Section 3: Carburetion - Generac Power Systems GTV-990 Manual

SECTION CONTENTS
CARBURETOR TYPES ..................................................... 3-1
CARBURETOR REMOVAL................................................ 3-1
CLEANING CARBURETOR .............................................. 3-1
CARBURETOR INSTALLATION ........................................ 3-2
STATIC GOVERNOR ADJUSTMENT.................................. 3-2
FUEL PUMP .................................................................... 3-3
CARBURETOR TYPES
There are four types of carburetors used on Generac OHVI
V-twin engines:
1. Keihin two-barrel, side-draft on Models EVT-04198-0, EVT-
04629-0, EVT-04629-1, EVT-04630-0, EVT-04741-0,
EVT-04772-0, EVT-04797-0, 04807-0, 04861-0, 0D3358,
0E0038.
2. Deni two-barrel, side draft on Models EVT-04174-0, 04198-
1, 04629-2, 04806-0, 0E3342.
3. Nikki two-barrel, side-draft on Models EVT-04712-0, EVT-
04717-0, 04717-1, EVT-04739-0, 04857-0, 04858-0,
04862-0, 0D7675, 0D9033.
4. Nikki single-barrel, side-draft on Model 0D9708.
CARBURETOR REMOVAL - VERTICAL SHAFT
(Models EVT-04629-0, EVT-04629-1, 04629-2, EVT-04717-0,
04717-1, EVT-04797-0, 04806-0, 04857-0, 04858-0, 04862-0,
04861-0)
1. Unclip choke link from bellcrank and remove link from
carburetor.
2. Disconnect fuel-shutoff solenoid by unbolting the ground
wire from the manifold, and unplugging the power wire.
Note: Wires simply unplug from the solenoid on models
04629-2, EVT-04717-0, 04717-1, 04806-0, 04857-0, 04858-
0, & 04862-0.
3. Disconnect breather tube.
4. Separate throttle link balljoint from carburetor by rotating
the ball socket.
5. Disconnect the fuel line.
6. Remove the four nuts holding the carburetor and plenum
to the intake manifold.
7. Remove the plenum, carburetor, and gaskets from the
manifold, and discard the gaskets.
PAGE
For cleaning purposes, the carburetor's float bowl may be
removed. It is recommended that all jetting be left in place while
cleaning the carburetor. Be sure to use a cleaner that won't
damage rubber, neoprene, or plastic parts.
If the fuel-shutoff solenoid is suspected of being faulty, it is
replaceable by simply unthreading it from the float bowl, and
installing a new one in its place. It can be checked by apply-
ing 12 volts to it. If you hear it click, it is most likely working
properly. If there is anything else wrong with the carburetor,
it is recommended that the entire carburetor be replaced with
a new one.
3-1

SECTION 3: CARBURETION

Figure 3-1.
Figure 3-2.
CLEANING CARBURETOR