Cr144 05

Discussion in 'Eric Gorr's Moto Tech Articles' started by krosser, Jul 2, 2005.

  1. krosser

    krosser Member
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    Been on to Eric Gorrs site which says about 144cc kits which it seems more than a few are running. I had one circa late 90s but most only offer 139cc for newer models. Is the 144cc kit avail for a CRI25 05 as well as older models. The list is not very specific.

    Thanks
     

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  2. steve125

    steve125 Lifetime Sponsor

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    Since the PV change that started in 2000, to get to a 144 the bore is enlarged 2mm and the crank stroked 1mm. It can't be done by bore alone.

    The YZ/RM/KX can be made 144 with just the over bore.
     
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  3. krosser

    krosser Member
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    Thanks, that would explain why all i see are 139s. The site didn't offer a lot of info model by model.
     
  4. Eric Gorr

    Eric Gorr Engine Builder

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    Just switching to a RM125 piston and modifying the head will give much better low end on your bike. The timing height is 1.25mm higher.
     

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