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http://www.ultralightnews.ca/ Page 24 of 31
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wheels, insert the part of the belt that is outside into the other slit in the fan housing and then remount the
metal guard.
9Cylinder head
The cylinder heads are manufactured from a special aluminium alloy which permits a maximum temperatures
of 280C. If the metal is overheated (ca. 300° C), the material looses hardness. This loss in hardness leads to
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leakages in the seal surface between the cylinder head and the cylinder. Tightening the cylinder head screws
will have no effect. The cylinder head must be replaced.
9.1Cylinder head removal and installation
To remove the cylinder head, remove the spark plug caps, the spark plugs, and the fan housing, as described
above. Loosen and unscrew the eight cylinder head screws with a hexagonal socket wrench. Mark the
position and placement of the cylinder heads, then remove cylinder heads. To install the cylinder heads,
reverse the process, tightening the cylinder head screws lightly and first, then applying the prescribed torque
values using crossway technique.
9.2Checking the condition of the cylinder head
Check the seal of cylinder heads and cylinders for places on which exhaust gas has blown through. These
places can be recognized by black lines over the seal and burned residue on the cooling fins. If this is the
case, the cylinder head must be immediately replaced. Check the indentation on the cylinder head for the
black residue. If present, remove it and eventually change the type of oil used.
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