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Technical Help Forum
Started by VWandSTUDEBAKER at 01-30-2009 11:45 PM. Topic has 23 replies.
  
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 01-30-2009, 11:45 PM
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VWandSTUDEBAKER
Joined on 09-23-2008
Gainesville Florida
Posts 25
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![Devil [6]](http://choppercharles.com/cs/emoticons/emotion-14.gif)
Wont start when hot
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Before I get in to the details, is it a common problem with the CX500 to start fine, but when you ride it and shut it off, it wont start back up till it cools down? Several sets of carbs have been rebuilt and put on. Same thing. All electrical is supposed to be working properly. Do they suffer from some kind of vapor lock ?
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01-31-2009, 3:21 AM
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Blindstitch2002
 
Joined on 05-16-2007
Greenfield Wisconsin
Posts 5,000
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My brothers does the same thing and I suspect it's starter related. The question is when it won't start can it still be push started?
1978 Honda Cx500 Maggot
1979 Honda Cx500 Custom
1980 Cx500 Deluxe
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01-31-2009, 8:26 AM
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Abes_CW
Joined on 04-17-2007
saskatoon
Posts 3,021
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I assumed from the OP that the starter turns, but no fire Stitch.
1983 GL650i
Had 4 CX/GL's at one point this year, down to one, next spring is another adventure!
age 38 (29 plus tax)
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01-31-2009, 8:53 AM
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Blindstitch2002
Joined on 05-16-2007
Greenfield Wisconsin
Posts 5,000
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Oh yeah the starter cranks along pretty good but it never seems like it has the power but it seems like the bike has the best chance the first start of the day and if you let the bike sit for an hour between rides. Getting gas is always a trick for him. I have a starter to swap onto his bike when the weather gets warm.
This is the advice I got.
http://choppercharles.com/cs/forums/54933/ShowPost.aspx
1978 Honda Cx500 Maggot
1979 Honda Cx500 Custom
1980 Cx500 Deluxe
Buy HTTA Items
Quick Reference Info
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02-07-2009, 10:55 AM
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Nittany
Joined on 12-21-2007
Posts 165
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When the engine is hot, you should be able to barely touch the starter button and the engine should kick right over.
In other words, it should start better when hot.
'82 GL500
Bleedin' Blue & White
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02-07-2009, 11:17 AM
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VWandSTUDEBAKER
Joined on 09-23-2008
Gainesville Florida
Posts 25
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The bike is at a shop near here and has been since mid Oct. The bike had plug fouling problems at first and the first shop rebuilt the carbs. (several sets). He finally gave up. I took it to a shop that had been recommended to me over and over by folks I talked to. I went there and was very impressed with the shop and how the guys talked. With the holidays, birthdays and such, I have just let them mess with it. They too have rebuilt several carb sets, check all kinds of electrical parts, but it still wont start MOST of the time after it has been ridden. They say it starts up and riges great at first. They have driven it in to town to get parts and just joy rides. But sofar, this problem has baffled the two main mechanics there that have many years of experience between them. One thing I have not asked is, if they have tried shooting starter fluid into the carbs when it has this problem, but I assume they have tried that.
THey are really at wits end and mess with it when they have some time or get curious.
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03-10-2010, 11:40 AM
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VWandSTUDEBAKER
Joined on 09-23-2008
Gainesville Florida
Posts 25
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Well I finally got my bike back today. Almost 1 1/2 years later. Im just setting down for a moment to refresh this note, so I will do more later. They said they never could figure out what was wrong. But the guy that helped me load it up, said they think they did figure it out. He showed me the area on the back side of the engine towards the rear wheel where they had taken off a plate. Its hard to see, but there is a bolt in the center of what looks like some windings. He gave me a printout that they had gotten off of wikipedia.org.
I just read a little of it and it seems like the information came from this site. Its talking about the stator.
Im a bit confused because this bike shop didnt call it a stator or anything for that matter.
Once I read up on this a little more, I can be more prepared. In the mean time, does any of this make sence? If it is the stator, does the engine need to be pulled ?
Thanks,
David
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03-10-2010, 12:26 PM
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Abes_CW
Joined on 04-17-2007
saskatoon
Posts 3,021
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David, my first thought was to perhaps bad coils. Heat makes them expand, and cracks/faults open up. I wouldn't tend to suspect a stator on a bike that runs perfectly fine, just won't restart.
1983 GL650i
Had 4 CX/GL's at one point this year, down to one, next spring is another adventure!
age 38 (29 plus tax)
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03-10-2010, 12:34 PM
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Abes_CW
Joined on 04-17-2007
saskatoon
Posts 3,021
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Good one lucky!
1983 GL650i
Had 4 CX/GL's at one point this year, down to one, next spring is another adventure!
age 38 (29 plus tax)
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03-10-2010, 12:45 PM
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spanish bandit
Joined on 02-12-2009
southern spain
Posts 4,999
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03-10-2010, 1:12 PM
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VWandSTUDEBAKER
Joined on 09-23-2008
Gainesville Florida
Posts 25
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I dont think its the coils since the shop before this one had thought that and I had new ones put on.
