Tanaka TBC-420PF, Service Manual

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To maintain carburetor performance, it is recommended that
C.
rubber parts be inspected periodically or whenever disassembled.
Check diaphragm for deterioration or damage, valve hinge for
deformation and needle valve for wear.
Always use fresh fuel. Fuel which has been stored for an extended
periods of time will damage carburetor parts and decrease
performance.
Carburetor performance us effected slightly by weather, altitude,
break-in, etc. But it is generally not necessary to adjust the
carburetor.
If carburetor floods, check the needle valve for wear. Also check
valve hinge adjustment and carburetor adjustment
(see section A and B).
4)
Carburetor Insulator
If the engine will not run smoothly after checking and adjusting the
carburetor, check insulator. Fig 23
A.
Check alignment for pulse hole of insulator, inlet manifold gasket
and cylinder. Check for any damage and replace as needed.
B.
Check flat surface of insulator where the cylinder and carburetor
are installed. If uneven, make flat by using fine sandpaper or
replace as needed.
NOTE: When assembling insulator on the unit, always replace inlet
manifold and carburetor gasket.
6-4
Disassembling and Assembling Engine
1)
To separate engine side and drive side, disassemble at fan
case or clutch case from drive shaft pipe and also disconnect
stop cords and throttle wire.
2)
Remove magneto rotor tightening nut and remove magneto rotor
from the crankshaft by using the following special tools. Fig 24
1. Fly-Wheel Remover
2. Center Bolt
3. Step Bolts or Remover Bolts
4. Handle Bar 8 X 120
(See section 1. Special Tools List)
NOTE: Make sure not to damage the end of the crankshaft,
when removing the magneto rotor.
3)
After removing the muffler bolts, remove muffler
and muffler gasket.
NOTE: Inspect muffler for carbon build-up and
clean or replace as necessary. Fig. 25
4)
When installing clutch assy onto the unit, make sure of the
direction of the clutch. Fig. 25-1
NOTE: Check for any wear or damage before installation
of clutch and replace as necessary.
NOTE: If clutch assy is installed in reverse
on the unit, you will not get smooth
engagement at low rpm.
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