Cr144 05

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Apr 7, 2003
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#1
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
 

steve125

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Oct 19, 2000
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#2
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
Thanks, that would explain why all i see are 139s. The site didn't offer a lot of info model by model.
 
- a d v e r t i s e m e n t -

Eric Gorr

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#4
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.