Alternative Style Primer Start Float Carburetors; Primer Bulbs/ Main Jet/Bowl Nut; New Float (Height Adjustment) - Tecumseh SPECTRA 37 Service And Repair Manual

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d) ALTERNATIVE STYLE PRIMER START FLOAT
CARBURETTORS (Fig. 26)
With the advent of more stringent emission controls,
carburettor technology is continually improving. Be aware
that there are now many different types of Primer
Carburettors, which at first glance may seem similar.
Always refer to the master spare parts listing, using the
correct engine model, spec and serial number when
ordering spare parts.
PRIMER BULBS
There are different types of primer bulb fitted to float style,
primer start carburettors.
Stepped bulb with vent
Stepped bulb without vent
Smooth bulb with vent
Smooth bulb without vent, etc.
Using the wrong primer bulb during repair will cause poor
engine running and bad starting.
MAIN JET / BOWL NUT
Due to the different styles of primer carburettor, there
are different types of Bowl Nut / Main Jet used. These jet
types are not interchangeable.
NOTE - Always refer to the master spare parts list,
using the correct engine model and specification
numbers when ordering spare parts.
e)

NEW FLOAT (Height Adjustment)

The float height adjustment dimension indicated in Fig.
16 and in Fig. 23 was used on earlier carburettor models.
Float height adjustment for new carburettor models
requires use of a 11/16" (4.5 mm) insert.
Proceed as follows: Invert the carburettor with the float
upwards. Position the insert on the carburettor body
parallel to the fastening plug.
Adjust float height by letting it rest against the insert and
bending the rear tab (See Fig. 27).
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Fig. 26
Fig. 27
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