Hmmm, you ask for more units than those available, we give you what we have.
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KIT CYLINDER-PISTON BIG-BORE FOR MONTESA-HRC 300cc 4RT.
High quality product. More capacity gives the engine more torque on bottom and more power on revs. The engine is very smooth on low RPM, and very powerful on high RPM.
To be able to Mount the cylinder of 300cc it will be necessary to touch up the opening of crankcase with diameter of 89mm, in order to leave the passage for the skirt of the cylinder.
You can do it in dremel or on a machine type: milling machine.