Why is my battery burning up in my 1993 fxr? - FXR Super Glide Harley Davidson Motorcycles

Most likely cause would be a faulty voltage regulator. You need to get it on a battery/charge testing machine,bring the revs up to 2000 rpm,and with a fully charged battery,it should not charge any higher than 14.0 volts at 2000 rpm.

Check the drive belt for proper tension. Also check the wheel bearings for burning or scoring.

Take your battery out and have it load tested. It sounds like you have one or more cells shorting out under a load. A 12 volt battery is made up of six 2 volt cells. The output voltage and current delivery of a battery with shorted cells in it depends on how many cells are shorted and where they are located within the battery. This is the most obvious thing causing the problem. If the starter is drawing the battery down that low, it must be drawing a tremendous amount of current and it would probably be burning the battery cables with that large of a current draw. If you have 300km on a top end job with no problems, I doubt you have a problem with that. A problem in that area would have shown up well before now. Although, a fresh top end will put more strain on the starter and battery due to the increase in compression. Check the battery first.

Good Luck
Steve

Check you ground cable and all ground connections. If they are corrosive or loose this can cause the problem that you state is happening.

I’m happy to help further over the phone at https://www.6ya.com/expert/al_e83b1941f9c0f302

you probably got moisture in your stator or points put a heater on the crank for about an hour or so

If the Master Cylinder BORE size is the same as the bore size required for the caliper you want to replace it with, then YES, you can use your existing Master Cylinder.