avia.wikisort.org - Engine

The JPX PUL 425, also called simply the JPX 425, is a French twin-cylinder, horizontally opposed, two-stroke aircraft engine.[1]

JPX PUL 425
Two JPX PUL 425s mounted on a Lazair 2
Type	Two-cylinder two-stroke engine
National origin	France
Manufacturer	JPX
Produced	until the early 1990s

The engine was produced only until the company went out of business in the early 1990s. The company was re-formed but the engine remains out of production and unsupported for parts.[1]

Design and development

The engine has two cylinders in a horizontally opposed configuration, with cooling fins on the cylinders. The single ignition system uses a coil and points. Fuel is metered by a single Tillotson butterfly-type carburetor. Starting is by a recoil starter system with electric start as an option.[1]

The 425 has a redline rpm of 4600 and does not use a reduction drive. Its weight of just 38 lb (17 kg) gives the engine a high power-to-weight ratio.[1]

Applications

• Latécoère 225
• Lazair 2
• Lazair SS
• Lazair Series III
• Zenair Zipper

Specifications (425)

Data from Cliche[1]

General characteristics

• Type: twin-cylinder, two-stroke engine
• Displacement: 424 cc (25.87 cu inches)
• Dry weight: 38 lb (17 kg)

Components

• Fuel system: Tillotson butterfly-type carburetor
• Oil system: premixed oil and fuel
• Cooling system: air cooled

Performance

• Power output: 26 hp (19 kW) at 4600 rpm

See also

• Kawasaki 440
• Rotax 377
• Hirth F-263
• Hirth F-33

References

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