Onan MJA Series Service Manual page 38

36 FUE L SYSTEM
1. With no load on the generator, turn the idle adjustment out until the
engine speed drops slightly be low normal. Then turn the needle in
until speed returns to normal.
2. Apply a full load to the generator.
3. Carefully turn the main adjustment
in
until speed drops slightly
below normal_ Then turn the needle out until speed returns to
normal_
ALTERNATE J\1ETHOD. USE WHEN THERE IS NO LOADADJUST:MENT
POSSIBLE
+'\
1. Start the plant and allow it to warm up.
2. Push in on the go\'ernor mechanism to slow the plant down to about
400 - 500 rpm.
:3. Set the idle adjustment screw for even operation (so the engine is
firing on all cylinders and running smoothly).
4. Release the governor mechanism to allow the engine to accelerate.
If the en~ine accelerates e\'enly and without a lag. the main adjust­
ment is correct. If·not. adjust the needle outward about 1/2 turn
and again slow down the engine and release the mechanism. Con­
tinue until the engine accelerates evenly and without a time lag
after releasing the go\'ernor.
With the carburetor and governor adjusted set the throttle stop screw.
Fig 3.2. J. to allow 1/32 in. clearance to the stop pin with the plant
operating at no load. This pre\'ents excessive hunting when a large load
is suddenly remo\'ed.
3.2.5.2 Remo\'al and Disassembly. ­
1. Remm'e the fuel line. gO\'ernor linkage and electric choke wire.
2. Remove the 2 carburetor mounting nuts and pull off the carburetor .
3. Re move the air silencer adapter from the carburetor.
c'
4. Remo\'e the 2 scre-v.'s that mount the choke heating coil to the car ­
buretor and pull off the coil assembly_
5. Remove the float bowl nut and pull off the bowl.
6. Remove the float pin and float.
7. Lift out the float valve and unscrew its seat.