Specifications

67
Primer Bulb Identification
Caution must be used when replacing carburetor primer bulbs. Using the wrong primer bulb could cause
hard starting and operating problems. Currently, Tecumseh uses five different carburetor mounted bulbs.
To avoid problems, use the Master Parts Manual for the correct application.
The primer bulbs offered feature two different shapes; derby and stepped (or hourglass).
Sealing Surface
INTERNALLY
VENTED
INTERNALLY
VENTED
The stepped primer bulb is used to force a charge of air
into the bowl through the atmospheric vent chamber. The
sealing surface (as pictured), prevents air from going back
into the air filter while priming.
EXTERNALLY
VENTED
EXTERNALLY
VENTED
Foam element on
externally vented bulbs
are to prevent dirt
ingestion.
DERBY STYLE
STEPPED