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Re: I was told the CDI unit on a 1980 Honda CX 500 is...
Takes special equipment to test the CDI ... does your bike start? run? if not ... there is that possibility that who ever told you it is bad is correct.
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The Honda Rider Club offers free membership which includes access to a generic service manual ... a paid membership gets you access to the service manual for your model according to info at the site. http://hrca.honda.com/
Drain the radiator and remove the fuel tank. The thermostat is in a housing between the two cylinder heads. Two 6 mm bolts(10 mm wrench)hold the stat cover down. Replace the o-ring and thermostat together. Thermostat can be tested by placing in a pot of water on the stove, heat the water, and check opening temperature with candy thermometer. I had a friend that removed his and never put it back. It just took longer for the bike to warm up. good for warm climates but not cold climates.
relay is bad or connection is--chec battery cable titeness or starter button--if u hav a kik starter buy a batt eliminator capacitor n hook in place of battery and bike will run like the old days
Perhaps you got one of the new Honda 1980 Tech where they are using a Turbo to gain HP(Kw). It is a white elephant but a technology experiment. Bike too heavy for turbo, not very agile. Google CX500 and read it's review in NZ Bikers magazine 2010 March edition.
Bypassing the kill switch means removing the connection of the black / white wire either at the emergency stop switch (kill/run), ignition switch or preferably at the CDI connector.
Additionally, you can try:
start with the side stand up;
check/wiggle the 6 wires coming from the stator going to the CDI.
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