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http://www.ultralightnews.ca/hirth-engines.htm Page 26 of 31
The Ultralight News
10.4Engine Does Not Develop Full Power
Cause: Dirty air filter
Solution: Clean or replace filter
Cause: Dirty fuel filter
Solution: Clean or replace the fuel filter
Cause: Fuel mixture has too much oil in the gasoline
Solution: Empty tank and fill with fuel of the proper mixture
Cause: Incorrect adjustment of carburettors, butterfly valve not fully open
Solution: Adjust butterfly valve accordingly
Cause: One of the two E-Box circuitry is defective
Solution: Send engine to Göbler-Hirthmotoren or an authorized Hirth service centre
Cause: Defective piston, piston ring, cylinder head, or cylinder
Solution: Send engine to Göbler-Hirthmotoren or an authorized Hirth service centre
Cause: Incorrect timing
Solution: Adjust the timing; contact your Hirth service centre for the correct procedure
10.5Excessive Cylinder Head Temperature
Cause: Fan belt too loose or defective
Solution: Tighten fan belt or replace
Cause: Defective fan
Solution: Replace the fan
Cause: Defective shroud
Solution: Replace shroud
Cause: Insufficient cool air reaching the blower Solution: -Install blower so that fresh air gets to
the blower unhindered
Cause: Dirty carburettor
Solution: Clean carburettor
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