MXS Cylinder Kit "GP90" stroke=46mm AM6
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This product is no longer being manufactured, so unfortunately we can no longer offer it.
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Description
The MXS 90cc Cylinder Kit GP2 (46mm stroke) Minarelli AM6 has an original patented design and includes a 90cc cylinder (d=50mm / stroke=46mm).
Among the new developments for version GP2 - differently shaped exhaust ports and a newly designed combustion chamber for the cylinder head to boost the performance of the MXS cylinder kit even more. In combination with the right components, but without any additional modification, this kit can reach between 29 and 31hp. The special transfer port design will give you phenomenal torque of 18N·m - even in the low rpm range!
The MXS GP2 90cc cylinder is very powerful at take-off, has impressive acceleration and top speed. Thanks to well-thought-out design and the use of top quality materials this kit is also top-of-the-line regarding reliability and durability (manufactured in Europe).
The kit has to be combined with the MXS crankshaft GP 46mm stroke, the MXS exhaust GP90, a 30mm carburetor (38mm would be ideal), a high-end racing clutch with as many discs as possible, a racing transmission (Bidalot) and a digital inner rotor ignition (Stage6 R/T or Bidalot).
Note:
- You'll have to mill in the front of your crankcase a little to make room for the connecting rod and the piston base (manual included)
- It is possible to get even more power out of this kit by using a racing combustion chamber for the cylinder head that is sold separately (can only be run with high-octane fuel); the kit can now easily reach 31 / 32hp.

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.