The same thing happened to my 93. I don't think the synthetic oil had anything to do with it as I have run syn, 80/90 as well as ATF and all with the same outcome. The plugs generally last only 5-7 years until the "GUM" sets in, so if your buddy made it 20+ years he's money ahead.
I've had pretty good luck with the J&P Cycles stator and it's relatively cheap $65.00. I would also recommend the stator bolt kit or liberally blue loctite the old ones. As for me I always go for new bolts with the "PatchLoc" too many movin parts to be havin your bolts fall out in there. While your at it, pick up a new plug hold down, it's a plastic hunk of crap with a couple of tiny screws, yes blue loctite these as well.
You can buy a larger amp "Kit" for that bike that comes with a new regulator, rotor and stator, but you can't just change the stator to a larger amp.
As far as ignition goes, it all depends on what you want and how deep your pockets are. Go on line or get a J&P catalog or other aftermarket catalog and see what tickles your fancy. There's a lot of stuff out there even for our outcast FXR's
Hope this helps.

 

Sure does help.

 

You can avoid the problem this way, although as someone said, 20 years is good service out of a plug.

When you install the stator, cut the rubber plug off of it; I mean the one that slips into the primary case from the inside.

Lead the two wires out through the hole in the primary. Solder on a couple of extensions of you need to, but if so, do a GOOD, professional job. This is a long-term installation, and you don't want sloppy soldering to interfere with the passage of electrons.

Mount a Deutsch female plug on the end of those two wires from the stator.

Shoot the hole in the case full of silicone sealant - clean it first with acetone. It must be very clean, so's not to leak. You want a good seal from the silicone. If you ever need to, the stuff can be pushed out from one direction or the other.

Cut the plug off the voltage regulator and put the male half of the Deutsch plug on it.

Plug them together, and you're good to go.

Pilgrim

 

old post i know but ...
i just picked up a 94 fxdl ..had 9900 miles but sat for the past 4 yrs or so
i got about 600 miles on it and it did the same as above..plug got oily and semi popped off..dryed with a rag and replugged
it's leaking oil again and did it again..can i pull wires through that block rubber and fix the terminals perminatly or does it have to come apart?

 

You can do it!

You should be able to get a little pull on the wires but not much. On my 1993 FXR I shaved the swelled rubber down with a razor blade, that worked for a few years then eventually I had to solder one wire of the connection together. Of the 2 wire connection only 1 connection was bad so I cut the plug in half,cut the bad half off and stripped the end of the wire for splicing, shaved a bunch more rubber off the case plug, pulled the deteriorated connection out a bit (It didn't come far) and Spliced and soldered the connection (DON'T FORGET TO PUT THE SHRINK TUBE ON BEFORE MAKING THE CONNECTION!). I then applied black RTV to the violated plug surrounding the new connection. This worked great but just after this years Johnstown Pa. "Thunder In The Valley" it was all replaced since my bike needed transmission work and the shop asked if they could replace the stator and voltage regulator instead of dealing with what I had. I said OK.

 

My dealership is telling me my 07 roadkings stator is leaking and should be repalaced, are they trying to pull a fast one on me

 

Pilgrim1s fix is outstanding but I'd use 3M 5200 instead of silicone. Lots tougher to remove but blows away even good silicone for durability.

My dealership is telling me my 07 roadkings stator is leaking and should be repalaced, are they trying to pull a fast one on me

They should explain in electrical terms what precisely was malffunctioning . Regulators and stators die now and then. I replace the regulator whenever I do a stator since a shorted regulator can damage a stator, and 2007 is old enough for a stator failure to be reasonable.