I think I saw one of those from an old " Lost in Space" episode   

RT,    Thanks for your replies.  I'm going to respond to you and Mark separatly, since you both brought up a number of items. 

I'm looking forward to winter ending soon here in Syracuse NY cuz I have plans to make a video to document the performance issue I had last year. I'm not going to try to describe it cuz my memory of it has faded a bit (old age).  Look for another posting from me in a few weeks.

I can say that I have covered the carb, the oring thoroughly.   And the exhaust.
The coil testing you did at work sounds interesting, but I don't have access to such a tester.
I like the cool Yamaha tester you pictured; I've only seen that once before, maybe it was yours. 

I'm going to jump over to replying to MarkT and wrap up my current thoughts....
 

Mark,

Thanks for your reply.   No, you're not confused:  I did in fact mention the 7mm gap test, which I read in the Clymer book, but the OEM manual was vague on what the test entails, so I edited that remark out of my post.   
But I did do the test according to Clymer, simply pulling the high tension lead off the plug and holding it 7mm from the cylinder head, and kicking. It did bridge the gap with a blue-white spark which was moderatly bright.

When I check the spark at the spark plug (kicking) held against the cylinder, the spark is bright at first, but becomes a bit less intense as I kick and kick, and it gets a bit irratic in intensity   I have checked the points condition and gap.

With my other vintage bikes I have always simply replaced the condensers at the beginning, since they sometimes degrade over time, and they are inexpensive.  So, I ordered a condenser and a flywheel puller for this bike yesterday.
 
I am inclined to replace this DT3 coil for the same reason (they sometimes bench test OK, but underperform on the road)  like I have routinely done on my other bikes  but  Yamaha doesn't make them, and I'm disinclined to spend a bunch of money unnecessarily.    This EMGO universal coil  www.amazon.com/Emgo-Universal-Ignition-Coil/dp/B002EC389W     was recommended by  Makotosun  back in 2016, currently an inexpensive  $18 plus shipping.  However, I'm wary of "Universal" parts, and no resistance values are offerred. 

What do you think of the EMGO coil?

BTW, as I mentioned to RT,  I'm planning on doing another thread when winter breaks here in Syracuse. I'll describe the performance issue and post a video.

I've probably posted this dozens of times:  yamaha-enduros.com/index.php/forums/74-7...ignition-coil#120526

I've had good luck with the Emgo, others have too...  looks like the one you posted.  If I had to buy a new coil other than original I would go with the Emgo. 

On "meter readings"...  unless a coil has a open circuit or a short, I don't worry about the specs too much.  The ET magneto Yamaha used is pretty robust and tends to work well with different ignition coils.  Why I'm saying that is if you expect the Emgo to match the OEM specs, you're likely to be disappointed. I have a new spare Emgo I keep handy "just in case" and if you want me to measure the specs I can do it this afternoon.

Thanks Mark 

I looked up the EMGO coil you mentioned in that thread you gave me. Here it is:  www.amazon.com/Emgo-24-71532-Ignition-Coil/dp/B00230959C
Looks just like the one I mentioned, just a different color.

Yes, I'm curious about the resistance readings (even if they are not esssentially important), so if you had a minute to test your new EMGO that would be appreciated.  And if you would check which EMGO  item number it is.

EDIT: I just found that Dennis Kirk indicates " 1.0 ohm " for the EMGO 2471532
www.denniskirk.com/emgo/universal-igniti...01280.prd/201280.sku

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