I checked the correct coil and made sure it is pumping out some resistance. It's reading 1.7Ohm with the points open. All the wires going to and from the source coil are connected, clean, and appear correct.

Later I will put a new ignition coil, wire, and spark plug cap on it and see how it goes.

I'm upset to say, but I think all of this may have been due to a spark plug issue. 

new conundrum...

why would it be killing spark plugs?

I'm using ngk's b9es gapped correctly. I have eliminated the oil pump, running 32:1 mix. stock carb jetting with airscrew turned about 2.5 turns out, stock airbox and exhaust. 

1st plug died after 30min of light testing to dial in the carb.
2nd plug died after 1hr of hard riding.

Here is a picture of how the last two plugs came out. Again, they would randomly spark, but only intermittently. A few times I could feel some juice through the boot as well, but no spark. 


 

Possibly counterfeit plugs? 

Besides that, back when I was racing I learned to never use a new NGK plug before a race...  I would have a box of "pre ran" plugs because so often an NGK would fail quickly.  I think sometimes there's a bad batch or something?  I switched to Autolite and... knock wood...  never had one prematurely fail. 

Unfortunately the non-resistor plugs these bikes use are going the way of the do-do bird...

Enduronut likes the ND (Nippondenso) plugs.

My experience with Champion is worse than NGK...  I could get Champion plugs free...  but even their high end "G" plugs failed a lot.

it's possible, I got all the NGK's from the same small mc shop in my small town. It looks like the Autolite 4054's are a replacement, i'll see about ordering a few. 

If you'd put a pic of the plug up first that would've rung a bell straight away. It takes very little to oil up a B9. It's not the plugs fault but it'll run with an oily mix while new & clean but when the oil gets attached to the insulator like it has then its goodbye spark straight to earth. If you had a plug tester like we had at work that can test them under about 120psi where you look in a window you can watch it shorting down the carbony oil to earth at the base of the insulator. Then we'd give it a sand blast & pick any sand out that wouldn't blow out & away ya go again. If you had a little gas torch to heat up & dry out that baked on stuff you'd be good to go, but only until you got too far to walk home unless the motor is running clean & lean. Maybe not lean but not rich either. I have many plugs oiled like that but don't have a plug cleaner any more. I just use [call it a hot plug] for testing, just an old N12Y out of my car, then when running clean & if i'm heading down the farm for a blast i swap it to the 9 or whatever. That is why early twostroke road racers like TD2--250cc would run them up till hot on hot plugs before going out on the track then swap to very cold plugs & hope they didn't oil foul before the first corner. Forgotten where i'm going with this haha--nowhere. Put a hot plug--anything ngk 5 or 6 to run it in the shed. It aint gonna melt up at shed speed. I've had some lucky escapes doing that & then forget i have a hot plug & race of down the road without issue but my luck will run out for sure. I now tie a note to the bars.
My writing style changes again, don't know why, maybe after so many lines of type, always does it.

Thanks rt325, I always appreciate the knowledge. In your opinion should I be good with the autolite 4054's?

My buddy who the bike is for plans on racing it in some vintage races. So heck, I could tell him to just put a new plug in before each race just to be sure it doesn't die in the middle of the woods.

Sorry better ask MarkT [now i read back on his post]. I've never seen or used an Autolite sorry. I'm stuck on NGK but did end up with some real race type Champion old stock plugs numbers N59G & 62G i think without looking. Not much porcelane in the 62 & not much more in the 59 but my motor was good & dry not oily so kept running all day. In my [bucket racing] miniature road racing my 100 i used an NGK that had a short top & simply called 11. Came out of my boys NSR250 roadracer & was especily short by the looks so the front wheel wouldnt rub it under braking. Sorry long story--first line is relevant haha. I'm of to mow a meadow & saw firewood.
Editing again-- if ya buddy is racing it, it'll be getting a good work out so idealy your 9 should be safe once the oil deposit is cleaned off & should run all day providing the motor is free to rev & not drowning rich or blocked exhaust. I'm a bit of a fan of NGK plugs.

Autolite 4054 =ngk b8es non resistor Amazon has them for $5.43 for a 4 pack I’m going to try them because I to have some go bad lately and I bought mine at a M/C shop Thanks for the tip MarkT 

I went looking for 2054 without luck. Did you mean 4054 = NGK B8ES I see we can get them here so might have to give them a try.

great catch. There are those pesky numbers again getting shuffled around in my head! haha. yes, Autolite 4054 is the correct cross reference. 

I just ordered 4 from napa online and they'll be delivered to my local store in a couple days.