Tuning Kit Top Performances 86cc cylinder + crankshaft stroke=44mm Yamaha Aerox

Top Perfamces has responded to popular demand and assembled a tuning kit, finally available for scooters: the Top Performances 86cc Tuning Kit (cylinder + 44mm stroke crankshaft) MBK Nitro / Aerox (Minarelli horizontal LC). With an excellent reputation regarding 50cc bikes/mecaboites already established, Top Performances came up with this 86cc Aluminium Tuning Kit for scooters with horizontal Minarelli LC engines (MBK Nitro, Yamaha Aerox, etc.).

The cylinder is made of Nikasil-plated aluminium with a 50mm diameter and 44mm stroke, has 6 transfer ports, a bridged exhaust port and a modular high compression cylinder head. The exhaust port is very "large" across its entire width giving it a unique look. Special attention was also given to the cylinder's external surface with a cooling canal enclosing the entire exhaust port for optimum cooling.

The crankshaft included in this Top Performances 86cc Tuning Kit MBK Nitro / Aerox is a reinforced full-circle racing crankshaft with "extended" stroke - 44mm, 85mm conrod, small end bearing 12x15x15mm. One of the unique features characterizing high-end crankshafts is the use of Tungsten weights instead of standard "caps" for balancing.

Regarding performance, the Top Performances 86cc Tuning Kit MBK Nitro / Aerox is a Hyper Racing kit and develops 20/22hp in combination with the proper components:
- min. 28mm carburetor
- digital inner rotor ignition
- “Hyper Racing” exhaust.

This Top Performances Tuning Kit 86cc (cylinder kit + 44mm stroke crankshaft) MBK Nitro / Aerox includes two crankshaft bearings (C3 Polyamide cages) and oil seals.

Note: the crankcase has to be milled to make room for the 44mm crankshaft, and also for the cylinder base (d=56mm).