Gasoline Carburetor Adjustments (For most Onan CCKB carburetors)

Before adjusting the carburetor, be sure the ignition system is working
properly and the governor is adjusted. Allow the engine to warm up before
starting carburetor adjustments.

If carburetor is completely out of adjustment so the engine will not run, open
both valves 1 to 1-1/2 turns off their seats to permit starting. Do not force
the needle valves against their seats. This can bend the needle.

1. With no load, turn 'idle' adjustment out until engine speed drops slightly
   below normal. Then turn needle in until speed returns to normal.

2. Apply a full load to engine.

3. Carefully turn 'main' air mixture screw in until speed drops slightly below
   normal. Then turn screw out til speed returns to normal.

Alternate Method (No load adjustment possible)
1. Start engine and allow it to warm up.

2. Push in on governor mechanism to slow unit to 400 to 500 rpm.

3. Set idle adjustment screw for even operation (engine is running smoothly).

4. Release governor mechanism to allow engine to accelerate. If engine
   accelerates evenly and without a lag, the adjustment is correct. If not,
   turn needle out in 1/2 turns and repeat acceleration test. Continue until
   engine accelerates evenly and without any lag when governor is released.