MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any seasonal
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to any
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any
WARNING: To prevent serious injury, never perform
maintenance or repairs with unit running. Always service and repair a cool unit. Disconnect the spark plug wire to ensure that the unit cannot start.
FREQUENCY | MAINTENANCE REQUIRED | REFER TO | |
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Before starting engine | Fill fuel tank with fresh fuel | Page 12 | |
Check oil | Page 16 | ||
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Every 10 hours | Clean and | Page 17 | |
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First change at 10 hours | Change oil | Page 16 | |
Every 25 hours thereafter | Change oil | Page 16 | |
Every 25 hours | Clean spark arrestor | Page 20 | |
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10 hours on new engine | Check rocker arm to valve clearance and adjust | Page 18 | |
Every 25 hours | Check rocker arm to valve clearance and adjust | Page 18 | |
Every 25 hours | Check spark plug condition and gap | Page 20 | |
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SPEEDSPOOL® (TB425CS & TB475SS)
WARNING: Never use metal- reinforced line, wire,
chain or rope. These can break off and become dangerous projectiles.
LINE INSTALLATION
Always use original equipment manufacturer 0.095 inch (2.41 mm) replacement line. Lines other than those specified may make the engine overheat or fail.
There are two methods to replace the SpeedSpool® trimming line:
•Wind the inner reel with new line
•Install a
Winding the Inner Reel With New Line
Top View Of The SpeedSpool®
Arrows
Outer Spool
Inner Reel 
Bump Knob
Fig. 41
NOTE: It Is unnecessary to remove the bump knob to install a new trimming line.
1.Cut two pieces of 0.095 inch (2.41 mm) trimming line, 10 feet (3 m) long.
2.Hold the outer spool and turn the inner reel counterclockwise to line up the arrows on the outer spool and inner reel (Fig. 41).
3.Pull old line out of the line loading and line locking holes (Fig. 42 and 43).
4.Insert a piece of trimming line straight into one of the two eyelets in the outer spool. Push it up through the line loading hole in the inner reel (Fig. 42). Do not bend the line when inserting it into the eyelet.
WARNING: Always use the correct line length
when installing trimming line on the unit. The line may not release properly if the line is too long.
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