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Tu250 bigboy

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  • Tu250 bigboy

    THE GRASS TRACKER, thats what it is called. before my dream starts spreadin its wings,
    i would like to have the opinion of the knwoledgeable riders, here at xbhp, on this topic:
    would it be possible to contruct/modify a motorbike to make it look like the bigboy grasstracker if we want to build it around the frame and engine derived from some 150-180cc bike commonly sold in india?
    keeping in mind that the bike needs to be a feasible ride in and around a city.

    "Only a biker knows why a dog sticks his head out of a car window"

  • #2
    Help Topic Approved
    The Wheel was a great invention; Two Wheels with a Motor in between was even better!


    BMW Motorrad Days 2011

    Xbhp's Indo-French Kashmir-Ladakh Tour

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    • #3
      Old CBZ frame would be a good choice or maybe YBX Both are single cradle with engine the stressed member similar to the pic. But ll be difficult and wont be practical for regular use...

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      • #4
        i dint like the part "wont be good for practical use" [is it coz of the ergonomics? change in stance]..
        all i want is the way the front fork,handle and headlight is setup along with the single speedo
        and
        the flat contour beyond the tank region... would these be very tough to replicate if i use, suppose a p150 double cradle frame..?

        i just want to carry forward the basic theme of the grasstracker..
        "Only a biker knows why a dog sticks his head out of a car window"

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        • #5
          p.s.

          thanx ken sir for aproving query.
          "Only a biker knows why a dog sticks his head out of a car window"

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          • #6
            How about this setup:
            1. RD-350 (for the 2-stroke torque)
            2. FZ 16 forks and disc brake up front, FZ swing arm modified for the rear with the monoshock
            3. A mid-range chamber to suit mud-moving and city streets(2 to 1 or otherwise)
            4. Wheels as per your choice, preferably on FZ sized rims
            5. Custom handlebar as per the look and feel you need

            The benefit would be a 2-stroker that can rip through the hills, and get you to work too. The cost may not be very justifiable though.

            Cheers,
            Last edited by shrek; 09-23-2009, 03:17 PM. Reason: missed the 250 cc heading.
            Four strokes move my body, two strokes move my soul.
            1988 RE Std 350 (Bull)
            1998 RX 135 4-speed (Stella)
            2012 KTM Duke 200
            2012 Ninja 650

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            • #7
              ^ thts gonna be one helluva machine , but sadly im not considerin a 2stroke engine primarily for the same reason as you stated.

              the front shocks as per the look goes[grasstracker] have to be longer than stock suspensions on indian bikes i feel, but if we fit longer forks into a frame of supoose a unicron or a pulsar etc, the main frame would tilt backwards puttin more stress on the rear swing arm and suspension... isnt it?
              any solution for that? apart from, raising the hieght from the back suspension too.


              i mention a pulsar or uni,coz i want to use engines that will be considerably trouble free and i want to use the frame that comes with the engine coz then i wouldnt have to worry about engine mounting, as tht would be stock setting.
              coz i knw some people with customade bikes with custom frames who suffer from tremendous vibes and engine mounting problems.

              another thing im worried about is--
              how is the shape of the frame for these stock bikes, beyond the tank, coz most of the bikes have a pillion n tail section that projects away from the ground unlike the flat seat as in the grasstracker or the yammy 2strokers..
              here im attaching a picture of a yammy360 frame, would be delgihted if anyone can post pictures of a standard 150 cc frame..
              "Only a biker knows why a dog sticks his head out of a car window"

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              • #8
                Imo, the karizma engine and frame would be worth a thought. Considering it is a detuned version of the crf that somewhat matches your needs, I think it may be possible to use it. And the zma engine is so reliable it puts others to shame.

                About the stress on the rear suspension when the forks are longer, I think you have a solid risk there. Perhaps lengthening the bike with adjustments to the rake angle may bring the weight distribution more towards the front and center, rather than the rear. I'm least qualified, but inside my head, this seems to be right.
                Last edited by shrek; 09-23-2009, 09:39 PM.
                Four strokes move my body, two strokes move my soul.
                1988 RE Std 350 (Bull)
                1998 RX 135 4-speed (Stella)
                2012 KTM Duke 200
                2012 Ninja 650

                Comment


                • #9
                  yes, even i had thought about the rake angle, but hv no clue how that can be open to adjustment.. comin to the part of the frame towards the tail, could u share any picture you might have, of zma or any other desi 4stroker.. coz as i hv mentioned earlier i dnt remembr if its just the seat and side panels that are inclined or is the frame also inclined away from the ground[unlike the frame pic i hv posted]?
                  Last edited by gotlo; 09-23-2009, 10:38 PM.
                  "Only a biker knows why a dog sticks his head out of a car window"

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                  • #10
                    Ooh, just realised that the rake adjustments would require a modification to the frame, and I think once the frame is cut and welded back, the entire structural strength and integrity are lost. I'll give it some more thought, may have to look at grabbing a frame off longer bikes like the RE's and the eliminators, but that will negatively impact the ground clearance. I'll break my head for a day or two and get back. I still think the Zma frame will be better than most, but let's think it through.

                    Cheers,
                    Four strokes move my body, two strokes move my soul.
                    1988 RE Std 350 (Bull)
                    1998 RX 135 4-speed (Stella)
                    2012 KTM Duke 200
                    2012 Ninja 650

                    Comment


                    • #11
                      thx bro, its gr8 tht sm1 is makin so mch of an effort into smthn tht might not even see the light of the day, but even if tht day comes, i wnt to be sure tht im doin [or not doing] the thing after having done solid background research.
                      tk ur time. im in no hurry
                      good things come to those who wait
                      thx again.
                      "Only a biker knows why a dog sticks his head out of a car window"

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