Cylinder Fins (Cooling System); Silencer; Replacement Guide Bar And Chain - Shindaiwa 451S Owner's/Operator's Manual

Cylinder fins (Cooling system)

1. Cylinder cover 2. Spark plug
5. Two bolts 6. Cushion
Check periodically.
Clogged fins will result in poor engine cooling.
Remove the air cleaner cover and the air filter, and the spark plug lead.
Remove the three bolts of the cylinder cover.
Loosen the two mounting bolts of the cleaner case.
Lift the cylinder cover up to the cushion of the cleaner case and pull it out.
Remove dirt and dust from between fins to let cooling air pass easily.
Assemble the components in reverse order.
Do not forget to fasten the two loose bolts of the cleaner case.

Silencer

NOTE
Carbon deposits in silencer will cause drop in engine output.
The spark arrester screen must be checked periodically.
1. Silencer 2. Front hand guard
Remove the clutch cover and pull the front hand guard backwards.
Remove the spark arrester screen bolt and pull out the screen from the silencer body.
Clean carbon deposits from the silencer components.
Replace the screen if it is cracked, or has holes burned through.
Assemble the components in reverse order.

Replacement guide bar and chain

IMPORTANT
Only use replacement bars and chains specified by the manufacture or the equivalent.
Otherwise, there may be a risk of accidents and damage to the machine.
Length cm Guide bar
Y33S21-56ML- SD
33
Y33S20-56ML- SD
Y38S21-64ML- SD
38 Y38R21-64AA- ST
Y38S20-64ML- SD
Y45S21-72ML- SD
45 Y45R21-72AA- ST
Y45S20-72ML- SD
Y50S21-80AL- SD
50 Y50R21-80AA- ST
Y50S20-80AL- SD
29
3. Three bolts
7. Cylinder fins
3. Bolt 4. Spark arrester screen
Chain Clutch drum (Part number)
21BPX-56E
95TXL-56E
21BPX-64E
95TXL-64E
(A556-000481)
21BPX-72E
95TXL-72E
21BPX-80E
95TXL-80E
4. Cleaner case