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Owner’s Manual
THB-2500/THB-2510/TBL-4600/4610
,
TBL-505
NOTE!
In some areas, local law requires using a resistor spark plug to suppress ignition signals. If this machine was originally
equipped with resistor spark plug, use same type of spark plug for replacement.
Muffler (Fig. 3-5, 5B,5C)
Remove the muffler and clean out any excess carbon from the exhaust port or muffler inlet every 100 hours of
operation.
Spark plug (Fig. 3-4)
The spark plug condition is influenced by:
• An incorrect carburetor setting.
• Wrong fuel mixture (too much oil in the gasoline)
• A dirty air filter.
• Hard running conditions (such as cold weather).
These factors cause deposits on the spark plug electrodes, which may result in malfunction and starting difficulties. If
the engine is low on power, difficult to start or runs poorly at idling speed, always check the spark plug first. If the
spark plug is dirty, clean it and check the electrode gap. Readjust if necessary. The correct gap is 0.6 mm (.024”). The
spark plug should be replaced after about 100 operation hours or earlier if the electrodes are badly eroded.
Cylinder (Engine cooling) (Fig. 3-6, 6B)
The engine is air cooled, and air must circulate freely around engine and over cooling fins on cylinder head to prevent
overheating.
Every 100 Operating hours, or once a year (more often if conditions require), clean fins and external surfaces of engine
of dust, dirt and oil deposits which can contribute to improper cooling.
NOTE!
Do not operate engine with engine shroud or muffler guard removed as this will cause overheating and engine damage.
Spark arrestor
If your unit comes with spark arrestor screen and yet your local regulation requires use of spark arrestor for prevention
against a possible fire, please attach it to the muffler by removing muffler protector and other related parts.
(The spark arrestor meets the regulation of SAE J335-SEP90 and CSA CAN3-Z62. 1 -M77)