Athena

New 70 cc big bore cylinder kit for Yamaha-Minarelli vertical engines (CW)

Newly available from Italian specialist Athena, "innovative technical solutions and unprecedented performance" are said to be the hallmarks of this new big bore cylinder kit for vertical air-cooled 70 cc Yamaha-Minarelli engines.
Used in well-known scooter models from the likes of MBK Booster, Yamaha BWs and the legendary Aprilia SR, this special cylinder kit features patent-pending technical solutions for power that can reach as high as 19 hp.

Features include an entirely reinvented fastening system with the normal stud-based cylinder head and cylinder clamping replaced by special bolts, similar to the system used in racing applications.
This solution reduces cylinder expansion, thereby ensuring more efficient clamping, and allows for a sophisticated redesign of the intake and exhaust port. 

The intake features a CNC-machined fifth port that ensures a greater flow of fresh intake gases, while the oversized exhaust port has an oval geometry with side boosters - a solution that cannot be found on any other cylinder of this type on the market today.
The result is the highest performance cylinder kit of its kind ever conceived.
A special flat-head piston has been developed with a CNC-machined window on the casing, which is designed to maximise the intake flow, thereby delivering greater pressure on the pump casing and better lubrication of the roller cage.
This is just one of a large range of replacement and upgrade components available from Athena for scooters equipped with this engine, such as racing crankshafts, a 28 mm carburetor with dedicated air filter, and the Big Valve System - an intake system with reed valve that further increases and optimises intake gas flow and, therefore, engine operation.

ATHENA
www.athena.eu