Rotax 503 UL - Technical data

L7)
Technical data:
DESCRIPTION:
BORE:
STROKE:
DISPLACEMENT:
COMPRESSION
/rha^sri^rl\
POWER OUTPUT:
MAX. RPM
CYLINDER:
PISTON:
PISTON/CYLINDER
RANCE:
RATIO:
CLEA-
Section 17
twin cylinder-, two
stroke
Otto engine, lublicated
by fuevoil
mixtule, air-cooled
by fan
72,0 mm
(2,84
in.)
61 ru!
(2,40
in.)
496,7 c.c.
(30,31
cu.in.)
10,8
single carb.: 34,0 kW
(46
hp
)
pcak power
r.p.m.
6500
6600
dual carb-:
37,0 kw
(50,0
hp
)
for all above
types 6800 l/min.
2 light alloy
cylinders with cast iro[ sleeve
aluminium
cast
piston
witl 2
piston rings,
one semi-trapez dng
(top)
and one lectangular ring
(bottom)
0,07
+
0,08 mm
(.0028 +
.0032
in,)
CHT:
(cyl.
head temperature)
normal:
180-220oC
(355-430
oF)
mzx.:
25OoC
(480
oF)
difference
b€tween 2 cyl. 20oC
(
36'D
ECT:
(exhaust
gas
temperature)
TEMPERATURES
OPERATIONAL
VALTJES:
normal:
max.:
difference
betwcen 2 cyl.
460-580
oC
(860-1080
oF)
650
oC
(1200
oF)
2soc
(
45
oF)
IGNTNON SYSTEM:
IOMTIONTIMING:
PICKI'P
CAP;
crankcase temp. max.:
80oC
(175oD
breakerless DUCATI
capacitor discharge dual
ignition
with
dagneto genemtor.
1,47 mm
=
.059 in.
(16
o)
BmC
0,45
+
0,55 mm
(.018
+
.022
in.)