Honda TRANSALP XL600-650V (1987-2002) [135/291] Carburettors

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4 8 Fuel and exhaust systems 5 1a Pilot screw arrowed XL model carburettor 5 Air fuel mixture adjustment general information Adjustment 1 If the engine rims extremely rough at idle or continually stalls and if a carburettor overhaul does not cure the problem and it definitely is a carburation problem see Section 6 the pilot screws may require adjustment It is worth noting at this point that unless you have the experience to carry this out It is best to entrust the task to a motorcycle dealer tuner or fuel systems specialist The front cylinder s pilot screw is accessible from the right hand side of the carburettor assembly and the rear cylinder s pilot screw is accessible from the left see illustrations Make sure the carburettors are synchronised before adjusting the pilot screws see Chapter 1 2 Before adjusting the pilot screws warm the engine up to normal working temperature Screw in the pilot screw on both carburettors until they seat lightly then back them out to the number of turns specified see this Chapter s Specifications This is the base position for adjustment 3 Start the engine and reset the idle speed to the correct level see Chapter 1 Working on one carburettor at a time turn the pilot screw by a small amount either side of this position to find the point at which the highest consistent idle speed is obtained When you ve reached this position reset the Idle speed to the specified amount see Chapter 1 Repeat on the other carburettor Caution The catalytic converter fitted in the exhaust system of XL650V models may be damaged if the air fuel mixture is maladjusted Restrictions 4 Due to the increased emphasis on controlling exhaust emissions in certain world markets 5 1b Pilot screw arrowed XRV model carburettor regulations have been formulated which prevent adjustment of the air fuel mixture On such models the pilot screw positions are pre set at the factory and in some cases have a limiter cap fitted to prevent tampering Where adjustment is possible it can only be made in conjunction with an exhaust gas analyser to ensure that the machine does not exceed the emissions regulations 6 Carburettor overhaul general information Once the cleaning process is complete reassemble the carburettor using new gaskets and O rings 6 Before disassembling the carburettors make sure you have all necessary O rings and other parts some carburettor cleaner a supply of clean rags some means of blowing out the carburettor passages and a clean place to work It is recommended that only one carburettor be overhauled at a time to avoid mixing up parts 7 Carburettors removal and installation 1 Poor engine performance hesitation hard starting stalling flooding and backfiring are all signs that major carburettor maintenance may be required 2 Keep in mind that many so called car burettor problems are really not carburettor problems at all but mechanical problems within the engine or ignition system or other electrical malfunctions Try to establish for certain that the carburettors are in need of maintenance before beginning a major overhaul 3 Check the fuel tap and strainer the fuel and vacuum hoses the intake manifold joint clamps the air filter the ignition system the spark plugs valve clearance and carburettor synchronisation before assuming that a carburettor overhaul is required 4 Most carburettor problems are caused by dirt particles varnish and other deposits which build up in and block the fuel and air passages Also in time gaskets and O rings shrink or deteriorate and cause fuel and air leaks which lead to poor performance 5 When overhauling the carburettors disassemble them completely and clean the parts thoroughly with a carburettor cleaning solvent and dry them with filtered unlubricated compressed air Blow through the fuel and air passages with compressed air to force out any dirt that may have been loosened but not removed by the solvent A Warning Refer to the precautions given in Section 1 before starting work Removal 1 Remove the fuel tank see Section 2 2 Remove the air filter duct housing according to model see Section 4 On XL models also remove the rear cylinder ignition HT coil see Chapter 5 3 Undo the two screws securing the throttle cable holder to the carburettors and detach the cable ends from the carburettors noting which fits where see illustration 7 3 Undo the screws arrowed and detach the bracket from the carburettors