Briggs & Stratton 950 Series Operating and installation instructions

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Copyright © Briggs & Stratton Corporation Page 1 of 13
All language translations of this document are
derived from the original English source file.
ADVANCE PRODUCT SERVICE INFORMATION
APSI NO: 101
DATE: AUGUST 2014
SUBJECT: 950 SERIES™ UTILITY ENGINE
MODELS: 130G00 OHV HORIZONTAL SHAFT
This APSI provides basic servicing information in advance of the repair manual under development. Systems
testing, troubleshooting, and component removal and installation procedures are common with most other
single-cylinder horizontal-shaft OHV engines. See the Illustrated Parts List for service part numbers. The
specifications, part numbers, and procedures provided here are preliminary and subject to change.
MODEL IDENTIFICATION LOCATION
The Model-Type-Trim and Code numbers (A) are printed or etched into the edge of the cylinder base below
the fuel tank. The bar code serial number label (B) is attached to the side of the fuel tank.
A
B

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OVERALL ENGINE DIMENSIONS (Millimeters)

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GOVERNOR SHAFT INSTALLATION
There is a washer (A) that must be fitted to the governor shaft before installation into the cylinder. Secure the
governor shaft from the outside with the retaining clip. The straight leg of the clip fits into the groove (B) of
the governor shaft.
OPTIONAL LOW-OIL SENSOR INSTALLATION
The low-oil sensor installs inside the cylinder with two screws (C). Tighten the screws to 60 lb-in (6.8 Nm).
Next, route the sensor harness (D) through the opening in the cylinder. Secure the harness from the outside
with the hex nut and tighten to 40 lb-in (4.5 Nm). Also see Low-Oil Module Installation.
PISTON ASSEMBLY
When installing the oil ring expander, ensure that the ends at the expander gap (E) point up toward the piston
crown. The lettering on the center and top piston rings must also face up toward the crown. When installing
the piston assembly into the bore, the notch in the piston (F) and the oil dipper on the connecting rod (G) will
face down toward the push rods.
C
B
A
D
E

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CRANKCASE COVER INSTALLATION
1) Make sure the mating surfaces on the cover and the cylinder are clean and dry.
2) Install the new gasket over the dowel pins, then carefully install the cover over the crankshaft and
press into place.
3) Start the cover screws by hand and then step-torque in the sequence shown below to 220 lb-in (24.9
Nm).
F
G
1
2
3
4
5
6

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CYLINDER HEAD ASSEMBLY AND INSTALLATION
1) Install the valves, then turn the head over to install the stem seal on the intake valve. Note that the
flat end of the seal faces the head.
2) Install the valve springs and retainers.
3) Position the head plate (H) with tangs facing down (inset). Install the two studs (I) and tighten them to
125 lb-in (14.1 Nm).
4) Place the head gasket on the cylinder. Ensure the breather hole in the gasket aligns with the
breather hole in the cylinder.
5) Install the head assembly to the cylinder with four screws. Tighten the screws to 210 lb-in ( 23.7 Nm)
in the sequence shown.
6) Install the push rods and the valve stem caps.
7) Install the rocker arms and the rocker ball nuts. After setting the valve clearance (see Common
Specifications chart below), tighten the rocker ball nuts to 70 lb-in (7.9 Nm).
8) Place the cover gasket inside the valve cover and fit the cover over the cylinder head. Install four
screws and tighten to 80 lb-in (9.0 Nm) in the same sequence as the head screws.
H
I
1
2
3
4

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STATOR INSTALLATION
If the engine is equipped with a stator assembly, install it as follows:
1) Position the stator with the wires to the top and facing the cylinder. Feed the wires through the upper
hole in the cylinder (J) and install the two screws (K). Tighten the screws to 95 lb-in (10.7 Nm).
2) Pull the stator wires tightly through the cylinder hole, then route them between the ribs as shown
below. Press the wires down (arrows) to the cylinder as far as possible. The wires must not
interfere with the operation of the governor lever.
FLYWHEEL REMOVAL
After removing the flywheel nut, starter cup, and fan, install Flywheel Puller Tool #19203 to remove the
flywheel.
Note that early production flywheels do not have holes for the flywheel puller tool. Instead, a two-jaw puller
(below) can be installed to remove these flywheels. Briggs & Stratton does not currently provide this type of
tool.
J
K

