Tuning Kit Top Performances 77cc Yamaha Aerox
Description
Top Performances engine Kit - 77cc cylinder and crankshaft
Top Performances responds to the needs of scooter riders with this complete engine pack: 77cc 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 77cc aluminum kit for horizontal Minarelli engines (MBK Nitro, Yamaha Aerox, etc.).
Top Performances 77cc aluminum cylinder
Made from aluminum with a protective Nikasil coating, this cylinder features a 50mm bore. 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 40mm stroke, 85mm connecting rod, and 12x15x15mm small end 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 77cc Motorpack belongs in the lower 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 18 to 20 hp.
Comes with 2 crankshaft bearings (C3 polyamide cage) and oil seals.
Note: Minor engine case modifications are required to fit the 56mm cylinder base.

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.
Tuning Kit Top Performances 77cc Yamaha Aerox | |
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Article no. | T9926580 |
Weight | 2,00 kg |
Brand | Top Performances |
Product type | Engine pack |
Tuning level | High-end |
Displacement | 77cc |
Homologation | No |
Piston pin | 12 mm |
Cylinder material | Aluminium |
Bore | 50 mm |
Stroke | Original |
Conrod length | 85 mm |