Description
Polini EVOLUTION P.R.E. 4 – Racing Technology for Top Performance
With the new EVOLUTION P.R.E. 4 product line, Polini is once again setting the standard in scooter racing. Available in 70cc and 100cc, these parts are developed for Piaggio or Minarelli engines using a flange-mount crankcase.
Polini PRE 4 Exhaust
A key part of the P.R.E. racing engine is the P.R.E. high-performance exhaust, specifically designed to get the most out of the matching cylinder kit's power characteristics.
Each section of the exhaust system is laser-cut to ensure pinpoint precision before being hand-assembled by specialized technicians.
The 70cc racing exhaust is designed to be used with the perfectly matched P.R.E. 4 cylinder and P.R.E. 4 crankshaft. It is intended for use with high-end tuning crankcases such as the Malossi C-One, Polini P.R.E., 2Fast Passion, or 8.1 Fireblade.
Polini Racing Engine – Perfectly Tuned Racing Kit
The new PRE 4 set consists of a cylinder, crankshaft, and exhaust developed to work together as a single unit. This results in explosive power delivery and instant throttle response even at lower RPMs.
It is a clear upgrade for riders looking for maximum power, reliability, and consistent performance throughout a race.
Polini P.R.E. 4 Racing Exhaust Details:
- 70cc racing exhaust
- Black aluminum silencer
- Fits Piaggio short (Zip SP) and Minarelli horizontal (Jog RR)
Exhaust scooter, moped, motorcycle
The exhaust has a major influence on the performance of scooters and mopeds. By replacing the original with a tuning exhaust, you can improve the gas flow and increase the engine power.
exhaust parts
- The headpipe or header is the connection between cylinder and exhaust, and an exhaust gasket provides the necessary seal. In street-legal systems, the headpipe is equipped with a legally required restriction. Some people remove this restrictor to increase power.
- The actual exhaust body or expansion chamber is connected to the header pipe. In a classic 2-stroke expansion chamber type exhaust, gas pressure waves are used to improve engine performance.
- At the end there us the silencer or muffler that discharges the exhaust gases and, with the help of damping wool, also reduces the noise generated by the vehicle.
Replacing the exhaust
As a general rule, please check if the exhausts fits BEFORE REMOVING THE RESTRICTOR, otherwise the exhaust cannot be returned.
For 2-stroke engines, various settings and components usually need to be adjusted when the original exhaust is replaced with a tuning version. These changes include:
- Adjusting the carburetor by replacing the main jet.
- Upgrading the clutch or replacing the clutch springs.
- For scooters, it may be necessary to reduce the weight of the variator weights.
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.