hecht 9254 - Fuel System; Replacement of Fuel Filter

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For good performance, the spark plug must be properly gapped and free of deposits.
1. Disconnect the cap from the spark plug and remove any dirt from the spark plug area.
(fig. 13A)
2. Use the proper size spark plug wrench to remove the spark plug.
3. Inspect the spark plug. Replace it if damaged, badly fouled, if the sealing washer is in poor
condition, or if the electrode is worn.
4. Measure the electrode gap with a suitable gauge. The correct gap is listed in the Specifications.
If adjustment is needed, correct the gap by carefully bending the side electrode. (fig. 22A)
5. Install the spark plug carefully, by hand, to avoid cross-threading.
6. After the spark plug is seated, tighten with the proper size spark plug wrench to compress
the washer.
7. When installing a new spark plug, tighten by 1/2 turn after the spark plug seats to compress
the washer.
8. When reinstalling the original spark plug, tighten by 1/8 - 1/4 turn after the spark plug seats
to compress the washer.
9. Attach the spark plug cap to the spark plug.
Note: I Over tightening the spark plug can damage the threads in the cylinder head.
MUFFLER
Allow the engine and exhaust to cool before handling.
• Remove accumulated debris from muffler area and cylinder area.
• Make sure the muffler is without cracks, corrosion or other damage.
• If the exhaust system is fitted with a spark arrester, it must be kept clean and
passive. After removing the arrester and knocking out the coarse dirt, clean
the arrester with a fine brush (e.g. toothbrush) from all deposits. After cleaning,
reassemble it.
CARBON SEDIMENTS
It is recommended to remove carbon sediments from cylinder, piston upper side and valves
surrounding each 100 – 300 operating hours in authorised service center.
FUEL SYSTEM
CAUTION! A
Spare parts of fuel system (plugs, hoses, tanks, filters etc.) must be the same as
original otherwise arises danger of fire.
• Regularly check the condition of fuel hoses.
• Replace the fuel hose every 2 years. If fuel leaks from fuel hose, replace the fuel hose
immediately.
REPLACEMENT O F FUEL FILTER
Do not use the machine without fuel filter in any case. Replace fuel filter regularly.
1. Drain off the fuel from the tank to suitable container in the well ventilated place.
2. Draw out the fuel pipe from the tank by wire hook and remove it by turning.
3. Replace the fuel filter and fitted fuel pipe get back into the fuel tank. (fig. 23A)