Generac Power Systems MC User Manual

Page 34

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A.)-Turn High Speed Jet Adjusting

Screw clockwise until it just bot

toms. DO NOT USE EXCESSIVE FORCE.

Then turn High Speed Jet Adjusting

Screw counterclockwise about

turns. Perform the same initial ad

justment on the Idle Mixture Adjust

ment Screw. This initial adjustment

should permit the engine to be star
ted and warmed up.

Automatic Choke

Throttle Lever

Idle Mixture

Adjusting Screw

. High Speed Jet

Adjusting Screw

RESULTS:- Engine starts............................. Go to Paragraph B

Engine will not start......... ..... ...... Go to Paragraph D

B. )- Set VOM to "250V,” scale and to "AC". Connect the meter test leads

to a convenient AC outlet powered by the alternator. Hold the Carburet
or Throttle Lever against its Idle Speed Stop Screw, Adjust Idle Speed

Stop Screw until meter indicates 60 Volts a-c. When a 60 Volt reading

is obtained, turn Idle Mixture Adjusting Screw until voltage starts to
drop off. Then turn the screw in the opposite direction until voltage
reading again starts to decrease. Finally, reverse direction again and
turn the screw until the highest voltage reading is obtained. Release

Throttle Lever and let engine accelerate and stabilize,

C. )- With engine running at governed speed, apply a normal load to the
alternator. Connect an accurate frequency meter to the unit’s a-c out
put, Turn the High Speed Jet Adjusting' screw slowly clockwise then
counterclockwise until the highest frequency is obtained. When the Jet
is set for the highest possible frequency, turn adjusting screw count

erclockwise 1/8 turn.

RESULTS:- Engine starts and runs normally............Discontinue Tests

Engine will not start or starts and runs
rough....................... .............. Go to Paragraph D

D.)- Remove Fuel Bowl from Carbur
etor Body. Inspect Float Valve,
Seat and Gasket for damage, dirt
or wear. Replace defective compon
ents. Also check for proper Float
setting. Top of Float should be
0.070 - 0.110 inch below Carburet
or Body mounting Flange. See illu
stration at right.

2.2-12