Section 2. General Specifications
GASOLINE MODELS
BGM
NHM
GENERATOR: 4-Pole Revolving Field, Self-Excited, Electronically Regulated, 1-Phase
Power (watts)
5000 6800
Frequency (Hertz)
60
60
Voltage
120 120
Current (amperes)
41.7
56.7
Speed (RPM)
1800 1800
FUEL CONSUMPTION:
No load gph
(1/h)
0.3 (1.3) 0.4 {1.5)
Half load gph
(1/h)
0.5 (1.9) 0.7 (2.6)
Full load gph
(1/h)
0.9 (3.4) 1.3 (4.9)
ENGINE: 2-Cylinder Opposed, 4-Cycle, Spark-Ignited, Side-Valve, Air Cooled
Bore
3.250 inch (83 mm) 3.563 inch (90 mm}
Stroke
2.875 inch (73 mm) 3.000 inch (76 mm)
Displacement
48 inch
3
(782 cc) 60 inch
3
(980 cc}
Compression Ratio
7.0:
1
7.0:
1
Minimum Cylinder Compression
75 psi (517 kPa) 75 psi (517 kPa)
Test Pressure
Oil Capacity (with filter)*
3.5 quart (3.3
I)
3.5 quart (3.3
I)
Intake Valve Clearance (Cold)
0.005 inch (0.13 mm)
0.005 inch (0.13 mm)
Exhaust Valve Clearance (Cold)
0.013 inch (0.33 mm)
0.013 inch (0.33 mm)
Spark Plug Gap 0.025 inch (0.64 mm) 0.025 inch (0.64 mm)
Spark Plug Tightening Torque 8 !bs-ft
(1
0 N-m)
8 lbs-ft
(1
0 N-m)
Ignition Timing (Begin Spec
F)
12° BTDC non-adjustable
12° BTDC non-adjustable
Ignition Timing (Prior to Spec
F)
14°-18° BTDC non-adjustable
14°-18° BTDC non-adjustable
Maximum Fuel Supply Pressure
6 psi
(41
kPa)
6 psi
(41
kPa)
at Carburetor
Maximum Fuel Pump
lift
3 feet (0.9 m) 3 feet (0.9
m)
Fuel Fitting 5/16 inch OD Hose Barb 5/16 inch OD Hose Barb
Exhaust Tailpipe Requirements
1-3/8 inch
ID
18 Ga Steel Tubing
1-3/8 inch ID 18 Ga Steel Tubing
CONTROL AND CRANKING SYSTEM: 12 VDC
Nominal Battery Voltage 12 volts
Minimum Battery Cold Cranking
360/450 amperes
Capacity: Above/Below Freezing
Fuse
F1
(Control Board, Spec A only)
5 amperes slow-blow
Fuse
F2
(Fuel, Spec A only) 5 amperes slow-blow
Fuse
F1
(Control Board, Begin Spec B) 10 amperes
Fuse
F2
(Choke/Fuel, Begin Spec
D)
10 amperes mini-bayonet
*
-See
Periodic Maintenance for oil filling instructions.
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