AIR INTAKE SYSTEM
35
NOTE: The carburetors are not inter-changeable from one
engine model to another. To help prevent carbure-
tor mix-ups, the Carburetor Calibration Number is
stamped on the carburetor by the fuel nipple. Cali-
bration numbers are similar or the same as the
engine number. See Figure 3.11.
NOTE: MTD gets carburetors from several suppliers.
When ordering carburetor kits, the carburetor’s
manufacturer, calibration code and serial number
are needed. All of this information is located on the
carburetor. See Figure 3.12.
3. The insulator is sandwiched between two gaskets
which are located between the carburetor and the
cylinder head. See Figure 3.13.
NOTE: The gaskets are different, and there is an orienta-
tion to the insulator.
NOTE: The front gasket also acts as a heat shield.
4. Install the insulator by following the above steps in
reverse order.
NOTE: Tighten the carburetor mounting nuts to a torque of
80 - 106 in lbs (9 - 12 Nm).
5. Test run the engine before returning to service.
Figure 3.11
Carburetor Calibration Number
Figure 3.12
Suppler trademark
Alphanumeric code
Calibration code
Serial code
Figure 3.13
Gasket: insulator
to cylinder head
Gasket: Insulator
to carburetor
Insulator
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