Description
Polini EVOLUTION P.R.E. 4 – Racing Technology for Maximum Performance
With the new EVOLUTION P.R.E. 4 product line, Polini once again sets standards in scooter racing. Available in 70cc and 100cc, developed for scooters with Piaggio or Minarelli engines with flange-mount crankcases.
Polini PRE 4 Cylinder
The Polini Evolution P.R.E. 4 cylinder is the heart of the P.R.E. 4 engine, an extremely powerful cylinder for those who want to be at the front of the pack on the race track.
The sophisticated 5-transfer port layout with a bridged exhaust port ensures optimal gas flow and peak performance. The internal geometry, as well as the combustion chamber and squish gap, are precisely calculated for each displacement version to get the absolute maximum out of your engine. A real highlight is the completely redesigned, two-piece cylinder head in Polini blue. Thanks to the lateral water connection, it can be mounted quickly and easily on almost any scooter.
The 100cc racing cylinder should be used in combination with the precisely matched P.R.E. 4 exhaust and P.R.E. 4 crankshaft and is intended for use with a high-end tuning crankcase (Malossi C-One, Polini P.R.E., 2Fast Passion, 8.1 Fireblade).
Polini Racing Engine - Perfectly Matched Racing Kit
The new PRE 4 set consists of a cylinder, crankshaft, and exhaust, which were developed as a perfectly matched unit. The result is explosive power delivery and spontaneous throttle response even at low RPMs.
A clear upgrade for riders who expect maximum power, reliability, and consistent performance throughout the entire race.
Details Polini P.R.E. 4 Aluminum Cylinder
- 100cc high-end aluminum cylinder (FL)
- Bore: 52mm
- 5 transfer ports, bridged exhaust port
- Compression: 16:1
- Squish: 0.65mm
- Modular cylinder head with lateral water connection
- For Piaggio short (Zip SP) and Minarelli horizontal (Jog RR)
How to Install a cylinder on a scooter, motorcycle or moped
The cylinder or cylinder kit is the heart of the engine on scooters, motorcycles and mopeds. It consists of a cylinder, a piston with piston ring(s), a cylinder head and gaskets needed for installation.
The service life of a cylinder depends on whether it has been fitted correctly.
Tuning Level: High End racing
We categorize our products into different performance levels Original, Sport, Racing and High End , so that our customers can choose the right parts for their setup. It is really important to combine parts that belong to the same tuning level, this is especially true for cylinders, crankshafts and exhausts.
High End Racing products are exclusively designed for racing and should only be handled by tuning pros with the appropriate technical know-how. High-end racing parts often require modifications or machining of certain elements to accommodate the often larger components (larger crank webs, larger intake, etc.). Whether you stick with 50cc or increase the displacement, high-end racing parts offer much higher performance than the original parts and are the most powerful tuning parts.
Note: To ensure the reliability of the engine, it is important that the parts are compatible and that you do regular maintenance on your two-wheeler.
Aluminium cylinders
Aluminium cylinders are more powerful than cast iron cylinders, but require more regular maintenance and must be combined with different components such as a reinforced crankshaft and a larger carburetor.
How to run in an aluminium cylinder?
Aluminium cylinders should be run in for about 200 kilometers , and you should use a fully synthetic engine oil.
Note: To ensure optimum performance and reliability, it is advisable to measure the squish clearance. Just have a look at our tutorial How to adjust squish clearance.
