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Owner’s Manual
THT-210/210S/2000/2100/2120/2520, THT-240/2510/2530/2540/262
HTD-2520PF/2522PF/2526PF/2530PF, HTS-2530PF
Spark plug (Fig. 3-3)
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.
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.
Cutter blade (Fig. 3-4, 4B)
The blades are installed to the cutter guide with the four or
five bolts. Those bolts are tightened with a clearance so that
the cutters can move smoothly.
When clearance is too small:
The cutters do not move properly and the sliding surfaces
may seize.
When clearance is too large:
The cutters are poor in sharpness.
NOTE!
Properly lubricate the cutter sliding surfaces with machine oil.
To adjust the cutter clearance:
1. Loosen the cutter fixing nuts.
2. Fully tighten the cutter fixing bolts and then loosen them approx. 1/2 turn.
3. With the bolts set at that position, tighten the cutter fixing nuts.
Be sure to replace cutter guide fixing bolts when they are loosened, worn or damaged. Also be sure to replace damaged
cutter blade.
