CYLINDER KIT WITH POWER VALVE SYSTEM
CYLINDER KIT WITH
POWER VALVE SYSTEM
MINARELLI AM 6 Engine
P/N Ø 40mm:
P/N Ø 50mm:
ATHENA is proud to be the first to present a Racing moped Cylinder kit with Exhaust Valve. This revolutionary Cylinder kit has been
developed from ATHENA R&D department for the popular Minarelli AM6 engine in two displacements: 40mm – 50cc and 50mm –
The CYLINDER, made out of Aluminum alloy and plated with special Nickel Silicon coat, has been designed and developed in order
to guarantee the highest performance ever seen in this category of cylinders.
Its big water jackets guarantee best refrigeration, higher reliability and constant performance.
The Exhaust Port is provided with Two Boost Ports and Power Valve System to obtain high torque and horsepower over a wider range
The cast-lite piston, with flat head and Molycote finishing, has been especially designed for this cylinder and tune to the cylinder head
which has a very high compression ratio and squish area.
Exhaust valve gasket
Piston sel. A/B
40mm - 50cc
50mm - 80cc
Ø 40 mm / 50 cc
Ø 50 mm / 80 cc
Closer view of the two cylinder heads respectively for the 40mm and 50mm bore
Cross section view of the cylinder which
show the exhaust valve
POWER VALVE SYSTEM
The two-stroke Power Valve System
varies the duration of the exhaust port
open time, reaching excellent low RPM
and top-end performances.
ATHENA Power Valve System uses a
guillotine valve moved by the pneumatic system, which exploits the exhaust
At low RPM, when the exhaust gas has
low pressure, the Power Valve is kept
closed by a spring inside the pneumatic system.
While increasing RPM, the pressure
of the exhaust gas raises causing the
pneumatic system to move the guillotine valve upwards.
PNEUMATIC CONTROL SYSTEM
Athena suggests to use also:
Minarelli racing clutch case;
Crankshaft rebuilding kit
(2 bearings SKF 6303TN9/C3 + 2 oil seals);
Complete gasket kit;
Engine oil seals kit;
Intake reed valve;
Intake manifold for carburettor Ø 20/26;
Carburettor Dell’Orto PHBG 19 DS;
Carburettor Dell’Orto PHBG 21 BS DS;
Fantic Caballero SM tuned by ATHENA in occasion of the PRESS DAY for the presentation of the Exhaust Valve