Serious Charging Problem
Serious Charging Problem
i recently took my 81 honda cb650 to the shop to have a look at the charging system. the battery is brand new so i know thats not the problem. they said the rotor was faulty and that they could take it to an alternator/engine rebuild shop. however, the rebuild shop said it was fine. The shop swears up and down that the rotor is the problem but i dont want to buy a used rotor for it not to be the problem. any thoughts or suggestions would be greatly appreciated. thank you, Ayang.
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- Posts: 323
- Joined: Wed Nov 02, 2011 5:12 am
- Location: Franklin County, Pennsylvania, USA
Re: Serious Charging Problem
You will need an ohmmeter.
Rotor resistance should be 4-10 Ohms between sliprings, no contact to ground.
Stator resistance should be 0.4-0.5 Ohms, between each pair of yellow wires, no contact to ground.
Usually it is the rotor that fails on these bikes, and once failed takes out the rectifier/regulator.
Rotor resistance should be 4-10 Ohms between sliprings, no contact to ground.
Stator resistance should be 0.4-0.5 Ohms, between each pair of yellow wires, no contact to ground.
Usually it is the rotor that fails on these bikes, and once failed takes out the rectifier/regulator.
Folsoml wrote: Good judgement comes from experience. Experience comes from bad judgement.
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE
Re: Serious Charging Problem
Welcome here!
Yes, most probably rotor. In some tricky cases, the rotor fails when hot or/and in rotation, so you can't detect it by the slipring measurement above.
Nevertheless worth checking all charging related cables and contacts.
The RR may survive a rotor failure or not. On page 16-8 of the manual linked below there is a description of a load/performance test for the RR.
Yes, most probably rotor. In some tricky cases, the rotor fails when hot or/and in rotation, so you can't detect it by the slipring measurement above.
Nevertheless worth checking all charging related cables and contacts.
The RR may survive a rotor failure or not. On page 16-8 of the manual linked below there is a description of a load/performance test for the RR.
Cosky's great (free) online manual: http://cosky0.tripod.com
forum links to common technical issues
If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
forum links to common technical issues
If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
Re: Serious Charging Problem
^ Volker - you should make a youtube video of you checking a rotor... Since everyone who visits the site asks how to do it (myself included).
Re: Serious Charging Problem
Someone did a video. Dont remember if it was here or on sohc4 though. Was on a dohc750 but its the same parts.
Found it.
http://www.youtube.com/watch?v=2oIFZofcqXY
Here is the thread from sohc4.
http://forums.sohc4.net/index.php?topic=110322.0
Found it.
http://www.youtube.com/watch?v=2oIFZofcqXY
Here is the thread from sohc4.
http://forums.sohc4.net/index.php?topic=110322.0
Did you clean the tank out?!?!?!?!
Re: Serious Charging Problem
Thanks!
Much easier for me to swap valve stem seals than making a youtube video!
Much easier for me to swap valve stem seals than making a youtube video!
Cosky's great (free) online manual: http://cosky0.tripod.com
forum links to common technical issues
If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
forum links to common technical issues
If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum
Re: Serious Charging Problem
onepieceatatime wrote:You will need an ohmmeter.
Rotor resistance should be 4-10 Ohms between sliprings, no contact to ground.
Stator resistance should be 0.4-0.5 Ohms, between each pair of yellow wires, no contact to ground.
Usually it is the rotor that fails on these bikes, and once failed takes out the rectifier/regulator.
I am doing these same tests on my bike and want to be sure that I am not screwing it up...
When you say "no contact to ground" does that mean ground anywhere on the bike or is there a specific "ground" per specific scenario?
A project bike is very revealing..... like for example..... I've come to realize that every time I project how long something will take, I need to just double it...... I'll then be about 1/2 way there!
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- Posts: 323
- Joined: Wed Nov 02, 2011 5:12 am
- Location: Franklin County, Pennsylvania, USA
Re: Serious Charging Problem
M_Hills wrote:onepieceatatime wrote:You will need an ohmmeter.
Rotor resistance should be 4-10 Ohms between sliprings, no contact to ground.
Stator resistance should be 0.4-0.5 Ohms, between each pair of yellow wires, no contact to ground.
Usually it is the rotor that fails on these bikes, and once failed takes out the rectifier/regulator.
I am doing these same tests on my bike and want to be sure that I am not screwing it up...
When you say "no contact to ground" does that mean ground anywhere on the bike or is there a specific "ground" per specific scenario?
There should be no contact to ground anywhere on the bike, or if the rotor is off the bike, no contact to the body of the rotor as it will be grounded through the engine when mounted on the bike.
Folsoml wrote: Good judgement comes from experience. Experience comes from bad judgement.
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CB900F
1982 CM450A
1997 GL1500SE
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