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http://www.ultralightnews.ca/hirth-engines.htm Page 12 of 31
The Ultralight News
CHT temperatures in excess of 280°C or 536°F are a result of :
Lack of oil in fuel or NO oil in the fuel.
Poor piston cylinder lubrication, due to poor quality of oil.
The use of a fan belt other than that supplied by Hirth, a loose, or damaged fan belt.
Ablocked fan intake duct, or blocked cylinder head fins. (Insect nesting, mice etc.).
Insufficient cooling due to air intake design.
Pre-ignition or detonation, caused by old fuel, improper octane, ignition timing.
Figure 3.1.2 Installation wiring diagram
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