Spark Plug; Cooling Systems Cleaning - Echo PB-751H Operator's Manual

20

SPARK PLUG

Level 1.
Tools required: 19mm Spark Plug deep socket, Feeler gauge
Parts Required: Repower
IMPORTANT
Use only NGK BPM-8Y spark plug (BPMR-8Y in Canada)
otherwise 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 kg/cm (130-150 in. lb.).

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 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.
Cleaning Cylinder Fins
1. Remove spark plug and engine cover (four screws), pull cover
away from engine.
2. Clean cylinder fins (A) to allow cooling air to pass freely.
3. Install engine cover and spark plug.
TM Tune Up Kit P/N 90071
0.65 mm
(0.026 in.)
A