Montesa 4rt S3 300cc Big Bore Kit

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.

Engineering and production 100% made by S3. Heavy duty casting, with more water capacity and more water circulation, flux spiral. The kits are delivered ready to fit on the engine, with cylinder and piston already assembled, and gaskets sets. Cylinder with NI-CA-SIL S3CYL®.

More power, more dreams. For a perfect output is good to use the S3 titanium exhaust pipe ( ref:EX-MON) and make injection settings.

Big bore kit for the Montesa trials motorcycle 2016 and older. This kit increases the diameter of the piston by 2 mm which will help the engine generate more power.