Honda MBX50, Workshop Manual

Page: 38 / 194

i-UEL SYSTEM
GENERAL INSTRUCTIONS
o Use caution when working with gasoline. Always work in a well-ventilated area and away from sparks or flames.
0 The float bowl has a drain plug that can be loosened to drain residual fuel.
0 When disassembling fuel system parts, note the locations of the 0-rings. Replace them during assembly.
TOOL
Common
Float Level Gauge
SPECIFICATIONS
Venturi dia.
Setting mark
Main jet
Main air jet
Jet needle
Slow jet
Float level
Air screw opening
Idle speed
Throttle grip free play
Engine cranks but won't start
1. No fuel in tank
2. No fuel to carburetor
3. Too juch fuel getting to cylinder
4. No spark at plug (ignition malfunction)
5. Air cleaner clogged
Engine Idles roughly, staiis, or runs poorly
1. Idle speed incorrect
2. lgniton malfunction
3. Low compression
4. Rich mi)(ture
5. lean mixture
6. Air cleaner clogged
7. Air leaking into inlet pipe
8. Fuel contaminated
07401-0010000
MBX50
I
MBX80
I
SW,B,SA(Free) SW,B(Limited)
E
G
1 6mm(0.63in)
�
13mm(0.51 in) 1 8mm(O. 71 in)
PF16A PF16E PF06D
PF26D
#125 #60
#130
#210 #210
#210
3 7V-2nd groove 3 7 F-2 nd groove 37Y-2nd groove
#45 #42 #40
13.5mm(0.53in)
- -
1 -1 /2 turns out
�
1 · 1 '4turns out
1turn out
1,400min-1(rpm)
- - -
2-6mm[t .'8-1 /4in)
-·
-
-
Lean mi)(ture
1. Carburetor fuel jets clogged
2. Fuel cap vent clogged or blocked
3. Fuel filter clogged
4. Fuel line kinked or restricted
5. Float valve faulty
6. Float level too low
7. Air vent tube clogged
Rich mi)(turn
1. Choke stuck closed
2. Faulty float valve
3. Float level too high
4. Carburetor air jets clogged
F
<----
PF26F
#90
<------
-
-
-
-
<------
-
E
-
PF26G
#140
-
-
-
-
-
-
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