General information
The fuel system consists of the fuel tank, the fuel tap(s) and strainer(s), the carburettors, fuel hoses and control cables, and on XRV750 models the fuel pump and in-line filter.
XL600V models
The fuel tap is semi-automatic in that it has both a manually operated valve and a vacuum operated valve, and has an integral strainer inside the fuel tank. The manual valve need only be closed (FUEL OFF) when the fuel tank is removed. With the manual valve open (ON or RES), the automatic valve is opened by a vacuum acting on a diaphragm, the vacuum being created when the engine is turned. If the manual valve is closed, the diaphragm valve will not bypass it when the engine is turned. The reserve (RES) position on the fuel tap allows a few miles to be covered after the main tank has run out. and serves as a low fuel level warning.
The carburettors are Keihin CV types. For cold starting, a choke lever mounted on the left-hand handlebar and connected by a cable, controls an enrichment circuit in each carburettor. Air is drawn into the carburettors via an air filter housed under the seat.
The exhaust system is a two-into-one design.
XL650V models
The fuel tap has an automatic vacuum operated valve with an integral strainer inside the fuel tank. The valve is opened by a vacuum acting on a diaphragm, the vacuum being created when the engine is turned. There is no manual facility on the tap. There is also no reserve facility, but a level sensor inside the tank transmits to a fuel gauge in the instrument cluster.
The carburettors are Keihin CV types. For cold starting, a choke lever mounted on (he left-hand handlebar and connected by a cable, controls an enrichment circuit in each carburettor. Air is drawn into the carburettors via an air filter housed under the fuel tank.
The exhaust system is a two-into-one design.
XRV750 models
The XRV750-L to N (1990 to 1992) models have two fuel taps, and P models onwards (1993-on) have one tap. Each tap is of the gravity feed type with an integral strainer inside the fuel tank.
The taps have a manually operated valve which need only be closed (OFF) when the fuel tank is removed. When the manual valve is open, fuel flow is created by a pump which is controlled by a relay that actuates the pump circuit when the engine is turned. If the manual valve is closed, fuel will not flow when the engine Is turned.
XRV750-L to N (1990 to 1992) models have no manual reserve facility, but a level sensor inside the tank transmits to a low fuel warning light in the instrument cluster. On later models the reserve (RES) position on the fuel tap allows a few miles to be covered after the main tank has run out. and serves as a low fuel level warning.
The carburettors are Keihin CV types. For cold starting, a choke lever mounted on the left-hand handlebar and connected by a cable, controls an enrichment circuit in each carburettor. Air is drawn into the carburettors via an air filter housed under the seat on XRV750-L to N (1990 to 1992) models, and in front of the fuel tank on XRV750-P models onwards (1993-on).
The exhaust system is a two-into-one design.
Precautions
Warning: Petrol (gasoline) is extremely flammable, so take extra precautions when you work on any part of the fuel system. Don't smoke or allow open flames or bare light bulbs near the work area, and don't work in a garage where a natural gas-type appliance Is present. If you spill any fuel on your skin, rinse it off immediately with soap and water. When you perform any kind of work on the fuel system, wear safety glasses and have a fire extinguisher suitable for a class В type fire (flammable liquids) on hand.
Always perform service procedures in a well-ventilated area to prevent a build-up of fumes.
Never work in a building containing a gas appliance with a pilot light, or any other form of naked flame. Ensure that there are no naked light bulbs or any sources of flame or sparks nearby.
Do not smoke (or allow anyone else to smoke) while in the vicinity of petrol or of components containing It. Remember the possible presence of vapour from these sources and move well clear before smoking.
Check all electrical equipment belonging to the house, garage or workshop where work is being undertaken. Remember that certain electrical appliances such as drills, cutters etc create sparks in the normal course of operation and must not be used near petrol or any component containing it. Again, remember the possible presence of fumes before using electrical equipment.
Always mop up any spilt fuel and safely dispose of the rag used.
Any stored fuel that is drained off during servicing work must be kept in sealed containers that are suitable for holding petrol, and clearly marked as such; the containers themselves should be kept in a safe place Note that this last point applies equally to the fuel tank if it is removed from the machine: also remember to keep its cap closed at all times.
Note that the fuel system consists of the fuel tank and tap, with its cap and related hoses.
Read the Safety first! section of this manual carefully before starting work.