Vacuum Piston (Cv Type) - Honda Motorcycle Service Manual

FUEL SYSTEM
Remove the jet needle retainer and jet needle from the throttle
valve.
JET NE~JJLE
\
\JET
NEEDLE
NEEDLE CLIP RETAINER
SPRING
I
Check the jet needle for stepped wear. The fuel supply to the
main circuit cannot be adjusted if the jet needle is worn.
THROTTLE VALVE
I
I
VACUUM PISTON ASSEMBLY
VACUUM PISTON (CV
type)
Remove the screws, vacuum chamber cover, spring, and
vacuum piston assembly from the carburetor.
Check the piston for smooth operation in the carburetor body.
Turn the jet needle holder counterclockwise while pressing it i n
and remove
it.
VACUUM
Remove the spring, spring holder, jet needle, needle holder and
washer from the vacuum piston.
NOTE
/
.
Certain models are not eauiooed with a soring holder.
1
Check the jet needle for stepped wear and replace if
necessary.
Check the vacuum piston for damage and replace if necessary.
Check the diaphragm for damage, pin holes, wrinkles and
bends and replace if necessary.
Air leaks out of the vacuum chamber if the diaphragm is
damaged i n any way-even a pin hole.
JET NEEDLE HOLDER
/
VACUUM PISTON
(SPRING HOLDER)
JET NEEDLE
I
DIAPHRAGM JET NEEDLE
/
SPRING
8-1 2
Date of Issue: Sep., 1988
O
HONDA MOTOR CO., LTD.