Question about 1985 Honda CX 500 B

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Rectifier Problem?? When the bike is very hot and I make a quick stop for gas, when I hit the starter button to start it up, it sounds momentarily like it's going to start then it feels as if the battery is dead, nothing, I quickly release the starter button, hit it again and the bike kicks over. I checked the battery cables, all good, recharged the battery, full charge.. This only happens when bike has been running for a while. On a cold start it starts up every time. Never a problem or symptom. Could this be a rectifier problem? Any suggestions?

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  • Anonymous Mar 14, 2014

    I had to replace the regulator rectifier once it burnt out

  • Anonymous Mar 15, 2014

    starter sounds like its working but it just spins if i hit the start button quick sometimes it will start and if i jump start the bike in the morning it will start with the button all day

  • Anonymous Mar 18, 2014

    I have 1984 XT600 have replaced the statar,CDI,coil. The bike runs for a ;little while then stops dead, will start again after a couple of kicks, the will go for 10 mins then stop again. The only thing not replaced is the voltage regulator rectifier, could this cause the problem?

  • Anonymous Mar 27, 2014

    Starter does not turn over, nothing



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If the battery is charged, its charged..... redpoint5 is right, check the battery when hot... If the battery was not charging i would then look into the charging system, rectifier, etc.... Is it an air cooled engine? Sometimes engines can get a little warped when hot... My grandfather had Corvair vans as taxis that somehow always got overheated, after that they would never start hot. So, he had to leave them running all day.... If your battery is OK you may want to have a look at your starter.... Or, bypass the selenoid with a jumper cable and see if the starter kicks over fine when jumped directly...... That would indicate a bad or worn selenoid.

Posted on Nov 20, 2008

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No kidding, try changing/adding oil. I have had similar problems when my cx500 and gl1100 are hot and the oils low--it's thin, slips down fast and just tough to start when holding in clutch lever. If I put it in neutral, it'll start up MUCH easier since the clutch is disengaged all the way. but still the oil is low when the clutch misbehaves like this.

Posted on Mar 21, 2009


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Lets start with the battery. There should be a relay of some kind with two large wires hooked to it, and maybe 5 other smaller wires. Now the one large wire should go to the relay direct from the battery, then the other large wire will go to the starter. When the connection is made between these two large wires the starter should turn. Now there will be one or two smaller wires that control the relay, ( these are hooked to a post or posts on that same start relay), so it will pull in and make the connection between the two large wires to turn the starter. You can check this with an old school 12v test light, hook a hot wire to one side of the start button from a hot wire here in the relay, (one that is hot when the clutch is pulled in or the bike is in neutral -- clear as mud?) or it can be hot all the time, but the starter will turn every time it's touched. Some old school bikes are wired like that anyway. Go and push the starter button and check wires until you find one that gets hot only when you push the start button. Then back to the relay, pull that hot wire from the start button to the relay and touch it to the small post and see if it will now energize the relay when the start button is pushed. Now once all this wiring is fixed it should turn over the engine, when the start button is pushed and it's in neutral or the clutch is pulled in or it will take off on it's on. Next the Alternator, one of the medium sized wires should come straight from the battery to the regulator nothing in between, thats is the regulator exciter wire, next is the, alternator wires, there should be 2 or maybe 4 wires coming out, and if there are 4 they are in pairs these are the A/C output of the alt. These wires will hook to the rectifier, You should have one wire going to ground from the rectifier, then, these 2 wires from the alt. then a wire that hooks to the regulator as 12v hot out of the rectifier. See this is how the Alternator works is produces A/C voltage (say 28, 30 volts A/c) then the rectifier converts it to 12 volts + - D/c the - negative is the ground wire. The regulator will Check the volts at the battery and adjust the output of the 12vdc from the rectifier and let it pass on to the battery to charge it. I hope some of this helps you, I hope it makes sense. I would love a bike like this. . . .

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