Briggs & Stratton 470000, 540000, 540000 CLEANING DEBRIS, FUEL FILTER, MUFFLER/FUEL SYSTEM, TO ADJUST CARBURETOR, CARBURETOR ADJUSTMENT

MAINTENANCE

CLEANING DEBRIS

Daily or before every use, clean accumulated debris from engine. Keep linkage, springs and controls clean. Keep area around and behind muffler free of any combustible debris.

Model 470000: Use the handle on the radiator screen to lift off for cleaning. Clean screen thoroughly and clean radiator fins.

Model 540000: Remove front carburetor cover, and clean around intake manifold and carburetor.

CAUTION: Do not use water to clean engine parts. Water could contaminate fuel system. Low pressure compressed air may be used, be careful not to damage radiator fins.

CLEAN DEBRIS

RADIATOR SCREEN

HANDLE

CLEAN DEBRIS CLEAN DEBRIS

WARNING

FUEL FILTER

WARNING

PART NO. 807241

Engine parts should be kept clean to reduce the risk of overheating and ignition of accumulated debris.

Drain fuel tank or close fuel shut-off valve before replacing fuel filter. Otherwise, fuel can leak out, creating a fire/explosion hazard.

When replacing fuel filter, ensure clamps are tight and fuel flows into the same direction as the arrow marked FLOW.

MUFFLER/FUEL SYSTEM

WARNING	Replacement parts for the muffler
WARNING	must be the same and installed in
	the same position as the original
	the same position as the original
	parts, otherwise fire can occur.

Replacement parts for fuel system (cap, hoses, tanks, filters, etc.) must be the same as original parts, otherwise fire can occur.

ADJUSTMENTS

CARBURETOR ADJUSTMENT

Differences in fuel, temperature, altitude or load may require minor carburetor adjustment. Air cleaner and air cleaner cover must be assembled to carburetor before starting engine.

The carburetor on this engine is low emission. The carburetor is equipped with an idle speed adjustment screw. The Model 470000 is equipped with an idle mixture valve with a limiter (see inset), which allows some adjustment. DO NOT remove limiter caps. DO NOT force beyond limit.

TO ADJUST CARBURETOR

[1]Start engine and warm up approximately 5 minutes before adjusting.

[2]Place throttle control in SLOW position.

[3]Rotate carburetor throttle lever against the idle speed screw and hold it.

[4]Turn idle speed screw to obtain 1500 rpm

[5]Model 470000 Only: While still holding carburetor throttle lever against idle speed screw, set cylinder #1 idle mixture valve to obtain highest speed. Then set cylinder #2 idle mixture valve to obtain highest speed. Do not force beyond limit. Do not remove limiter caps.

[6]Model 470000 Only: Release carburetor throttle lever. Move throttle control to FAST position. Engine should accelerate smoothly. If it does not, readjust idle mixture valves slightly counterclockwise.

The manufacturer of the equipment WARNING on which this engine is installed

specifies top speed at which the

engine will be operated. DO NOT EXCEED this speed.

WARNING	Engine will be running to perform
	this adjustment. Keep away from all
	rotating and moving parts.

Note: Engines operated at about 3000 feet (900 meters) or higher above sea level may require a high altitude carburetor main jet. If erratic performance is observed, contact a Briggs & Stratton Authorized Service Dealer for cost to install/purchase a high altitude carburetor main jet.

CARBURETOR		LIMITER
CARBURETOR		CAP
THROTTLE		CAP
THROTTLE
LEVER
	IDLE MIXTURE
IDLE SPEED		VALVES
SCREW	CYL # 2	CYL # 1

Only Model 470000 carburetor has idle mixture valves