Suzuki RM250 Owner's Service Manual page 39

MACHINE TUNING 4-6
Jet needle
Ex _
Main jet
#
1 80
Air/fuel
If air/fuel mixture is rich , replace it with
SIZE P/NO
mixture
#
178 main jet. If air/fuel mixture is
Lean R1473 NS 13383-28E90
lean, repla ce it with # 185 main jet.
1
a-
R1473 MS
13383-28 E80
R1472 NS 13383-28E70
@
Adjustment of inte rmediate system
R1472 MS
13383-28 E60
R1471 NS 13383-28E50
~1
R1471 MS
13383-28 E40
? '
I
L.an
?
3 ··· ·STD
R1470 NS 13383-28E30
•
I
A;"
5
R1470MS 13383-28E20
R1469 NS 13383-28 E 1 0
'----
Ri ch R1469 MS 13383-28EOO
NOTE:
Monitor the air/fuel mixture condition and adjust
SHADED : STANDARD
the intermediate syste m by changing the needle
•
: ATTACHED SETTING PARTS
cl ip position.
NONE : OPTIONAL PARTS
®
Final adjustment of slow system
After a proper standard setting has been obtained
CD
Adjustment of slow system
by the procedure
CD
through
®.
fine tune the car-
l ) Set the air sc re w as specified .
buretar according to the actual race conditions .
2) See if the
selected slow jet is correct or not
by judging the air/fuel mixture. If air/fuel mix-
1 ) Adjust the air/fuel mixture by turning the air
ture is rich , repla ce it with smaller one. If
scre w within 1/ 2 - 2 turns out.
air/fuel mixture is lean , replace it w ith larger
1/2 turn out
one .
1-1f.! turns out
2 turns out
2)
If
the mixture can not be adjusted by the air
Ex. Slow jet
#
52 screw within 1/2 - 2 turns out range, readjust
If air/fuel mixture is ri ch, replace it with
the slow system
®.
#
50
slow jet. If air/fuel mixture is lean.
repla ce it wi th #
55
slow jet.
®
Final adjustment of intermediate system
®
Adjustment of main system
Fine tune the intermediate system by changing
With the throttle opened 3/4 to fu ll. make main
the needle type and clip position .
system adjustment monitoring the air/fuel mix-
ture condition after completion of slow system
settings .
•
Make sure to adjust the main system before
adjusting the intermdiate system .