Honda AFRICA TWIN XRV750 (1987-2002) [48/291] Every 24 000 miles 36 000 km 1 7
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Honda AFRICA TWIN XRV750 (1987-2002) [48/291] Every 24 000 miles 36 000 km 1 7

Honda AFRICA TWIN XRV750 (1987-2002) [48/291] Every 24 000 miles 36 000 km 1 7

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Every 24 000 miles 36 000 km 1 27 Disconnect the radiator overflow hose from the bottom of the reservoir and allow it to drain into the container When the reservoir is empty flush It out with clean water then reconnect the hose 5 On XL600V models to drain and clean the reservoir you will either have to syphon out the coolant or remove the reservoir and tip it out Removing the reservoir involves removing the rear shock absorber see Chapter 6 Flushing 6 Flush the system with clean tap water by inserting a garden hose in the radiator filler neck Allow the water to run through the system until it is clear and flows out cleanly If the radiator is extremely corroded remove it see Chapter 3 and have it cleaned by a specialist 7 Clean the drain hole in the water pump then install the drain plug using the old sealing washer 8 Fill the cooling system with clean water mixed with a flushing compound Make sure the flushing compound is compatible with aluminium components and follow the manufacturer s instructions carefully Fit the pressure cap and the reservoir cap 9 Start the engine and allow it to reach normal operating temperature Let it run for about ten minutes 10 Stop the engine Let it cool for a while then cover the pressure cap with a heavy rag and turn it anti clockwise to the first stop releasing any pressure that may be present in the system Once the hissing stops push down on the cap and remove it completely 11 Drain the system once again 28 3b and allow the coolant to drain 12 Fill the system with clean water and repeat the procedure in Steps 6 to 11 Refilling 13 Fit a new sealing washer onto the drain plug and tighten it securely 14 Fill the system with the proper coolant mixture see this Chapter s Specifications Note Pour the coolant in slowly to minimise the amount of air entering the system 15 When the system is full all the way up to the base of the radiator filler neck start the engine and allow it to idle for 2 to 3 minutes Flick the throttle twistgrip part open 3 or 4 times so that the engine speed rises to approximately 4000 5000 rpm then stop the engine This process will bleed any trapped air bubbles from the system 16 If necessary top up the coolant level to the base of the upper radiator filler neck and install the pressure cap Also top up the 28 3c On XL650V models access the drain plug arrowed from underneath coolant reservoir to the UPPER level mark see Daily pre ride checks 17 Start the engine and allow it to reach normal operating temperature then shut it off Let the engine cool then remove the pressure cap as described in Step 2 Check that the coolant level is still up to the base of the upper radiator filler neck If it s low add the specified mixture until it reaches the base of the filler neck Refit the cap 18 Check the coolant level in the reservoir and top up if necessary 19 Check the system for leaks Install the fairing side panels or fairing as required and the belly pan see Chapter 8 20 Do not dispose of the old coolant by pouring it down the drain Instead pour it into a heavy plastic container cap it tightly and take it into an authorised disposal site or service station see Warning at the beginning of this Section Non scheduled maintenance 29 Cylinder compression M check 1 Among other things poor engine performance may be caused by leaking valves incorrect valve clearances a leaking head gasket or worn pistons rings and or cylinder walls A cylinder compression check will help pinpoint these conditions and can also indicate the presence of excessive carbon deposits in the cylinder heads 2 The only tools required are a compression gauge and a spark plug wrench A compression gauge with a threaded end for the spark plug hole is preferable to the type which requires hand pressure to maintain a tight seal Depending on the outcome of the initial test a squirt type oil can may also be needed 3 Make sure the valve clearances are correctly set see Section 16 and that the cylinder head nuts are tightened to the correct torque setting see Chapter 2 4 Refer to Fault Finding Equipment in the Reference section for details of the compression test Refer to the specifications at the beginning of the Chapter for compression figures 30 Engine oil pressure check 1 The oil pressure warning light should come on when the ignition main switch is turned ON and extinguish a few seconds after the engine is started this serves as a check that the warning light bulb is sound If the oil pressure light comes on whilst the engine is running low oil pressure is indicated stop the engine immediately and carry out an oil level check see Daily pre ride checks 2 An oil pressure check must be carried out if the warning light comes on when the engine is running yet the oil level is good Step 1 It can also provide useful information about the condition of the engine s lubrication system 3 To check the oil pressure a suitable gauge and adapter which screws into the crankcase will be needed Honda provide a gauge and adapter part Nos 07506 3000000 and 07510 4220100 for this purpose or one can be obtained commercially You will also need a container and some rags to catch and mop up any residual oil that gets lost In between removing the oil pressure switch and installing the gauge on models fitted with a centrestand place the bike on it otherwise position the bike as upright as possible without it becoming unstable by placing a block under the sidestand so that less oil gathers behind the switch to reduce spillage Check the engine oil level after installing the gauge and replenish if necessary see Daily pre ride checks 4 Warm the engine up to normal operating temperature then stop it 5 Remove the oil pressure switch see Chapter 9 and screw the adapter in its place Connect the oil pressure gauge to the adapter 6 Start the engine and briefly increase the engine speed to 6000 rpm whilst watching the gauge reading The oil pressure should be similar to that given in the Specifications at the start of this Chapter 7 If the pressure is significantly lower than the standard either the pressure relief valve is stuck

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