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

Top Performances engine Kit - 86cc cylinder and long-stroke crankshaft

Top Performances responds to the needs of scooter riders with this complete engine pack: 86cc tuning kit for MBK Nitro / Aerox (horizontal Minarelli) at a great price. Known for high-performance Big Bore kits for 50cc motorcycles, Top Performances now brings that expertise to scooters with this convincing 86cc aluminum kit for horizontal Minarelli engines (MBK Nitro, Yamaha Aerox, etc.).

Top Performances 86cc aluminum cylinder

Made from aluminum with a protective Nikasil coating, this cylinder features a 50mm bore and 44mm stroke. It has 6 transfer ports and a bridged exhaust port. The high-compression two-piece cylinder head includes a direct-flow combustion chamber. The large exhaust port delivers strong top-end power. A cooling channel completely surrounds the exhaust area for optimal heat dissipation.

Top Performances Racing Crankshaft

The included reinforced full-circle racing crankshaft features a 44mm stroke, 85mm connecting rod, and 12x15x15mm wrist pin bearing. As expected from a high-end crank, the balance inserts are made of high-quality tungsten.

Power - Top Performances engine kit for Minarelli horizontal

This 86cc Motorpack belongs in the high-end racing category. With the right components — at least a 28mm carburetor, inner rotor ignition, and a high-end racing exhaust — you can achieve 20 to 24 hp. Thanks to the optimized bore/stroke ratio, it offers not just peak power but also more torque and a smoother power curve compared to similar short-stroke setups.

Comes with2 crankshaft bearings (C3 polyamide cage) and oil seals.

Note: Minor engine case modifications are required to fit the 56mm cylinder base and 44mm crankshaft.