Description
The kit includes:
- 94cc Aluminium Cylinder “Big Evo”, d = 52mm / stroke = 44mm / conrod = 85mm, with 6 transfer ports and a bridged exhaust port
- Single-Ring Piston, 13mm pin, d = 52mm (for small end bearing 13x17x17.7mm)
- High-Compression Monobloc Cylinder Head
- Gasket Kit for mounting and adjusting squish
- Stud Bolt Set
This kit is the biggest cylinder kit for scooters available at the moment, with a 52mm piston and a 44mm stroke, it ends up having 94cc displacement giving it a lot of torque. The kit falls into the "Hyper Racing" category and can reach between 23 and 25hp, provided that it is combined with the right components (Polini exhaust "Evo 94cc" or Roost exhaust BE94 and a 28-34mm carburetor).
Note 1:The exhaust flange has a different angle than the original (Piaggio flat type) and can only be used with a Polini Big Evo 94cc exhaust (same series).
Note 2:This kit can only be mounted with crankshafts that have a 85mm connecting rod, 44mm stroke and a 13mm pin (small end bearing 13x17x17.7mm), and you'll have to mill in the crankcase to make room for crankshaft and cylinder base.
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.