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FLYWHEEL INSTALLATION
1) After installing the flywheel finger guard (L), thoroughly clean and dry the crankshaft taper. Place the
flywheel key in position in the crankshaft keyway.
2) Align the keyway in the flywheel (M) to the key in the crankshaft and press the flywheel into position.
3) Install the flywheel fan (N) and the starter cup (O) to the flywheel. The bosses on the fan and cup
must fit into the corresponding holes in the flywheel.
4) Start the flywheel nut (P) by hand, and then tighten to 65 lb-ft (88.1 Nm).
L
M
P
N
O

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LOW-OIL MODULE INSTALLATION
The low-oil module is available in either a standard 2-wire version or a lamp indicator 5-wire version. They
are discussed separately below.
Standard Module 2-Wire Installation
1) After connecting the wires, install the module (Q1) to the flywheel finger guard with screw. Tighten
the screw to 55 lb-in (6.2 Nm).
2) Route the module ground wire through the clip (Q2) on the finger guard and between the ribs (Q3) in
the top of the cylinder. Pull the wire tightly, and then press it down to the cylinder as far as possible.
The wire must not interfere with the operation of the governor lever.
3) Route the wire beneath the blower housing mounting boss (Q4).
4) Attach the rocker switch ground wire under the control bracket mounting screw (Q5). Complete the
connections to the rocker switch as shown below.
Q1
Q2
Q3Q4
Q5

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Lamp Indicator Module 5-Wire Installation
The wires and their associated circuits are shown below.
GRN = Ground
RED = Lamp Positive
YEL = Oil Sensor
BLK/WHT = Lamp Negative
BLK1 = Remote On/Off Switch
BLK2 = Ignition Coil
1) Connect the YEL wire to the oil sensor. Position the GRN wire terminal between the module and the
flywheel finger guard (R1), and then install the module (R2) to the finger guard with the screw.
Tighten the screw to 55 lb-in (6.2 Nm).
2) Connect the BLK1 wire to the remote on/off switch on the equipment, if equipped. Connect the BLK2
wire to the ignition coil. Make sure the wires are routed through the clip (R3) on the finger guard and
between the ribs (R4) in the top of the cylinder. Pull the wires tightly, and then press them down to
the cylinder as far as possible. The wires must not interfere with the operation of the governor lever.
3) Route the wires beneath the blower housing mounting boss (R5).
R2
R1
R3
GRN RED
YEL
BLK/WHT
BLK1BLK2
R4
R5

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4) If equipped, attach the rocker switch ground wire under the control bracket mounting screw (R6).
Complete the connections to the rocker switch as shown below.
STATIC / DYNAMIC GOVERNOR ADJUSTMENT PROCEDURE
IMPORTANT: The governor lever must be replaced any time the static governing is adjusted!
1) While holding throttle wide open, rotate the governor shaft clockwise until it stops.
2) Tighten the governor lever nut to 40 lb-in (4.5 Nm).
3) Hold the throttle against the idle stop screw on the carburetor. Adjust the screw as required to obtain
1450 RPM or 1750 RPM, depending on application.
4) Adjust the high speed screw on variable-speed engines or bend the spring anchor tab on fixed-speed
engines to obtain the equipment manufacturer’s Top No-Load speed (+/- 100 RPM).
Spring Color Hole Position Top No-Load Speed Range
Variable Speed
Blue 3 3400 - 3600
Blue 4 3700 - 3800
Blue 5 3900 - 4200
Red 3 3300
White 3 3000 - 3200
Green 3 2600 - 2900
Fixed Speed
Yellow 3 3200 - 3500
Yellow 4 3600 - 3900
Yellow 5 4000 - 4200
Black 3 2600
Black 4 2700 - 2800
Black 5 2900 - 3100
R6