S3 - Big Bore Kit - 300cc - Montesa 4RT
Diameter: 81.50⌀
High quality kit allowing the Montesa 4RT to have a 300cc displacement. 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.
Kit Includes:
• Cylinder
• Piston, Rings, Wrist Pin
• Gasket Set
NOTE: Use of the 300cc kit requires opening the crankcase diameter to 89mm, allowing clearance for the cylinder skirt. This can be done with a Dremel tool or milling machine.
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