53
FC 75, FC 85, FH 75, FS 75, FS 80, FS 85, HL 75, KM 85, KW 85
– Adjust idle speed with a
tachometer. Adjust specified
engine speeds within a tolerance
of +/- 200 rpm.
1. Adjust engine speed with idle
speed screw (
LA
) to 3,300 rpm.
2. Turn low speed screw (
L
)
clockwise or counterclockwise
to obtain maximum engine
speed.
If this speed is higher than
3,700 rpm, abort the procedure and
start again with step 1.
3. Use the idle speed screw (
LA
)
to set engine speed again to
3,300 rpm.
4. Set the engine speed to
2,800 rpm with the low speed
screw (
L
).
Always install new limiter caps.
Limiter caps that have been
removed once may be damaged
and must not be re-used.
Installing short limiter cap
:
Line up the
new cap
for the high
speed screw (
H
) against the rich
stop and press it on only as far as
the
second noticeable detent
position.
VA
249RA129
270°
The stop limits the adjustment
range of the high speed screw (
H
) to
a 3/4 turn. Do not press the cap
against the carburetor body as it will
otherwise be damage.
– Carry out the user adjustment,
Installing long limiter cap
:
Line up the
new cap
for the high
speed screw (
H
) against the rich
stop so that the high speed
screw
(H)
can only be rotated a
3/4 turn clockwise.
VA
392RA318
270
:
Push on the limiter cap until it
butts against the carburetor body.
– Carry out the user adjustment,
