21
P
ower
B
lower
o
Perator
'
s
M
anual
spark
plug
Level 1.
Parts Required:
Repower
TM
Tune Up Kit
IMPORTANT
Use only NGK BPM8Y spark plug (BPMR8Y in Canada) other-
wise severe engine damage may occur.
1. Remove spark plug , and check for fouling, worn and rounded
center electrode.
2. Clean the plug or replace with a new one. DO NOT sand blast to
clean. Remaining sand will damage engine.
3. Adjust spark plug gap by bending outer electrode.
4. Tighten spark plug to 150-170 kgf • cm (130-150 in • lbf).
CoolIng
sysTem
Level 2.
Parts Required:
None, if you are careful.
IMPORTANT
To maintain proper engine operating temperatures, cooling air must
pass freely through the cylinder fin area. This flow of air carries
combustion heat away from the engine.
Overheating and engine seizure can occur when:
• Air intakes are blocked, preventing cooling air from reaching the
cylinder.
• Dust and grass build up on the outside of the cylinder. This build up
insulates the engine and prevents the heat from leaving.
Removal of cooling passage blockages or cleaning of cooling fins is
considered “Normal Maintenance”. Any failure attributed to lack of
maintenance is not warranted.
Cleaning Grill
1. Remove accumulated debris from intake grill between backpack
frame and blower housing.
0.65 mm
(0.026 in.)
Summary of Contents for PB-500H
Page 30: ...30 notes...
