Black Max BM25CSEDG Operator's Manual page 18

PROBLEM
Engine does not reach full
speed and emits excessive
smoke
Engine starts, runs, and
accelerates but will not idle
Line will not advance
Spool retainer hard to turn
Grass wraps around drive
shaft housing and string head
Engine starts and runs but
string head does not turn
If problem persists after trying the above solutions, contact customer service or a qualified service center for assistance.
NOTICE:
As the equipment owner, you are responsible for the performance of the required maintenance listed in the Maintenance
section. It is recommended that you retain all receipts covering maintenance on your equipment. Neglecting or failing to
perform the required maintenance may increase emissions, decrease fuel efficiency, degrade performance, cause irrevers-
ible engine damage and/or void your warranty.
TROUBLESHOOTING
POSSIBLE CAUSE
Incorrect lubricant/fuel mixture
Air filter screen is dirty
Spark arrestor screen is dirty
Spark plug fouled
Idle speed screw on carburetor
needs adjustment
Line is welded to itself
Not enough line on spool
Line is worn too short
Line is tangled on spool
Engine speed is too slow
Screw threads are dirty or dam-
aged.
Cutting tall grass at ground level
Operating trimmer at part throttle
Shafts are incorrectly assembled. Reassemble shafts. Refer to Joining the Power
Page 14 — English
SOLUTION
Use fresh fuel and the correct 2-cycle lubricant mix.
(50:1).
Clean air filter screen. Refer to Cleaning the Air Filter
earlier in this manual.
Contact a qualified service dealer.
Clean or replace spark plug. Reset spark plug gap.
Refer to Spark Plug Replacement earlier in this
manual.
Turn idle speed screw clockwise to increase idle
speed. See Figure 16.
Lubricate line with silicone spray.
Install more line. Refer to the applicable line replace-
ment section in this manual.
Pull lines while alternately pressing down on and
releasing bump knob.
Remove line from spool and rewind. Refer to the appli-
cable line replacement section in this manual.
Advance line at full throttle.
Clean threads and lubricate with grease - if no
improvement, replace the spool retainer.
Cut tall grass from the top down to prevent wrapping.
Operate trimmer at full throttle
Head to the Trimmer or Edger Attachment in the
Assembly section of this manual.