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GS 850 Charging

  • Thread starter Thread starter Chris Finlay
  • Start date Start date
C

Chris Finlay

Guest
Hi all.

l have replaced the stator. Rectifier/Regulator and the battety with new units and it is still not charging fully. Ar 3000rpm it onvy reaches 12.7v and with lights on drops to 12.3v. At a steady 4000rpm with no lights it will creap up to 13v. Can you offer any advice. It is a 1979 GS850. When I switch off the ignition the battery reads 12.4v

Chris.
 
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The 1979 850 originally used a 12-pole stator, and of course a matching rotor. Unless you specifically sought a 12-pole stator, that's at least one problem. A stator for an 80 or later won't do it.
 
robertbarr said:
The 1979 850 originally used a 12-pole stator, and of course a matching rotor. Unless you specifically sought a 12-pole stator, that's at least one problem. A stator for an 80 or later won't do it.
Click to expand...

I also suspect this is your issue -- there are no new 12 pole stators available, and you didn't mention having yours re-wound.

The simplest solution is probably to install a rotor from a 1980-83 GS850. Then you'll enjoy an upgraded electrical system.

Post a "part wanted" ad in the proper section of the forum, and you'll probably find one cheap pretty easily. Pulling the old one can be a pain in the rear, though.
 
Thanks. How many segments should be in the rotor for the different stators.
 
Stick a screwdriver or nail in the rotor, slide it around, counting how many times it grabs on a magnetic pole.

A stock 12-pole rotor will grab 4 times. If it has been upgraded to a newer 18-pole system, it will grab 6 times.

I have some 12-pole stators that should be arriving any day, if you are interested.

.
 
Thanks. Looks like I have the wrong rotor for the stator. I have a spare engine with the correct rotor so I can swop it over. I will let you know how it works.
 
Numbers have never been given in this thread, so please verify:

How many "grabs" on the rotor?

How many poles on the replacement stator?

.
 
Steve said:
Numbers have never been given in this thread, so please verify:

How many "grabs" on the rotor?

How many poles on the replacement stator?

.
Click to expand...

Steve, you may be incorrect on the "number of grabs". I just verified on one of my spare GS1000 engines and it "grabbed" 12 times on a 12 pole rotor per 360 degrees. Makes sense since the stator needs to have a pole transition for each of the stator pole windings as it rotates. Each pole of the stator needs to cross with a magnetic field at the same time as it rotates through. It's why a 12 pole stator doesn't work in an 18 pole rotor and visa versa.

Edit:
Now there are actually 3 segments per rotor so each segment would have the number of grabs you quoted. On a 12 pole rotor you would have 3 segments x 4 poles (grabs) per segment = 12 poles (grabs) total as you go around one revolution of the rotor.

Just wanted to clarify what should be expected when checking how many poles on a stator are needed for a given rotor.
 
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You could be right (about me beeing wrong :oops:). I will have to check a spare rotor that I have.

I just seem to remember that the number of "grabs" was 1/3 of the number of poles on the stator.

.
 
Hi all. Managed to remove one rotor with a 2 leged pullers bur the other one refuses to budge. I have soaked it in wd40. I will try again tomorrow.
 
Chris Finlay said:
Hi all. Managed to remove one rotor with a 2 leged pullers bur the other one refuses to budge. I have soaked it in wd40. I will try again tomorrow.
Click to expand...

Soak it with PB parts blaster, liquid wrench or the like yer just wd40ing in the wind with that stuff.
 
WD never really did it for me either. PB Blaster works pretty good. Especially when combined with heat.
 
+1 on the heat but for me 50% acetone / 50% ATF works a treat and is cheap. I refilled a pump spray bottle I had lying around - shake it up, spray it on and let it do the work.

WD is great for Displacing Water and not much else. I have 2 cans of PB Blaster that I don't intend to replace when they run out. The acetone/ATF mix is my new go to.

Edit: autocorrect!
 
Chris Finlay said:
Tried a hydraulic pullers on it tonight without success.
Click to expand...

It's complicated by the presence of the magnets and 30+ year old epoxy (neither of which like heat), but a belt of heat judiciously applied, and a shock blow will usually do the trick. If you can get a puller around the head of it and couple that to a slide hammer...
 
Finally got it off in one piece. What is the best and safest way to torque it with the engine in the bike.
 
I put it in 5th gear and lock up the rear wheel by putting a crow bar between the mag wheel spokes and the swing arm. You can also have someone stand on the rear brake while you torque it down.

Others may have another idea.
 
Really appreciate all your help. Next job to fix the indicators. When i fit a standard car flasher unit the indicators work but will not flash. Any suggestions .
 
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