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Engine speed is controlled by movement of the control lever. To adjust: Move control lever to HIGH speed position. Loosen screw on swivel. Move wire through swivel until desired operating speed is obtained. Retighten swivel screw, bend loose end of wire around swivel. Cut off excess wire.

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Bore-3-7/16"; Stroke-3-1/4"; Displacement-30.16 cu. in.; Horsepower:

The horsepower ratings listed above are established by standard I.C.E.I. procedures. For practical operation, the horsepower loading should not exceed 85% of these ratings. Engine power will decrease 3%% for each 1,000 ft. above sea level and 1 % for each 10 degrees above 60 degrees F.


Engines stored for over 30 days should be completely drained of fuel to prevent gum deposits forming on essential carburetor parts, fuel filter, fuel lines and tank.

a. Remove filter bowl, open shut-off valve and drain tank completely.

b. Replace filter bowl. Leave fuel valve open.

c. Operate engine until it stops from lack of fuel.

d. While engine is still warm, drain and clean the oil sump. Refill with fresh oil.

e. Remove spark plug, pour one ounce of SAE 30 oil into cylinder and crank slowly to spread oil. Replace spark plug.

f. Clean dirt and chaff from cylinder, cylinder head fins and blower housing.

Major engine repairs should not be attempted unless you have the proper tools and a thorough knowledge of internal combustion engines.

6.68 h.p. at 1800 r.p.m.
9.65 h.p. at 2400 r.p.m.
11.63 h.p. at 3000 r.p.m.
12.00 h.p. at 3300 r.p.m.
11.80 h.p. at 3600 r.p.m.
Torque (Ft. Lbs.) 21.2 at 2600 RPM
Intake Valve Clearance .007" -.009"
Exhaust Valve Clearance .017" -.019"

[Source:  Briggs & Stratton Operating and Maintenance Instructions, Models 300401 to 300424, Form  270453-116, courtesy of Mike Decoteau]



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