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Okay, what did I get? Points are K&S, marked OEM#1a0-81621-20.  YA RD-400 (76-78). Number seem correct.
Mine is 77 RD400D. Correct points shown in picture. What would these fit?
Gary

Well then, I'm completely out of ideas...

It is crimped on. You have to pry the bottom edge up all the way around. The underside looks really nasty after you crimp it back on ( unless you are more skilled than  I am. Happily it doesn't show. I used bondo to fix the dents in mine - no uncrimping. Satin black paint.

I don't think it was chemical, at all. The ink was hard and a thousandth or so thick. It was squeezed between the cylinder and gasket, just like any other foreign object. We tend to think that ink has almost zero thickness- apparently not so... Bizarre.

Those gaskets look to be brass plated copper.

I've just noticed that the X has faintly printed through to the other side - even weirder. Check it out.

Not sure where the scrapes and scratches came from, been installed since 2009, I think they are original  - Vesrah. The X shaped mark is the impression left from a sharpie "x" I left on the cylinder.  It sounds like these are not candidates for annealling, but copper spray gasket sealer might work?

Pleasantly surprised that jugs can be removed in frame...

Thanks,
Fred

Noticed some oil on top fin of cylinder. Figured gasket was leaking for whatever reason. Pulled head and found this on cylinder side of gasket. What caused this? A small Sharpie X exactly where the mark was. Scraped marker off cylinder with fingernail, so I can't show that. Last time head was off was 10 years ago (3k or so miles) for rings and seals. Don't remember marking the cylinder or why - maybe to keep piston with proper bore... No idea.  Also don't know why I didn't clean it off them. I probably ignored it, thinking it didn't matter. Well, it did!  It didn't leave a deep impression on the gasket - a thousandth or 2, but oil has been seeping very slowly - just a thin stain.  Gaskets ordered.

Quick, stupid question. Engine has to be out to pull the jugs, right? Never tried.

I have no words... other than--blasphemy.

https://www.smartcycleguide.com/L49299771

I just need to ride it more.

I tend to agree, guys. Like I said, overthinking. Was just wondering if the additives break down over time, moisture absorption, etc. We've been told to change the oil in our cars after a year, regardless of mileage.  I'll be draining the tank to change the oil lines - probably use fresh oil to refill the tank anyway... Thanks for the replies.

Fred

Stupid question. '77 RD400 using Yamalube 2S in injector tank. Just bought a string trimmer and the Stihl 2-stroke oil for it claims it has a 3 year shelf life. --NOTE: I AM NOT USING TRIMMER OIL IN MY BIKE!--  I don't put many miles on the RD and the oil may stay in the tank for a year or two. