Suzuki VL800 Service Manual

FUEL AND LUBRICATION SYSTEM 5-11
AIR
MIXTURE
FUEL
SLOW SYSTEM
This system supplies fuel to the engine during engine operation with throttle valve 1 closed or slight opened.
The fuel from the float chamber 2 is first passage and metered by the pilot jet 3 where it mixes with air
coming in through #1 pilot air jet 4 and #2 pilot air jet 5.
This mixture, rich with fuel, then goes up through pilot pipe to pilot screw 6. A part of the mixture is dis-
charged into the main bore out of by-pass ports 7. The remainder is then metered by pilot screw and sprayed
out into the main bore through pilot outlet 8.
TRANSIENT ENRICHMENT SYSTEM
The transient enrichment system is a device which keeps fuel/air mixture ratio constant in order not to gener-
ate unstable combustion when the throttle grip is returned suddenly during high speed driving. For normal
operation, sum of the air from the #1 pilot air jet 4 and #2 pilot air jet 5 keeps proper fuel/air mixture ratio. But
when the throttle valve is closed suddenly, a large negative pressure generated on cylinder side works on to
a diaphragm 9. The ball 0 held by the diaphragm 9 closes the air passage from #2 pilot air jet 5, therefore,
the fuel/air mixture becomes rich with fuel.
This system is to keep the combustion condition constant by varying the fuel/air mixture ratio by controlling air
flow from the pilot air jet.

Suzuki VL800 Specifications

General

Engine Type	4-stroke, liquid-cooled, SOHC, 45-degree V-twin
Displacement	805 cc
Bore x Stroke	83.0 mm x 74.4 mm
Compression Ratio	9.4:1
Fuel System	Fuel injection
Ignition	Electronic ignition (transistorized)
Transmission	5-speed constant mesh
Final Drive	Shaft drive
Front Suspension	Telescopic, coil spring, oil damped
Rear Suspension	Link type, coil spring, oil damped
Front Brakes	Disc brake
Rear Brakes	Drum brake
Wheelbase	1, 655 mm (65.2 in)
Ground Clearance	140 mm (5.5 in)
Seat Height	700 mm (27.6 in)
Front Tire	130/90-16M/C 67H
Rear Tire	170/80-15M/C 77H
Overall Height	1, 110 mm (43.7 in)