CARBURETOR
4-11
E
FUEL
CHECKING THE CARBURETOR
CAUTION:
Do not use a steel wire to clean the jets.
This may enlarge the jet diameters and seri-
ously affect performance.
1. Check:
•
Carburetor body
Cracks/damage
→
Replace.
Contamination
→
Clean.
2. Check:
•
Main jet
•
Pilot jet
•
Main nozzle
Contamination
→
Clean.
3. Check:
•
Needle valve
Grooved wear
→
Replace.
4. Check:
•
Float
Cracks/damage
→
Replace.
5. Check:
•
Pilot screw
Damage
→
Replace.
ASSEMBLING THE CARBURETOR
1. Install:
•
Needle valve
•
Float
•
Float pin
•
Screw
NOTE:
• The float pin should fit into the slit in
the carburetor and be retained with the
screw.
• When installing the float into the carbu-
retor, place the needle valve into the
needle valve seat.
• After installation, make sure that the
float operates smoothly.
3
1
2
1
2
3
Summary of Contents for F40BMHD
Page 126: ...GENERAL 3 25 E CHK ADJ LUBRICATION POINTS Apply Water resistant grease ...
Page 128: ...CHK ADJ 3 26 GENERAL E ...
Page 129: ...3 26 CHK ADJ F D ES ...
Page 528: ......
Page 529: ......
Page 536: ......
Page 537: ...Printed on recycled paper Printed in Japan Sep 1999 1 7 1 F40B YAMAHA MOTOR CO LTD ...