Maico MC 250, Instruction Book And Service Manual

Page: 33 / 33

SHOP
BULLETIN
#2
400cc
400CC
400cc
400cc
501cc
250cc
250cc
250cc
I
4
1
6DP
1
1
0
6DH
6fJ
Needle Needle-Kotches
from
2
2
2
2
2
2
5
3
lean
oosition
159
159
159
1610
275-280
0-5
285-
290
280-285
109
p-o
1)-5
Needle
Jet
--
5
1
2.5
1
1
3.0
2.0
1,5
Slide
-----
35
40
35
35
40
20
35
35
Pilot
Jet
I
,
-
-
2.0
-
-
-
2.0
2.0
Po
ir
Jet
i
1,5
I
1,5
1,5
1,5
1,5
1,5
1,5
2.0
1
1/2
Air
Screw
(Turns)
'-
165
170-180
210
180-190
17
5-18
5
I
420
270
310
Main
Jet
Engine
Timing
3.0
2.7
2.7
3.5
3.8
3.8
3.8
__
,_,l-,~
BTDC
(mm)
----"----
----------_.
30
36
34
36
36
I
36
34
36
Carburettor
(mm)
Binz
Bin~
,
Mikuni
BinR
Bin:7
!
Amal
Mikuni
Mikuni
Size
and
Make
Champion
spark
L-2G
L-2G
L-2G
N-2G
L-2G
L-2G
L-2G
L-2G
nlup-.
GAP
at
.022-.024
L-3
L-3G
L-3G
-
-
i
-
-
-
Hot
Plug
I
This
jetting
was
developed
using
a
Zollner
engine
dynomometer
at
C.R.
Axtell's
in
Glendale,
Calif.
The
jetting
is
for
maximum
horse
power
Sea
level
to
about
3500
feet.
If
jetting
changes
are
required
always
chanp,e
the
pilot
jet
first,
then
the
needle
jet,
then
slide,
then
the
main
jet.
for
a
rouf.h
rule
of
thumb
reduce
the
jet
sizes
10%
for
every
5000
feet
of
altitude
ie
40
pilot
to
35
then
to
30.
NOTE:
The
Bing
Carburettor
is
usuallv
supplied
one
needle
jet
too
rich.
Carburettor-Jettin~
for
sea
level
SHOP
BULLETIN
#2
400cc
400CC
400cc
400cc
501cc
250cc
250cc
250cc
I
4
1
6DP
1
1
0
6DH
6fJ
Needle Needle-Kotches
from
2
2
2
2
2
2
5
3
lean
oosition
159
159
159
1610
275-280
0-5
285-
290
280-285
109
p-o
1)-5
Needle
Jet
--
5
1
2.5
1
1
3.0
2.0
1,5
Slide
-----
35
40
35
35
40
20
35
35
Pilot
Jet
I
,
-
-
2.0
-
-
-
2.0
2.0
Po
ir
Jet
i
1,5
I
1,5
1,5
1,5
1,5
1,5
1,5
2.0
1
1/2
Air
Screw
(Turns)
'-
165
170-180
210
180-190
17
5-18
5
I
420
270
310
Main
Jet
Engine
Timing
3.0
2.7
2.7
3.5
3.8
3.8
3.8
__
,_,l-,~
BTDC
(mm)
----"----
----------_.
30
36
34
36
36
I
36
34
36
Carburettor
(mm)
Binz
Bin~
,
Mikuni
BinR
Bin:7
!
Amal
Mikuni
Mikuni
Size
and
Make
Champion
spark
L-2G
L-2G
L-2G
N-2G
L-2G
L-2G
L-2G
L-2G
nlup-.
GAP
at
.022-.024
L-3
L-3G
L-3G
-
-
i
-
-
-
Hot
Plug
I
This
jetting
was
developed
using
a
Zollner
engine
dynomometer
at
C.R.
Axtell's
in
Glendale,
Calif.
The
jetting
is
for
maximum
horse
power
Sea
level
to
about
3500
feet.
If
jetting
changes
are
required
always
chanp,e
the
pilot
jet
first,
then
the
needle
jet,
then
slide,
then
the
main
jet.
for
a
rouf.h
rule
of
thumb
reduce
the
jet
sizes
10%
for
every
5000
feet
of
altitude
ie
40
pilot
to
35
then
to
30.
NOTE:
The
Bing
Carburettor
is
usuallv
supplied
one
needle
jet
too
rich.
Carburettor-Jettin~
for
sea
level
Maico 72-74.5 Radial Manaual
www.maicowerk.com
Courtesy of vintagemaico@gmail.com