Why are there no big bore kits for the TW?
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  1. #1
    Senior Member PalmStateCrawler's Avatar
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    I have been thinking about this for months now. There are kits for the blaster 200 but no mention of a TW kit. Is it possible that the blaster kit may work for our bikes? This may be a dumb question but it is one I feel the need to ask.
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

  2. #2
    Senior Member lizrdbrth's Avatar
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    The Blaster is a 2-stroke. Different critter altogether..



    Kits for the TW probably wouldn't sell very well because the case mouths won't accept much of an overbore. Oversized pistons exist and any reputable shop can bore your cylinder, it just won't yield much bang for the buck. Standard bore is only 67mm yielding 196cc. A 1mm overbore only yields 202cc and a 2mm overbore is 208. Lots of munny and effort for a 10% gain.



    Opening the case mouths takes things out of the realm of the simple "bolt-on" big bore as it requires splitting and machining cases, but it allows you to move up to the 225 cylinders which have a 70mm standard bore.



    A 70mm bore with the TW's 55.7mm stroke yields 214cc. 227cc if the 225 cylinder is overbored to 72mm.



    Add the 225's longer stroke 58mm crank and you get 223cc with the 70mm bore and 236cc with a 72mm overbore.



    Those are about the max displacements using pistons which are readily available.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  3. #3
    Senior Member PalmStateCrawler's Avatar
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    Hmmm... sounds like I need to make nice with someone that owns a machine shop.
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

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  5. #4
    Senior Member macbig2k1's Avatar
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    There is also a 73mm (233,1ccm with 55,7mm stroke/242,8ccm with 58mm stroke) piston from Wössner available



    It's also possible to upgrade to 250ccm -> 74mm piston (is a std. piston, available from Yamaha, Wiseco and JE Piston).

    But you will need for this a 225 crankshaft, a new con rod and a special new big pin bearing.



    Yery important:

    You have to upgrade your clutch, if you're going over 225ccm.

    I have 229,6ccm and the Dyno result is 22hp (Akrapovic Racing exhaust and Webcam stage 3 camshaft).

    I am using friction plates from EBC and the stiffer springs from EBC (CSK052), but this isn't enough. The clutch is slipping in higher RPM.

    So, I recommend friction plates from Barnett and some other stiffer springs from EBC (CSK002). This should handle the power.





    Sebastian

    TW-Parts.com

  6. #5
    Senior Member PalmStateCrawler's Avatar
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    If i'm not mistaken, while looking at tw-parts.com it states that you can use a 69-73mm piston with the oem head, different liner and modify the airbox to reach higher cc's?



    Would there be any noticeable difference from the oem piston to a same size high compression piston?
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

  7. #6
    Senior Member lizrdbrth's Avatar
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    Check with Sebastian. I believe the bigger liner still requires opening up the case mouth.



    The 73mm piston is low compression. I'm not sure how performance will stack up against the smaller bore and higher compression offerings.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  8. #7
    Senior Member PalmStateCrawler's Avatar
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    Has anyone installed a high compression piston that can attest to the difference between the stock piston?
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

  9. #8
    Senior Member lizrdbrth's Avatar
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    While you're waiting for a response, here are the Wiseco listings for the standard overbores of the TW sleeve:



    http://www.wiseco.com/ProductSearch.aspx



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  10. #9
    Senior Member pgilles's Avatar
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    Sold bike.



    Youtube vids of old TW's acceleration:

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  11. #10
    Senior Member PalmStateCrawler's Avatar
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    I have considered an engine swap but mine still has over 3 years left on the warranty. Just looking for a little more bottom end grunt for riding trails. If I need more speed I will get a different bike. The TWs top speed keeps me out of trouble and off the highway.
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

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