spacers to get a bit more pressure on the clutch disks.
    But it's better to install a new clutch boss and pressure plate to convert your "4 disk-4 spring" clutch to a "5 disk-5 spring" clutch.
    These parts are not expensive, you can get it for ~100-120 EUR.
    With a used (cheaper) clutch basket you can upgrade to a high performance "6 disk-5 spring" clutch (up to 44 Nm torque).

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Senior Member Mhurchu's Avatar
    Join Date
    Sep 2010
    Location
    Dublin, Ireland
    Posts
    112
    Look for an XT225 Serrow engine, all the parts are there but you may have to mill out the crank cases, hobble toghether a 125 / 225

  6. #5
    Member dutchbat's Avatar
    Join Date
    Dec 2012
    Location
    Holland
    Posts
    46
    ok thanks, one noob question tho..
    are all XT 225's "serrow" engines?and will the head of the XT also just sit on the bottom of te TW? because if so.. i think i'll have to make a rebuild and make a manual alongside of it to..
    thanks.

    [edit] just found the wiki page on the 225 thanks anyway's

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. bar swap
    By YTWTX in forum Performance and Customization
    Replies: 35
    Last Post: 10-15-2014, 12:49 PM
  2. Front end swap
    By wa_medic in forum Performance and Customization
    Replies: 3
    Last Post: 06-25-2013, 01:28 PM
  3. 06 fork swap to 98
    By titanium in forum Performance and Customization
    Replies: 3
    Last Post: 04-14-2012, 07:07 AM
  4. Color swap
    By srs713 in forum Performance and Customization
    Replies: 6
    Last Post: 08-15-2011, 10:57 AM
  5. Crankcase swap
    By Richb in forum Performance and Customization
    Replies: 3
    Last Post: 01-05-2011, 10:27 AM

Search tags for this page

can you put a 230 top end on a 125 bottom end

,
clutch kit
,
tw200topend
Click on a term to search for related topics.

Tags for this Thread