Download spec A-C

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RBURETOR
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GOVERNORCONTROL LINKAGE
FS-1607
FIGURE 6-13. CARBURETOR & INTAKE MANIFOLD ASSEMBLY
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Assembly: Reverse order of disassembly. Use new
gaskets between intake manifold and engine and
between intake manifold and carburetor. Do not use
any sealer on gaskets. Tighten intake manifold capscrews to specified torque.
Carburetor Mixture Screw Adjustments
The most common cause of poor carburetion is unsatisfactory adjustment of the idle or main mixture
adjustment screws. Significant variation from the
correct settings may result in serious engine trouble.
An overly rich mixture not only wastes fuel, but can
increase engine wear by washing the lubricant from
the cylinder walls and diluting the crankcase oil. An
overly lean mixture results in a loss of power, flat
spots in acceleration,and a greater tendency to burn
valves and spark plugs. '
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Forcfng the mixture adjustment
screws ffght wflf damage the needle
and seat. Turn In only until lfght tendon can be felt.
Start the engine and allow it to run for about 10 minutes. The location of the adjustment screws is shown
in Figure6-14. Use thefollowing procedure toadjust:
IDLE
ADJUSTMENT
CARBURETOR
FUEL MIXTURE
ADJUSTMENTS
Mixture screw adjustment should be checked with
c
. every enginetune-up and whenever a carburetionprob-
lem is suspected. Before adjusting, be sure the ignition
system is working properlyandthe governor is correctly
set If the carburetor is totally out of adjustment, usethe
mixture settings given in Table 6-2 as preliminary
adjustments. Turn the mixture screws in until lightly
seated, then turn out the specified number of turns.
MAIN
ADJUSTMENT
SCREW
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FS-1608
Redistribution
or ADJUSTMENT
publication of this document,
FIGURE 6-14. MIXTURE
SCREW
by any means, is strictly prohibited.