The AC version of the Malossi cylinder kit comes with a completely revised porting layout and gives additionally an nice increase of cubic inches. This gives a nice power and torque increase.
The Malossi is a very reliable kit, but -as all air cooled two stroke engines- the reliability depends on a proper ignition and carb setting.
Highly recommended is the 25mm Malossi carb kit which is available in a pre-jetted version for this kit.
When there is a racing exhaust used or a sport air filter you have to adjust the settings.