Usage:
All Spark-Ignited Engines
- SUPPLEMENT: 03/25/91
Service Magazine; February 11, 1991; Page 10; "New Sleeve-Type Bearings Give Better Carburetor And Governor Control". In the second chart, the first part number listed under "New Part No." reading "9Y5303" is incorrect. It should read 9Y5301.
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Description of Change: New bearings are used on the throttle shafts in the carburetors on all spark-ignited engines. The new bearings are sleeve-type bronze bearings that are impregnated with Teflon®. These bearings have less friction than the former sleeve-type bearings. The reduction in friction gives more stable governor control and longer carburetor life.
Adaptable To: See the applicable topic for adaptability to the various engine models.
3304, 3306 Spark-Ignited Engines
To get the new bearings, install either the new carburetor assembly, or the new throttle assembly which includes the bearings and throttle body. The new bearings in the new bearing kit cannot be installed in place of the former bearings on the former throttle assembly.
G342C (71B454-Up), G379A (72B1509-Up), G398A (73B2135-Up), G399 (49C1548-Up) Engines
To get the new bearings, install either the new carburetor assembly, or the new throttle assembly which includes the bearings and throttle body. The new bearings in the new bearing kit cannot be installed in place of the former bearings on the former throttle assembly.
G399 Engines (49C1548-Up)
There are three ways to get the new bearings.
...Install the new carburetor assembly.
...Install the new throttle assembly.
...Install the new bearings in the new, parts service 7C4998 Bearing Kit in place of the former bearings on the former throttle assembly.
The new 9Y5309 Bearing Kit services only the new carburetor assemblies or the new throttle assembly.
3408 (6NB571-Up), 3412 (7DB355-Up) Spark-Ignited Engines
There are three ways to get the new bearings.
...Install the new carburetor assembly.
...Install the new throttle assembly.
...Install the new bearings in the new, parts service 7C4998 Bearing Kit in place of the former bearings on the former throttle assembly.
3512 Spark-Ignited Engines (4KC98-Up)
There are three ways to get the new bearings.
...Install the new carburetor assembly.
...Install the new throttle assembly.
...Install the new bearings in the new, parts service 7C4998 Bearing Kit in place of the former bearings on the former throttle assembly.
The new 7E1552 Bearing Kit services only the new carburetor group or the new throttle assembly.
3516 Spark-Ignited Engines (3RC119-Up)
There are three ways to get the new bearings.
...Install the new carburetor assembly.
...Install the new throttle assembly.
...Install the new bearings in the new, parts service 7E1556 Bearing Kit in place of the former bearings on the former throttle assembly.
The new 7E1559 Bearing Kit services only the new carburetor group or the new throttle assembly.
