Honda AFRICA TWIN XRV750 (1987-2002) [143/291] 16 fuel and exhaust systems
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Honda AFRICA TWIN XRV750 (1987-2002) [143/291] 16 fuel and exhaust systems

Honda AFRICA TWIN XRV750 (1987-2002) [143/291] 16 fuel and exhaust systems

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4 16 Fuel and exhaust systems 10 8 Measuring the float height 10 9 Fit a new O ring into the groove and install the float chamber 8 To check the float height hold the carburettor so the float hangs down then tilt it back until the needle valve is just seated but not so far that the needle s spring loaded tip is compressed Measure the distance between the base of the carburettor body and the bottom of the float with an accurate ruler see illustration The correct setting should be as given in the Specifications at the beginning of the Chapter If the float height is incorrect on brass floats it can be adjusted by carefully bending the float tab a little at a time until the correct height is obtained see illustration 10 5 on plastic floats an incorrect float height can only be corrected by renewing the float 9 With the float height checked fit a new seal into the groove in the float chamber then fit the chamber onto the carburettor and secure it with the screws see illustration 10 On XL models and XRV750 L to N 1990 to1992 models carefully fit the jet needle into the piston see illustration 8 4d Check that the spring is fitted to the retainer and is secure see illustration 8 4c Insert the retainer and push down on the spring using a Phillips screwdriver or suitable socket and rotate it until its tabs lock under the protrusions in the piston see illustration and 8 4a 11 On XRV750 P models onwards 1993 on fit the washer underneath the jet needle head Fit the needle into the piston making sure the washer does not fall off Fit a new O ring into the groove in the needle holder and smear it with oil Check that the spring is in the base of the needle holder or install it if removed Align the tabs on the holder with the slots in the piston and insert the holder pushing it down until the O ring is felt to locate in its groove Remove the screw used on removal from the holder if not already done 12 Turn the diaphragm inside out so that its 10 12a Fit the piston into the carburettor 10 12b then press the diaphragm rim into the groove making sure the loop arrowed locates correctly 10 13a Insert the spring 10 13b then fit the cover 10 10 Insert the retainer locating the spring on the top of the needle then press down and turn to secure its tabs rim faces down Insert the piston diaphragm assembly into the carburettor ensuring the needle is correctly aligned with the needle jet see illustration Keep a finger on the bottom of the piston to keep it raised inserting your finger via the air intake so the diaphragm stays inside out this will prevent the rim popping out of the groove Align the loop on the diaphragm rim with its groove in the carburettor body then press the diaphragm outer edge into its groove making sure It Is correctly seated see illustration 13 Keeping the piston raised fit the spring locating it over the needle holder see illustration Fit the top cover onto the carburettor locating the top of the spring inside the raised section in the cover see illustration Align the protrusion on the cover with the loop on the diaphragm see illustration Make sure the diaphragm rim stays seated in its groove and does not gel pinched by the cover then install the cover screws and tighten them securely You can now let the piston drop Check that the piston moves up and down smoothly 14 On XRV750 P models onwards 1993 on fit new air intake funnel O rings into the groove in the intake side of each carburettor Fit the air funnel Into the holder and rotate it so that its tabs are locked in place Align the cutouts in the air funnel with the corresponding raised lands on the intake bore and fit the pins on the holder into the holes in the carburettor body Tighten the four screws securely 15 If removed install the throttle position sensor See Chapter 5 16 Install the carburettors see Section 7 10 13c making sure the protrusion arrowed aligns with the loop

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