22 
cooling system
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 com-
bustion 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.
A