Bar And Chain Combinations - Black Max BM5020 Operator's Manual

Chain specifications: 0.325 pitch, .05 in. chain gauge
Length of Bar
20 in.
Problem
Engine will not start.
Engine starts but will
not accelerate prop-
erly.
Engine starts, then
dies.
Engine starts but will
not run properly at
high speed.
Engine does not reach
full speed and/or emits
excessive smoke.

BAR AND CHAIN COMBINATIONS

Guide Bar Part Number
312655005
TROUBLESHOOTING
Possible Cause
No spark.
Engine is flooded.
Carburetor requires "L"
(Low Jet)
adjustment.
Carburetor requires "L"
(Low Jet)
adjustment.
Carburetor requires "H"
(High Jet)
adjustment.
Lubricant/fuel
mixture incorrect.
Air filter is dirty.
Spark arrestor screen is
dirty.
Carburetor requires "H"
(High Jet)
adjustment.
Chain Part Number
Solution
Clean or replace spark plug. Reset spark plug gap. Refer to Spark
Plug Replacement earlier in this manual.
Remove spark plug. Move choke lever to RUN position (pushed
in completely) and pull starter cord 15 to 20 times. This will clear
excess fuel from engine. Clean and reinstall spark plug. Push and
fully release primer bulb 10 times. Pull starter grip and rope three
times with choke lever at RUN. If engine does not start, move choke
lever to FULL CHOKE and repeat normal starting procedure. If
engine still fails to start, repeat procedure with a new spark plug.
Contact an authorized service center for carburetor adjustment.
Contact an authorized service center for carburetor adjustment.
Contact an authorized service center for carburetor adjustment.
Use fresh fuel and the correct 2-cycle lubricant mix ratio.
Clean air filter. Refer to Cleaning the Air Filter in the Maintenance
section of this manual.
Clean spark arrestor screen. Refer to Inspecting/Cleaning the
Spark Arrestor Screen in the Maintenance section of this manual.
Contact an authorized service center for carburetor adjustment.
Page 37 — English
Drive Links
900920009 78 link