Primer Bulbs - Tecumseh SPECTRA 37 Service And Repair Manual

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These carburettors are float feed non-adjustable. Adjusting
screws for final setting of rpm can be found on the control
plate, if fitted. Screw A for high speed, screw B for low
speed (Fig 21). Screw C on the governor lever is left
hand thread, if cross head screw is fitted. (Fig 22).
If engine is fixed speed there will be no control plate, but
a deformable tag will be attached to the inlet manifold
screw. This tag can be adjusted for final setting of high
speed only.
Clean, fresh fuel is vital to the operation of any engine.
The device that meters the fuel to the engine is the
carburettor. If the fuel is stale, sour or contains water,
that creates a metering problem for the carburettor.
Good valves are essential for dependable starting. Burned
valves, poor seats or improper valve stem clearance result
in poor starting which is then incorrectly diagnosed as a
carburettor problem.
The proper float height is very important to all Tecumseh
carburettors and must be set by using the Tecumseh float
setting tool part number 670253A. (Fig 23) - Brass floats
only.
PRIMER BULBS (Figs 24 & 25)
These bulbs can be removed by grasping with pliers and
pulling and twisting out of the body. Remove the retainer
by prying and lifting out with a screwdriver.
Do not re-use old bulb or retainer. New primer bulb and
retainer come in a kit.
Insert new bulb in to primer well, fit new retainer over
bulb, press in with an appropriate sized socket.
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Fig. 20
Fig. 21
Fig. 22
OLD
Fig. 23
Fig. 24
48
Fig. 25