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Running issues causing slowness?

Discussion in 'Yamaha 250cc In-Line 4's' started by robbo1, Apr 9, 2008.

  1. robbo1

    robbo1 New Member

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    Hey guys i was just wondering if i could get some idea of how well FZR's are speed wise against CBR's and ZXR's because i've been getting thrashed off the line and at high speed. do i have running problems or is it just that they are quicker bikes?
     
  2. drewzor

    drewzor New Member

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    If they are all 250's and your all the same weight then probably something wrong.

    FZR's 29kw @ 14000rpm
    ZXR's 32kw @ 15000rpm
    CBR (94-96) 34Kw @15000rpm.

    Try to improve air delivery, lose 5kg and think about changing sprockets to get a torque ier gear ratio. who needs to do 170kph right?
     
  3. larrywasanicekid

    larrywasanicekid New Member

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    Im lucky enough to have a friend with a good condition zxr, and a friend with a mint cbr... and me with my pretty good fzr.

    Depends on riders launch skill of course, but:

    0-40k's- FZR wins cos of our little friend exup! (and a slipping clutch at 10000rpm <!-- s:roll: --><img src="{SMILIES_PATH}/icon_roll.gif" alt=":roll:" title="Rolling LoL" /><!-- s:roll: -->)

    0-100kmh- FZR and CBR are EXACTLY... well so very very close, you'd wonder where the extra $2000 went. <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->

    100+k's the ZXR whoops us all... But i think this is because of my friend has a big back sprocket. He can do 203! i top out at 185 or so.
     
  4. robbo1

    robbo1 New Member

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    year coz i get hammered off the line. do you rekon that i could have a fuel flow problem coz it chokes really bad when the revs get up to about 8-10000 rpm and i loose heaps of power
     
  5. drewzor

    drewzor New Member

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    My FZR runs a 17T front sprocket and rear 57T sprocket. Assuming this is stock and what you guys are using you could improve delivery of speed by dropping the size of the front sprocket by 2 teeth and increase the rear by 1 tooth you will get 15% faster in each gear but lose some top speed. for example if your top was 140kph with this gearing you will lose 21k's and have a 119kph top speed.

    Edit;
    Based on if zxr was the same weight, using its gear ratio it seems
    that the zxr is 21% more power at the wheel then the fzr.
     
  6. robbo1

    robbo1 New Member

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    Oh year ill look at that then cheers
     

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