Onan MJA Series Service Manual page 34

32.
. FUE L SYSTEM
A\'ERAGE CHO:KE SETTINGS
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CHOKE OPE.N1NG
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84
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CHOKE PlAn
LOOSEN THESE
SCREWS AND
ROTATE THE
ENTIRE COVER
ASSEMBLY
FIG 3.2.E - ADJUSTING AUTOMATIC CHOKE
4. Insert the valve cages, gaskets and valve cover plate. Position.
the inlet valve with spring showing and the outlet valve with spring
in the cover recess. .
5. Assemble the cover to the body with notch marks lined up. Install
the screws but don't tighten.
6. Push the rocker arm in full stroke and hold in this position to flex
the diaphragm. NOTE: The diaphragm must be flexed or it will
deliver too much fuel pressure.
7. Tighten the cover screws alternately and securely, then. release
the rocker arm.
8. Install the pump on the engine and repeat the pressure test, Sect
3.2.3.1.
3.2.4 CHOKE (Gasoline Fuel System)
Remote starting models of generating plants use an automatic electric
choke, Fig 3.2.A. An electric element controls the automatic electric
choke. Before the plant starts, the choke is closed. When the plant
has started, the generator supplies currerit to the heating element which
heats the choke's bi-metal coil. As this coil heats, it winds tighter,
opening the choke plate.
3.2.4.
l'
Adjustment, Electric Choke. - Under normal operation, adjust
the choke so the distance measured between the choke plate and carbu­
retor throat, Fig 3.2.E, is as shown in the table with the engine cold.
Use the straight shank end of a drill bit to measure the gap. The up ­
turned air cleaner must be removed for choke adjustment. To adjust
the choke, loosen the 2 screws on the e.ndplate and rotate the cover
assembly.