17
P
OWER
B
LOWER
O
PERATOR
'
S
M
ANUAL
SPARK
PLUG
Level 2.
Tools required:
3/4 in. Spark Plug deep socket, Feeler gauge
Parts Required:
Tune Up Kit P/N 90071
1.
Remove spark plug cover and spark plug, 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 145-155 kg/cm (125-135 in. lb.).
5.
Install spark plug cover.
IMPORTANT
Always reinstall spark plug cover, otherwise engine cooling will
be greatly reduced, and engine failure will result.
COOLING
SYSTEMS
CLEANING
Level 2.
Tools required:
25 - 50mm (1 - 2 in.) cleaning brush, cross head
screwdriver
Parts Required:
None, if you are careful.
IMPORTANT
To maintain proper engine operating temperatures, cooling air
mustpass freely through the cylinder fin area. This flow of air
carriescombustion 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.
INTAKE
GRILL
0.65 mm
(0.026 in.)
