Carburetor Removal; Carburetor Disassembly; Cleaning And Inspection; Carburetor Installation - Generac Power Systems GN190H Service And Repair Manual

SECTION 2: AIR CLEANERS AND CARBURETION

CARBURETOR REMOVAL:

A choke style carburetor will already be loosened from its mount
following step 5 in "AIR CLEANER BOX REMOVAL" on page 14.
For primer style carburetor, remove the two screws that hold
it to the intake manifold, being careful not to drop the lock
nuts and washers on the opposite ends of the screws (see
Figure 2.6).
The governor rod and lash spring must now be detached
from the throttle rod on either style of carburetor. Simply tilt
the carburetor until the rod and spring can slip out of the hole
on the lever.
SCREWS
GASKET
LOCK NUT
AND WASHER
Figure 2.6 — Removal of Primer Style Carburetor

CARBURETOR DISASSEMBLY:

See Figure 2.7. The carburetor can be disassembled
as follows:
1. Remove the BOWL NUT (Item 4) and the FIBER WASHER
(Item 5). Then, remove the FLOAT BOWL (Item 3).
2. Remove the FLOAT PIN (Item 7). Then, remove the FLOAT
(Item 2) and INLET VALVE (Item 8).
3. Remove the IDLE SPEED SCREW (Item 18) along with
SPRING (Item 17).
4. Rotate the THROTTLE VALVE (Item 14) to its closed posi-
tion and remove the SCREW (Item 13). The THROTTLE
VALVE can now be removed.
5. Remove the THROTTLE SHAFT (Item 15), along with the
THROTTLE SHAFT SPRING (Item 12) and the THROTTLE
SHAFT SEAL (Item 11).

CLEANING AND INSPECTION:

1. Separate out all nonmetallic parts. Then, clean metallic parts
with solvent or commercial carburetor cleaner. DO NOT
ALLOW NONMETALLIC PARTS TO CONTACT SOLVENT.
GOVERNOR ROD
AND ANTI-LASH SPRING
CARBURETOR
2. Inspect the THROTTLE SHAFT (Item 15) and THROTTLE
VALVE (Item 10). Replace if damaged.
3. Inspect the IDLE JET (Item 16). Check the passages as well
as its seating surface for damage. Replace if worn, dam-
aged or defective.
4. If so equipped, inspect the MAIN JET ADJUSTMENT. Replace,
if necessary.
NOTE: Later production carburetor may not be equipped
with a MAIN JET ADJUSTMENT:
5. The FLOAT BOWL (Item 3) must be free of dirt and corro-
sion. Use a new gasket when assembling the FLOAT BOWL.
NOTE: The float setting is FIXED and NONADJUSTABLE.
6. Replace the FLOAT (Item 3) if necessary.
7. After cleaning metal parts in cleaner, blow out all carbu-
retor passages with compressed air.
DO NOT ALLOW CARBURETOR METAL PARTS TO SOAK
FOR LONGER THAN 10 MINUTES OR THEY MAY BE
DAMAGED.
NEW STYLE, NONADJUSTABLE TYPE EMISSION
Generac recognizes that there are spray type car-
buretor cleaners on the market, however Generac
does not authorize the use of carburetor cleaners.
Also, Generac does not recommend soaking a car-
buretor in any cleaners since the carburetor might
be damaged.
NOTE: A MAIN JET TUBE is pressed into the carburetor
body to a measured depth. Do NOT attempt to remove
this tube. Tube movement will adversely affect carbu-
retor metering characteristics.

CARBURETOR INSTALLATION:

To reinstall a primer style carburetor, line up the mounting
holes on the carburetor with the holes on the intake mani-
fold and install the two screws. Then install the lock nuts and
washers onto the screws (see Figure 2.6).
To reinstall a choke type carburetor, see Step 1 under AIR
CLEANER BOX INSTALLATION on Page 15.
Refer to TORQUE SPECIFICATIONS on Page 59 for proper
tightness of carburetor and air box screws.
NOTE: Always use a new gasket when reinstalling the
carburetor and/or air cleaner box.
16
CARBURETOR