Table 3.3-1
The abbreviation "S" means single ignition and "D" represents dual igntion.
Number
Part
Order Number
Hours in service
2 Spark
plug
S
023.29
50
4 Spark
plug
D
023.28
50
2
Spark plug cap
024.22
100
4
Spark plug cap
024.22
100
2 Piston
set
014.78
1000
1 Crankshaft
271
BC
1000
2
Cylinder head S
322 A3 + 322 B2
1000
2
Cylinder head D
272 AW2 + 272 AW3 1000
2 Cylinder
272
AL1
1000
2 Carburetor
54/38/141
1000
2 Air
filter
066.16
100
3.4 Maintenance Procedures
3.4.1 Carburetor
The carburetors of Hirth engines are jetted in such a way by the manufacturer that
the engine
is guaranteed to run
thermally secure.
Since interference with the jetting of the carburetors
may lead to overheating, and thus to the destruction of the engine, such intereference must be
avoided. Only original replacement parts should be used. Data concerning carburetor
mounting can be obtained from Göbler-Hirth Engines. Give carburetor specifications, which
are marked at the solder joint of the carburetor intake.
3.4.1.1 Synchronization of Carburetors
In order to insure even performance and a smooth running engine, both carburetors have to be
synchronized precisely. Note that the idle adjustment screw holds the slide in the same
position on both carburetors. Measure and adjust the opening height on both carburetors for
this. The two cables which move the slide in the carburetor usually come together in a Y
fitting leading to a single throttle cable. The cables between the Y fitting and the carburetors
need to be adjusted so that there is some play in the cable at the idle position. This will insure
the proper idle position of the slides. When the throttle cable is pulled, the slides of the
carburetors should move upward simultaneously from the idle position. Lubricate cables if
difficult to operate. Defective or frayed cables have to be exchanged for new ones
immediately. Bent cable must be changed immediately.
3.4.1.2 Setting the Fuel Mixture Adjustment Screw
In both carburetors, the idle mixture adjustment screw is opened half a turn as its normal
setting. For this, first carefully turn the screw to closed position, then open it one half turn.
