Briggs & Stratton 420000 - Manual (Page 6)

Document: - page 6 (Black)
Screen angle and frequency: 45.0000, 150.0000
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ENGINE INFORMATION
1. Spark plug wire
2. Carburetor
3. Air cleaner
4. Rotating screen
5. Emission label and Engine
Model Type Code label
xxxxxx xxxx xx xxxxxxxx
6. Oil drain plug
7. Crankshaft
8. 12V electric starter
9. Fuel filter
10. Oil fill/Dipstick
11. Blower housing
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5
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2
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GENERAL INFORMATION
ENGINE MODEL
This is a twin cylinder, L-head, air-cooled engine. It is a low
emissions engine.
In the state of California, the 420000 and 460000 series
engines covered in this manual are certified by the
California Air Resources Board to meet emissions stan-
dards for 125 hours. Such certification does not grant the
purchaser, owner or operator of this engine any additional
warranties with respect to the performance or operational
life of this engine. This engine is warranted solely according
to the product and emissions warranties stated elsewhere
in this manual.
MODEL SERIES 420000
Bore 3-7/16 in. (87.31 mm) . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2-9/32 in. (57.94 mm) . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 42.33 cu. in. (694.0 cc) . . . . . . . . . . . . . . . .
MODEL SERIES 460000
Bore 3-9/16 in. (90.49 mm) . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2-9/32 in. (57.94 mm) . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 45.48 cu. in. (745.2 cc) . . . . . . . . . . . . . . . .
TUNE-UP SPECIFICATIONS
Armature air gap 0.010 – 0.014 in. (0.25 – 0.36 mm) . . .
Spark plug gap 0.030 in. (0.76 mm) . . . . . . . . . . . . . . . . . .
Valve clearance with valve springs installed and piston 1/4 in.
(6 mm) past top dead center (check when engine is cold).
See Repair Manual P/N 271172.
Intake
0.006 – 0.008 in. (0.15 – 0.20 mm) . . . . . . . . . . . . .
Exhaust 0.009 – 0.011 in. (0.23 – 0.28 mm) . . . . . . . . . . .
Note: For practical operation, the horsepower loading
should not exceed 85% of rated horsepower. Engine power
will decrease 3-1/2% for each 1,000 feet (300 meters)
above sea level and 1% for each 10 ° F (5.6° C) above 77° F
(25 ° C). It will operate satisfactorily at an angle up to 15°.