GH F33 BDA
3.4.3 Fuel and Pulse Lines
3.4.3.1 Inspection of Fuel Lines
Check the fuel line between the fuel diaphragm pump, carburettor and fuel tank for leakings
and/ or damages. Leaking and/or damaged fuel lines have to removed immediately.
3.4.3.2 pulse line check
Check pulse line between the negative-pressure nipple at crankcase and the pulse connection
of the fuel diaphragm pump for leakings and / or damages. Leaking and/or damaged pulse
lines have to removed immediately.
3.4.4 Spark Plugs and plug sockets
3.4.4.1 condition check of the Spark Plug
Check spark plug connector an in-lying contact spacer for corrosion by drawing off spark
plug connector. Check the SAE contact (the small screw-on cap) at top of spark plug for
corrosion. In case corrosion is present, replace spark plug connector and SAE-contact of spark
plug (generally spark plug is changed completely - see next paragraph)
3.4.4.2 installation and deinstallation of spark plug
For deinstallation remove spark plug connector. Untie and screw off spark plug with spark
plug wrench.
Before installation of the new or still useable spark plug, check in every case, electrode
distance (0.6 mm) through feeler and if need adjust.
Tie spark plug through spark plug wrench, and torque wrench with mentioned torque on the
cylinder head.
3.4.4.3 Condition of the spark Plug
Spark plugs should show dry, light-brown shade on middle electrode, the isolator of the
middle electrode and on groundside case. If shade goes to light and very dry grey than engine
runs hot and mixture is too thin. If shade goes wet dark brown to black, the engine runs with a
fat mixture. In both cases contact the supplier or Göbler Hirthmotoren.
Check spark plug middle electrode and ground-bow for wear (burn down). In case of burn
down change spark plug immediately. Please do not clean spark plug with rough materials
(emery paper, brass brush,…)
3.4.5 Cylinder head
The cylinder head consists of a special aluminium alloy which allows temperature of 280° C.
In case of overheating (ca. 300° C) the material losses hardness. Loss of hardness leads to
leakness of sealing surface between cylinder and cylinder head. Tighten up the cylinder head
screw is without effect. Cylinder head has to be renewed.
Stand: 02.02.05 DOC_F33_B_E_0.01
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