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http://www.ultralightnews.ca/ Page 32 of 39
The Ultralight Store - your one stop ultralight store.
11Trouble Shooting (general)
11.1Engine Does Not Start or is Difficult to Start
Cause: Lack of fuel
Solution: Insure fuel switch is on
Insure fuel filter is clean
Insure that fuel is in the tank
Cause: Defective or discharged battery
Solution: Replace battery
Charge the battery
Cause: Lack of compression on one or both cylinders, due to a loose spark plug or a defective
piston, piston ring, cylinder head, or cylinder:
Solution: Tighten spark plug to prescribed torque, or ship engine to the manufacturer or an
authorized Hirth service centre
Cause: - No spark or weak spark due to defective spark plug, spark plug cap, or a defective ignition
Solution: Replace spark plug, spark plug cap, or have the manufacturer or an authorized Hirth
service centre replace the defective ignition
11.2Engine Runs Rough, Uneven, and with Insufficient Power
Cause: Dirty air filter
Solution: Clean or replace air filter
Cause: Dirty or defective spark plugs
Solution: Clean or replace the spark plugs
Cause: Dirty fuel filter
Solution: Clean or replace fuel filter
Cause: Fuel mixture has too much oil in the gasoline
Solution: Empty tank and fill with fuel of the proper mix
Cause: Defective sparkplug caps
Solution: Replace the spark plug caps
11.3Excessive 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
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