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Version |
Performance |
Torque |
Max RPM |
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kW |
HP |
RPM |
Nm |
ft. lb. |
RPM |
RPM |
503 UL-DCDI
Single Carb |
34.0 |
45.6 |
6500 |
51 |
37.6 |
5900 |
6800 |
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503 UL-DCDI
Dual Carb |
37.0 |
49.6 |
6500 |
56 |
41.3 |
6000 |
6800 |
Rotax 503 engine, 503 Rotax
engine specifications and technical data:
|
| DESCRIPTION: |
Two-cycle, two-cylinder
engine, oil in fuel lubrication |
| BORE: |
72.0mm (2.835 in.)
|
| STROKE: |
61mm (2.40
in.) |
| DIRECTION OF
ROTATION: |
Counter- clockwise, viewed
towards PTO (without reduction gear box) |
| DISPLACEMENT: |
496.7 c.c. (30.31 cu. in.)
|
| COMPRESSION
RATIO: |
Theoretical 10.8 -
effective 6.2 |
| POWER OUTPUT: |
34.0 kw (46 hp)
configuration single carb. |
| MAXIMUM RPM: |
6800 rpm. |
| DIRECTION OF
ROTATION: |
Counter- clockwise, viewed
towards PTO (without reduction gear box) |
| CYLINDER: |
2 light alloy cylinders
with cast iron sleeves |
| PISTON: |
Aluminum cast piston with 2
rings |
| PISTON/CYLINDER
CLEARANCE: |
0.07 - 0.08mm (.0028 -
.0032 in.) |
| IGNITION SYSTEM: |
Breakerless Ducati
capacitor discharge dual ignition with magneto generator.
|
| GENERATOR OUTPUT: |
170 W AC at 6000 rpm and
13.5 V RMS |
| RECTIFIER-
REGULATOR: (optional) |
a.) #9103 requires min.
load 12 W (1 amp) to regulate |
| b.) #9251 requires no min.
load |
| IGNITION TIMING: |
1.47mm = .059 in. (16
degrees B.T.D.C.) |
| SPARK PLUG: |
14 mm NGK B8ES |
| ELECTRODE GAP: |
.015 in. |
| CARBURETOR: |
1 x BING 36mm (1.42 in.)
hand lever choke |
| FUEL PUMP: |
pneumatic fuel pump #6903
for single carb |
| FUEL: |
Regular or premium
gasoline, octane not lower than 90 octane (unleaded fuels)
|
| LUBRICATION OF
ENGINE: |
Super 2- stroke oil (AV-2),
proposed ASTM/CEC |
| STARTER: |
Rewind starter -
standard |
| (optional) |
electric starter, magneto
side without rewind starter |
REDUCTION GEARBOX
"B":
(optional) |
Reduction gear box with
torsional shock absorber, for propeller interia up to 3000 kg cm sq.
|
REDUCTION GEAR BOX
"C":
(optional) |
Reduction gear box with
torsional shock absorber, for propeller interia up to 6000 kg cm
sq. |
| RATIOS: |
2.62 to 1, 3.00 to 1, 3.47
to 1, 4.00 to 1. |
| LUBRICATION OF GEAR
BOX: |
Gear oil, GL5 or GL6, SAE
140EP, or 85 W-140 EP |
| DIRECTION OF PROP SHAFT
ROTATION: |
Clockwise, viewed towards
propeller flange. |
| COOLING: |
Air cooled by axial
fan |
| WEIGHT: |
Engine wo/: carburetor, air
filter, fuel pump, exhaust
system...................................................67.0
lbs.......(30.4 kg ) |
| 2 carbs w/
sockets...................................4.0 lbs........(1.8 kg
) |
| exhaust system
assy...............................0.8 lbs........(4.9 kg
) |
| 2 air
filter.................................................0.6
lbs........(0.3 kg ) |
| electric start kit, mag
end.1.......................7.7 lbs........(3.5 kg) |
| start kit, mag
end.1...................................7.7 lbs........(3.5 kg
) |
| Reduction box
"B"....................................9.9 lbs........(4.5 kg
) |
| Reduction box
"C"..................................6.3 lbs........(8.1 kg
) |
OPTIONS:
- Intake Silencer Kit with filter
(requires jetting modifications)
- After Muffler: Special after
muffler fitted to exhaust canister (available in either weld-on
type or clamp-on type)
- Air filter: Two K&N RC 1200 or
One K&N RC 2820
- High Altitude Compensator:
Automatic High Altitude adjustment of Carburetor calibration with
modified Carburetor
- Electric Start Kit: Electric start
on MAG end.
- Regulator/ Rectifier: #9103 Single
phrase or #9251 three phase
- Reduction Box: "B" box with ratios:
2.0 to 1, 2.238 to 1, or 2.58 to 1
- Reduction Box "C" box with ratios:
2.62 to 1, 3.0 to 1, 3.4 to 1, 4.0 to 1
Rotax Engine Rebuilding Videos
Rotax engine
rebuilding videos, each video is approximately 2 hours in length and
takes you step by step through the tear down, clearing, and
reassembly of a Rotax engine
Click
here for more information! |
