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3.5.2 Engine will not Come Up to Idle Speed
Cause :
-Idle speed set too low
Solution:
-On the carburetor, screw the idle stop screw in
Cause:
-Idle speed set too high
Solution:
-On the carburetor, screw the idle stop screw out
Cause:
-Idle mixture set incorrectly
Solution:
-Turn the low speed adjuster so that correct idle is insured
Cause:
-Defective ignition
Solution:
-Ship engine to Göbler-Hirthmotoren or an authorized Hirth service center
3.5.3 Engine 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
3.5.4 Engine 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 carburetors, butterfly valve not fully open
Solution:
-Adjust butterfly valve accordingly
Cause:
-One of the two spark circle is defective
Abhilfe:
-Send engine to Göbler-Hirthmotoren or an authorized Hirth service center
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