How to Troubleshoot a CX500
Honda's CX500 motorcycle is a no-frills commuter model. Designed to be robust, affordable and reliable, the CX machines have long been a favorite of couriers and inner-city riders due to the motorcycle's ability to withstand abuse. Though the bike is famed for its legendary reliability, it can develop problems like any other machine. Following a few basic troubleshooting steps typically helps isolate prevalent issues.
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Instructions
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Insert the key into the ignition and attempt to start the engine. If the engine will not crank, check that the starter motor is spinning by listening to it closely. If it isn't, remove the battery and charge it. Re-install it after an overnight charge and try again, listening to the starter motor. If the battery is successfully spinning the starter motor and the engine is cranking, the problem may have been an insufficiently charged battery. If the starter motor spins slowly, even with a fully charged battery, it may be that the brushes in the starter motor are worn. The starter motor should be replaced.
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Listen to the central crank of the engine while you fire the ignition. If the crank is not turning, this is likely a problem with the starter clutch or the idle gear in the gearbox. These components are best replaced by a professional if you are not familiar with them.
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3
Check the carburetors by loosening the small grub screw on the underside that will drain any fuel inside. If fuel is reaching the carburetors, it will dribble from the bottom when the screw is released. Release the screw, drain the fuel, then replace it and try to start the engine before checking again. If fuel is reaching the carburetor, it can be eliminated as the source of the problem. If no fuel drains from the carb, The fuel line is clogged somewhere along the line. Remove the carb and the fuel lines from the tank. Clean everything thoroughly and replace.
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Remove the spark plugs from the top of the engine, and reconnect the plug to the lead. Keep your hands clear and hold the tip of the plug to an exposed piece of metal on the bike's frame, away from the fuel tank. Try the ignition again --- a small blue spark should jump from the tip of the plug. If there is no spark, this suggests a fault with the plug, the CDI or the master ignition switch.
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Check the tips of the plugs for moisture or excessive carbonization. If they are wet, then the engine may be flooded. Drain the carburetors with the drain screw and try again. If they are heavily carbonized, scrape them clean with a stiff wire brush and restart the engine. If this does not work, replace the plugs.
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