Fine Tuning; Tank Vent - Stihl MS 460 Service Manual

: Insert puller 5910 890 4500 in
center of limiter caps, apply slight
pressure and screw home
counterclockwise until the limiter
caps come out of the carburetor
body.
After removing the limiter caps, first
carry out the basic setting.
Make the following adjustments:
–
Open the high speed screw (H) one
full turn.
– Open the low speed screw (L)
one full turn.
– Set the engine speed to
2,500 rpm with the low speed
screw (L).
– If no tachometer is available,
mount the limiter caps, see step 6

Fine tuning

– Check the air filter and clean or
replace as necessary.
– Check and clean or replace spark
arresting screen (if fitted).
– Check chain tension.
– Warm up the engine.
MS 460, MS 460 C
Adjust engine idle speed with a
tachometer. Adjust specified engine
speeds to 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
2,500 rpm with the low speed
screw (L).
5. Set engine's maximum speed
to 13,500 rpm with the high speed
screw (H)
6. Install new limiter caps, noting
that the stop lugs on the limiter
caps must line up with the
openings in the carburetor.
Always install a new limiter cap.
Limiter caps that have been
removed once may be damaged
and must not be re-used.
12.5

Tank Vent

Correct operation of the carburetor
is only possible if atmospheric
pressure and internal fuel tank
pressure are equal at all times. This
is ensured by the tank vent.
In the event of trouble with the
carburetor or the fuel supply
system, always check and clean the
tank vent.
Check function by performing
vacuum test on the tank via the fuel
hose.
1
– Remove the carburetor, b
12.2.1
: Connect vacuum pump
0000 850 3501 (1) to fuel hose
and generate vacuum in fuel
tank.
73