Cool. Make sure you test the regulator/rectifier. Sometimes once the rotor goes, it will take the reg/rec with it. I can upload the service manual to my site if you don't have it.
Thanks I will. Had trouble getting a screw out and snapped off a brush, so in ordering a new set I went ahead and got a new rectifier/regulator. Should be pretty much new when I finish. A bit pricey but I'd like reliability and I'm not paying for labor.
The right way to use a digital ohmmeter on low ohms is to short the test leads together, note the reading and then subract that reading from the result. This will compensate for the resistance of the test leads.
When I went to put the cover on it was a little tight with the Stator fitting on the Rotor. Gave it a little tap with the mallet and she settled nicely. Before I replaced the Rotor i had no issues with the fuses, Now I'm wondering if I fried one of the other charging units.
Just picked up an '81 CB650. The seller had work done last year and the wrench at Honda said the stator needs replacing. I ordered the stator and the rotor figuring from what you showed the rotor would probably need replacing anyways, better to be safe than sorry I guess.
You need to find out why it is not charging, otherwise it can get expensive and frustrating. You can inspect the rotor. The insulation usually deteriorates and it shorts out. You can check the rotor & stator with a multimeter. You can check the output of the alternator. Also, you can check the reg/rec unit.
MatthewMCRepair yes it is after 3 days of research, wire diagrams, and frustration trying one thing after another spending way more money than needed, I found this video now with a great relief its charging and I have a lot of back up parts if anything else goes. and the rear axel trick worked great. I have a 1982 cb750f I used it on
How easy should it be to pull the axle out? Book says you gotta do a lot of loosening of bolts related to the brake and chain tensioner. Was hoping you could just slip it out then back in
No I didn't. The bike is still at his house, I was going by what he told me. Do you think at least the rotor was a good idea? For sure it is not charging. Being in Canada most parts have to be ordered from the State's, so things are not cheap. But I do like the bike and my test ride showed it to be running very well. Thanks.
I have no idea how to check the regulator. I did order the manual for the bike. If you could tell me how to check it though I would really appreciate it as I'd order one if it's bad. Still to cold here for riding anyways. Thanks for your help.
The rotor was purchased on ebay since cost was less. It was a rebuilt with core charge. The boots can be bought any place online that sells OEM honda parts.
hi. I found a 1981 cb650C in a junkyard for $400. The guy says it runs. It has 18k on the odometer. I am wondering if this is a bike that's pretty good? Ive never owned a moto before and am pretty mechanically inclined BUT I've never worked on a bike or a carb before. Are these pretty cool bikes? Pretty inexpensive to fix up? thanks so much!
hey, first off, really nice video it helped alot, i have a question tho, when i test my rotor like you did im getting like 1.5 - 2 ohms, you said that its between 4.2 and 5 so does that mean that my rotor is done? im looking into it because my battery is not charging, so would that be my problem you think?
+MatthewMCRepair i did not, i will do that and test again, something is off for sure, regulator isnt problem because thats been changed so im thinking stator or rotor
Hello Matthew MC, Im running good (4.6) on the Ohms interrings. but checking the the same ring ohms , i am getting 1.2 on both rings (consistent). Would this indicate a faulty rotor? Thanks
You should get 0 ohms on the same ring. Lightly clean the surface and try again. This test really does not mean anything other than you have continuity on that ring.
I have a problem with my 81 cb650. sometimes it will start up all day with no issues, but other days i will need to jump start it. some days its doesnt't start at all... just today it shut off on me at a red light. I just tested the battery and its all good??
forgot to mention that I'd intend to clean it up and ride it but as I get used to it, chop the rear and turn it into a bobber style with mini ape hangers.
MatthewMCRepair so how about when I test the charging rotor like you did ,it just beeps and grounds out like I’m touching the 2 ends together( I apologize for all the questions I just can’t find a shop to touch it)
Was doing some research and it's definitely an aftermarket one, that's good for you! Might get one myself. Looks like it's an Electrosport Industries: cl.ly/0x1m1I2e2m0V
I may be one of the few that this trick (or the actual OEM puller for that matter) didnt work. I had to use the puller, a cutting torch, and persuasion with a hammer to get the damn rotor off.
would a bad rotor or stator cause the bike to stall after running for about 10-15 minutes and have issues starting while still hot? I have an 81 cb650 with this issue
@@soulchief1532 Have you hooked a multimeter up to see if it is charging? But to answer your question, yes a bike will eventually die if charging system is not functioning.
@@HTMR I did hook it up yesterday and it was charging fine at idle, it got up to about 14 volts when I started opening the throttle a little and getting it warm. Maintained about 13.1 after that. Then I shut it off and it dropped clear down to 12.1 and wouldn't start
@@soulchief1532 I had a similiar situation on this bike. Turns out the rear brake switch was always "closed", so brake lights were on all the time (2 bulbs) and it killed the battery. So I would suggest pulling one fuse at a time and see if your problem goes away. There might be an electrical load that is not supposed to be on. This goes to show that stock charging system is marginal.
my rotor went bad with no continuity brtween the rings . I bought a puller for 5 bucks went down to the junkyard and got an identical one from a cb900 for 20 bucks and never had a problem with it again .
Hello! I have a piece of shit '80 CB650 that just randomly started running on three and misfiring. New spark plugs didn't do a thing. Could this be the problem?
