Honda AFRICA TWIN XRV750 (1987-2002) [283/291] Fault finding
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Honda AFRICA TWIN XRV750 (1987-2002) [283/291] Fault finding

Honda AFRICA TWIN XRV750 (1987-2002) [283/291] Fault finding

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REF 36 Fault Finding 1 Engine doesn t start or is difficult to start Starter motor doesn t rotate Engine kill switch OFF Fuse blown Check main fuse and starter circuit fuse Chapter 9 Battery voltage low Check and recharge battery Chapter 9 Starter motor defective Make sure the wiring to the starter is secure Make sure the starter relay clicks when the start button is pushed If the relay clicks then the fault is in the wiring or motor Starter relay faulty Check it according to the procedure in Chap ter 9 Starter button not contacting The contacts could be wet corroded or dirty Disassemble and clean the switch Chapter 9 Wiring open or shorted Check all wiring connections and harnesses to make sure that they are dry tight and not corroded Also check for broken or frayed wires that can cause a short to ground earth see wiring diagram Chapter 9 I Ignition main switch defective Check the switch according to the procedure in Chapter 9 Replace the switch with a new one if It is defective Engine kill switch defective Check for wet dirty or corroded contacts Clean or replace the switch as necessary Chapter 9 Faulty neutral side stand where fitted or clutch switch Check the wiring to each switch and the switch itself according to the procedures in Chapter 9 Starter motor rotates but engine does not turn over Starter clutch defective Inspect and repair or renew Chapter 2 Damaged idle or starter gears Inspect and renew the damaged parts Chapter 2 Starter works but engine won t turn over seized L Seized engine caused by one or more internally damaged components Failure due to wear abuse or lack of lubrication Damage can include seized valves rockers camshafts pistons crankshaft connecting rod bearings or transmission gears or bearings Refer to Chapter 2 for engine disassembly No fuel flow No fuel in tank Fuel tank breather hose obstructed Fuel tap strainer or in line filter XRV models clogged Remove the tap and clean it and the filter Chapter 4 i Fuel tap vacuum hose split or detached XL models Check the hose Z Fuel tap diaphragm split XL models Remove the tap and check the diaphragm Chapter 4 Fuel line clogged Pull the fuel line loose and carefully blow through it Float needle valve clogged For both of the valves to be clogged either a very bad batch of fuel with an unusual additive has been used or some other foreign material has entered the tank Many times after a machine has been stored for many months without running the fuel turns to a varnish like liquid and forms deposits on the inlet needle valves and jets The carburettors should be removed and overhauled if draining the float chambers doesn t solve the problem Fuel pump faulty XRV models Check the fuel pump flow and renew the pump if necessary Chapter 4 Engine flooded Float height too high Check as described in Chapter 4 Float needle valve worn or stuck open A piece of dirt rust or other debris can cause the valve to seat improperly causing excess fuel to be admitted to the float chamber In this case the float chamber should be cleaned and the needle valve and seat inspected If the needle and seat are worn then the leaking will persist and the parts should be replaced with new ones Chapter 4 Starting technique incorrect Under normal circumstances i e if all the carburettor functions are sound the machine should start with little or no throttle When the engine is cold the choke should be operated and the engine started without opening the throttle When the engine is at operating temperature only a very slight amount of throttle should be necessary lithe engine is flooded turn the fuel tap OFF or disconnect the vacuum hose according to model see Chapter 4 and hold the throttle open while cranking the engine This will allow additional air to reach the cylinders Remember to turn the fuel tap back ON or attach the vacuum hose No spark or weak spark I i Ignition switch OFF Engine kill switch turned to the OFF position Battery voltage low Check and recharge the battery as necessary Chapter 9 Spark plugs dirty defective or worn out Locate reason for fouled plugs using spark plug condition chart and follow the plug maintenance procedures Chapter 1 Spark plug caps or secondary HT wiring faulty Check condition Renew either or both components if cracks or deterioration are evident Chapter 5 Spark plug caps not making good contact Make sure that the plug caps fit snugly over the plug ends Ignition control unit defective Check the unit Chapter 5 Pulse generator coil defective Check the unit Chapter 5 I I Ignition HT coils defective Check the coils Chapter 5 Ignition or kill switch shorted This is usually caused by water corrosion damage or excessive wear The switches can be disassembled and cleaned with electrical contact cleaner If cleaning does not help renew the switches Chapter 9 Wiring shorted or broken between a Ignition main switch and engine kill switch or blown fuse b Ignition control unit and engine kill switch c Ignition control unit and ignition HT coils d Ignition HT coils and spark plugs e Ignition control unit and pulse generator coil Make sure that all wiring connections are clean dry and tight Look for chafed and broken wires Chapters 5 and 9

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