TECHNICAL DATA 20
117
20.3 Carburetor
Carburetor type KEIHIN PWK 28
Needle position 3rd position from top
Idle air adjusting screw
open 2 turns
Main jet 142 (140, 145, 148)
Jet needle NRKC (NRJC)
Idling jet 48 (45, 50)
Throttle slide 3
Choke nozzle 62
20.3.1 Basic carburetor setting for sandy surfaces
Idle air adjusting screw 2 turns
Idling jet 48
Jet needle NRJ C
Needle position 4th position from top
Main jet 148
Info
If the engine is not running smoothly, use a smaller main jet.
20.3.2 Carburetor tuning
KEIHIN PWK 28
ASL TEMP
−20 … −7 °C
(−4 … 19 °F)
−6 … 5 °C
(21 …
41 °F)
6 … 15 °C
(43 …
59 °F)
16 … 24 °C
(61 …
75 °F)
25 … 36 °C
(77 …
97 °F)
37 … 49 °C
(99 …
120 °F)
2,301 …
3,000 m
(7,549 …
9,843 ft)
ASO
IJ
NDL
POS
MJ
2
48
NRK C
3
142
2
45
NRK C
3
142
1.5
42
NRK C
3
140
2
42
NRK C
3
138
1.5
42
NRJ C
3
138
1,501 …
2,300 m
(4,925 …
7,546 ft)
ASO
IJ
NDL
POS
MJ
2
48
NRK C
3
145
2
48
NRK C
3
142
2
45
NRK C
3
142
1.5
42
NRK C
3
140
2
42
NRK C
3
138
1.5
42
NRJ C
3
138
751 …
1,500 m
(2,464 …
4,921 ft)
ASO
IJ
NDL
POS
MJ
2
48
NRJ C
4
145
2
48
NRK C
3
145
2
48
NRK C
3
142
2
45
NRK C
3
142
1.5
42
NRK C
3
140
2
42
NRK C
3
138
301 …
750 m
(988 …
2,461 ft)
ASO
IJ
NDL
POS
MJ
2
48
NRJ C
4
148
1.5
48
NRK C
3
148
2
48
NRK C
3
145
2
48
NRK C
3
142
2
45
NRK C
3
142
1.5
42
NRK C
3
140