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Missing at high speeds/rpm

  • Thread starter Thread starter Scudder
  • Start date Start date
Ask him how to tune a Tillotson for altitude (as a joke)

I'm 58, but I have a couple of advantages. I started turning wrenches in 1970. I also have had the advantage of knowing a number of highly skilled individuals in those 41 years who taught me all sorts of stuff

Sounds like you're hitting the GS trifecta - ignition, carbs, charging - just keep looking around here, reading and posting up your questions (Ed will tell you to try the Search function)
 
Big T said:
Like Cliff, he's not likely to have a good understanding of these issues because he's too young
Click to expand...


You flatter me sir. :D

I do happen to remember where I was and what I was doing when JFK was shot. :eek:

Mr. Scudder, you should replace the separate rectifier and regulator units in your charging system with an upgraded integrated r/r unit from our good friend duaneage. Move the ground wire from the lousy ground connection on the battery box directly to the negative terminal of the battery. Do a live test of your stator, following the fault finding procedure in the Stator Papers, and replace if necessary.

Since you have a loose yellow wire it's possible that someone may have modified the charging system already. Verify whether or not you have a separate regulator and rectifier.

Thank you for your indulgence,

BassCliff
 
I suspect I've got an aftermarket alternator because it only has 3 wires coming off it (it is cleaner than everything else)and in my wiring diagram there should be a way to attach the 3 wires of the rectifier and one yellow form the regulator. Would it be ok to rig up a double female attachment to the yellow alternator so I can attach both the rectifier and the regulator? It appears that this is what is done with the stock alternator in the diagram. Or will I be goofing something up?

I know I've got to change out the condensors but not having the regulator attached concerns me. I do plan to upgrade to an intergrated regulator/rectifier when I get on the the other side of my condensor (missing) issues.

scudder
 
Hi,

I think your charging system should look like this:

77-78_GS750chargingsystem.png


Does your stator output have three yellow wires or are they the original colors, as above?

In the diagram above you see the (original) yellow wire has a "Y" connection to both the rectifier and the regulator.

But I agree, fix the ignition stuff first and then we'll tackle the charging system.


Thank you for your indulgence,

BassCliff
 
Actually the three wires coming off the alternator are black (not yellow as I said earlier). So that indicates that it is an aftermarket deal to me. I will have to have a "Y" connector to hook up both the rectifier and regulator up to the alternator. This will be added to my list, and be upgraded after ignition issues are resolved. Is there a problem in putting a "Y" connecter on the appropriate alternator wire and hooking both up, or should I wait for the upgrade? Thanks.

I'm wondering what I'm going to do with my free time when (if ever) I get this thing running right.

Scudder
 
Hi,

Aftermarket 12-pole stators are hard to find. It must have cost a pretty penny.

If you still have the separate regulator and rectifier on your bike, There should be no issues with hooking everything up according to the original wiring diagram.

But as long as you have a good battery, you don't really need a functioning charging system just to sort out the ignition issues. You can keep your battery charged with a trickle charger while you replace condensers and button down the ignition. Then you can install a new integrated r/r unit after that. It's up to you.


Thank you for your indulgence,

BassCliff
 
Scudder said:
I'm wondering what I'm going to do with my free time when (if ever) I get this thing running right.Scudder
Click to expand...

Well, I hope you bought an older bike because you enjoy solving problems.

Most of the GSes suffer from previous owner syndrome (POS) where some hack has done unspeakable things rather than a proper repair, or maintenance

So far, yours seems to just be a victim of old age, Parts wear out or just go bad (like your condensors) after 10, 20 or 30 years

Your problems seem pretty small so far, It starts and runs and may charge with just a minor repair

While you're making that electrical Y, make a ground and run it from the rectifier directly to the battery negative pole. That seems to make a huge difference in charging.

My 78 still has the original regulator and rectifier from 1978, so they can hold up
 
I do enjoy solving problems, and I'm almost a year (off an on) into this one. I have learned a lot along the way, but after talking with you guys realize I've still got a lot to learn, which I'm looking forward to.

Thanks

Scudder
 
After reading all your posts I would recommend u check your charging system and if it is charging properly forget about the yellow wire and work on getting the bike to run properly... just my 2 cents... good luck...
 
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