3203 2-cycle 65hp
(Replaced Hirth 2706 - May 2002)

Hirth's most popular engine! The 3203 produces more horsepower and torque per pound than any other engine in its class. The Hirth 3203 is the forerunner in powerplants for the heaviest of ultralight trainers, gyrocopters and light experimentals today. Factory recommended TBO is rated at 1000hrs @ 75% power.

The 3203 incorporates Al-Nikasil coated cylinders for superior performance and reliability. Al-Nikasil in simple terms is a nickel based material, applied in a paste form, when super heated it becomes part of the cylinder itself. Al-Nikasil provides for a super low coefficient of friction, reducing engine heat and wear. The pistons and cylinders expand at the same rate thus providing for a seizure resistant engine. 3203 crankshaft is 4130 chromemolly steel. Heads, cylinders, rings, block casting, connecting rods and associated components are all of the highest grade alloys available.

Please contact Customer Service for current pricing. The 3203 Series can be quoted with or without the following options: • Electric or Recoil Start • Reduction Drive • Single or Dual Ignition • Fuel Injection or Carbureted • Oil Injection

The 3203 65hp is Hirth's most popular engine. Model: 3203 Engine Type: 2-cycle, 2-cylinder Bore: 76mm Stroke: 69mm Displacement: 625cc Compression: 9.5:1 HP Output: 65hp @ 6300rpm Torque: 55ft-lbs @ 6000rpm Ignition: Dual CDI (Capacitive digital Ignition) Carburation: Dual 34mm slide or optional electronic fuel injection Fuel Pump: Auxiliary external pneumatic/electric pump with fuel injection Lubrication: Fuel mixed with oil @ 50:1 or optional oil injection Rotation: Counter clockwise, viewed from output end Starter: Alternator: 12 volt electric, recoil, or both 250 watt/20 amp alternator standard Cooling: Fan cooled Weight: 79lbs, fan cooled including electric start and exhaust. Optional gearbox adds 19lbs Reduction Units: G-50 gearbox available in 2.16:l, 2.29:l, 2.59:l, 3.16:l and 3.65:l ratios Cog belt drive also available. Drive Coupling: Elastomeric dampener or optional centrifugal clutch

ENGINE DIMENSIONS PRINT

EXHAUST PRINT

CUSTOMER PHOTO GALLERY

3203 installed on Challenger Photo #1 | Photo #2	3203's installed in Paraski twin engine PPC Picture #1 | Picture #2 Picture #3	2706 installed in Mini 500 helicopter
Two 2706's installed in VSTOL twin engine spray plane	2706 installed in Kolb Mark III	2706 installed in Rans S12
2706 installed in Sky Twister helicopter	2706 installed in Fisher Classic Biplane	2706 installed in Sno Bird Gyro
2706 installed in US Light Aircraft Hornet	2706 installed in ASAP Beaver 550	2706 installed in CGS Hawk
2706 installed in Xair Picture #1 Picture #2	2706 installed in custom dual prop KOLB MKIII Picture #1 | Picture #2	3203 on Kalb Firestar II SS Picture #1 | Picture #2 Picture #3 |Picture #4