Stihl MS 251 Manual De Instrucciones página 10

English
Misaligned, Damaged or Broken Cap
WARNING
A B
1
1
2 2
If the cap does not drop fully into the fuel
tank opening when the positioning
marks (1, 2) line up, or if it does not
tighten properly when turned, the base
of the cap may be prematurely rotated in
relation to the top. Such misalignment
can result from handling, cleaning or an
improper attempt at tightening.
Illustrations A and B: The base of
–
the cap is prematurely rotated to the
closed position and is not in the
correct starting position for
installation. The tank will not seal in
this configuration. Note: in
Illustrations A and B, the interior
positioning marks (1) are in line with
the exterior position marks (2).
Illustration C: The bottom of the cap
–
is in the correct starting position for
installation. Note: In Illustration C,
the interior positioning mark (1) is
under the grip and not in line with
the outer position mark (2).
To return the base of the cap to the
proper starting position for installation:
8
C
1
Turn the cap (with the grip up) until
N
2
it drops into the fuel tank opening.
Next, turn the cap counter-
N
clockwise as far as it will go
(approximately 1/4 turn). This will
rotate the base of the cap into the
correct starting position for
installation. The exterior positioning
mark (1) on the cap will line up with
the "unlocked" symbol (2) on the
fuel tank housing.
Then, turn the cap clockwise,
N
closing it normally.
If your fuel cap still does not tighten
properly, it may be damaged or broken.
Stop using the chain saw and take it to
your authorized STIHL dealer for repair.
Vapor Lock
WARNING
Vapor lock occurs when fuel in the fuel
line or carburetor vaporizes, causing
bubbles to block the free flow of liquid
fuel into the carburetor. Vapor lock
cannot be relieved or affected by
opening the fuel tank. Removing the fuel
filler cap without first allowing the chain
saw to cool adequately can result in fuel
spraying. Always follow the instructions
in this section when removing the fuel
cap.
To relieve vapor lock:
Place the Master Control Lever in
–
1
the cold start position l and pull
the starter cord approximately 20
times to clear the vapor and send
liquid fuel into the carburetor.
To start the chain saw, move the
–
2
Master Control Lever to the starting
throttle position n and pull the
starter cord approximately 10 times.
If your chain saw will not restart, or
–
if vapor lock occurs again, the chain
saw is being used in conditions too
extreme for the fuel being used.
Discontinue use and let the engine
cool completely before attempting
to start the chain saw.
Before Operation
Take off the chain guard (scabbard) and
inspect the chain saw for proper
condition and operation. (See the
maintenance chart near the end of the
instruction manual.)
WARNING
Always check your chain saw for proper
condition and operation before starting,
particularly the throttle trigger, throttle
trigger lockout, stop switch and cutting
attachment. The throttle trigger must
move freely and always spring back to
the idle position. The Master Control
Lever / stop switch must move easily to
STOP, 0 or †. Never attempt to modify
the controls or safety devices.
WARNING
Check fuel system for leaks, especially
the visible parts, e.g., filler cap, hose
connections, manual fuel pump (only for
MS 251, MS 251 C