Cleaning Cooling Air Passage; Checking Muffler And Exhaust Port Of Cylinder - Bosch PB-650 Service Manual

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8-2 Cleaning cooling air passage

8-3 Checking muffler and exhaust port of cylinder

ENGINE
1. Remove spark plug and engine cover.
2. Inspect cylinder cooling fins for blockage with dirt
or dust.
Always wear eye protection when using com-
pressed air. Eye damage can occur from
flying particles.
3. Clean the air passages with a wooden or plastic
stick, or compressed air as required.
1. Remove muffler.
2. Inspect the cylinder exhaust port and clean the
port using a wooden or plastic stick if carbon is
deposited.
NOTE: When cleaning the port, always position the
piston at Top Dead Center (TDC) to prevent carbon
from entering cylinder. Do not use a metal tool and
be careful not to scratch piston or cylinder.
3. Remove carbon deposits from muffler component
parts. If heavily deposited, replace with new parts
as required.
4. Reinstall all the removed parts in place.
PB-650
PB-750
WARNING