This is where this is coming from:
http://en.wikipedia.org/wiki/Honda_CX_series
Stators in the 1978-81 CX500 serve two purposes. It charges the battery and provides high voltage (90+ volts) to the CDI box to run the ignition system. Stators are located in the rear of the engine and they get very very hot. This eat eventuarlly causes the stator to fail. usually only one of the three windiings fail. Charge, low speed (no advance), or high speed (full advance) winding. When the charging winding fails, the battery does not charge. When the high speed winding fails, the bike will not accelerate well past 3500 rpm, when it weitches over to the high speed winding. If the low speed winding fails, the bike will not start and will have no spark or inetermittent spark. In practice, usually the high speed or charging windings fail.
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03-10-2010, 1:24 PM
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Abes_CW
Joined on 04-17-2007
saskatoon
Posts 3,021
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Will your bike run all day if you just don't shut it off? Will it rev freely past 5000 rpm? Answer yes to both of those and I'd rule out the stator. As lucky mentioned start with the cheap and easy. The main fuse could easily be overlooked by even an experienced mechanic, as it may look perfectly fine as many CXérs here will testify to, but cause amazing misery.
Replace it with an inline blade fuse, it should be done anyway, then see where we go from there.
1983 GL650i
Had 4 CX/GL's at one point this year, down to one, next spring is another adventure!
age 38 (29 plus tax)
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03-10-2010, 4:18 PM
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VWandSTUDEBAKER
Joined on 09-23-2008
Gainesville Florida
Posts 25
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Since I just got the bike back and its still all apart, I really cant say. Although they said it would start up and run great when cold. It didnt have tags, so I dont think they drove it too far away or for very long. They left the tank and seat off which is no problem. They also left the stator? cover off, so I need to figure out how that goes back on.
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03-10-2010, 5:59 PM
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Harold
Joined on 12-28-2006
Beside Washademoak Lake, N.B. Canada
Posts 851
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After you put the bike back together I would run it until it is warm, then shut it down, and when it will not start try doing the starting fluid test you thought of doing, If the bike will not start, try testing the stator as per the stator page at Robs site, check the blue and white wires and the three yellows. Then let the bike cool off and then test the stator again. If the bike starts with starting fluid I would suspect the problem is fuel related.
p.s. If the main fuse were bad, you would have no power to the lights, horn, starter etc. but the bike would still start with a push.
"People are more violently opposed to fur than leather because it's safer to harass rich women than biker gangs."
1978 CX500
1980 CX500 Custom
1981 CX500 Custom
1982 GL500 Silverwing
1975 XL-100
http://www.myspace.com/downwiththebutterfly
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03-11-2010, 3:34 AM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,638
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 Harold wrote: | After you put the bike back together I would run it until it is warm, then shut it down, and when it will not start try doing the starting fluid test you thought of doing, If the bike will not start, try testing the stator as per the stator page at Robs site, check the blue and white wires and the three yellows. Then let the bike cool off and then test the stator again. If the bike starts with starting fluid I would suspect the problem is fuel related.
p.s. If the main fuse were bad, you would have no power to the lights, horn, starter etc. but the bike would still start with a push.
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A bad fuse holder can cause many problems.Replace it as a matter of course even if it looks good,
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03-11-2010, 4:43 PM
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OLD MAN CX500
Joined on 02-02-2010
Posts 164
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![Tongue Tied [:S]](http://choppercharles.com/cs/emoticons/emotion-7.gif)
Re: Wont start when hot
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ad a cx that got the rectifer unhooked from the battery on a idel when she unhooked the engine reved over 6 grand and no thottle on so be carefull ,check to make sure you gotr spark at the plugs when hot sound like a week cdi box when hot as long as they are running they are good but when shut down dont want to start that sounds like mine when it headed south on me hope this helps
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03-11-2010, 5:26 PM
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Cobram
Joined on 06-23-2007
Boston, MA
Posts 1,545
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Had the exact same problem, took lots of cranking or waiting for the bike to cool off to get going again. Shortly thereafter I was stranded with a dead CDI unit. Not the stator, because replacing the CDI with a used OEM one got the bike running again and the hard/no start when hot disappeared.
Swap with a known good CDI unit and see if the problem goes away is the only real way to test it IMHE.
1978 CX500 - I live on a one-way street that's also a dead end. I'm not sure how I got here, or how I'm going to get out.
Four wheels move the body; Two wheels move the Soul.
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03-11-2010, 7:31 PM
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Harold
Joined on 12-28-2006
Beside Washademoak Lake, N.B. Canada
Posts 851
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I was going to suggest CDI if the stator tested OK, cheaper to test a stator than buy another CDI box 
"People are more violently opposed to fur than leather because it's safer to harass rich women than biker gangs."
1978 CX500
1980 CX500 Custom
1981 CX500 Custom
1982 GL500 Silverwing
1975 XL-100
http://www.myspace.com/downwiththebutterfly
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03-12-2010, 1:15 PM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,638
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03-12-2010, 4:28 PM
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VWandSTUDEBAKER
Joined on 09-23-2008
Gainesville Florida
Posts 25
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Im pretty sure its not the carbs. I bought two exta sets and they rebuilt all three. All had the same results.
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03-12-2010, 5:34 PM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,638
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03-12-2010, 6:00 PM
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Shep
Joined on 01-30-2007
UK.2x1980CX500A
Posts 7,638
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Honda CX500 & G... » CX500 GL500 Tra... » Technical Help ... » Wont start when hot
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