I have a EC125 Racing modified toa 144cc.
The modifications are much more than only another piston and bigger cylinder.
One dealer here in Germany is doing this and it cost on total 1000,- euro
yamaha piston
bigger machined cylinder
special CDI
VHM head
modified crank shaft
etc
etc
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4 strokes are only good for power generators 
Last edited by Elvis74; 01-20-2012 at 10:57 AM.
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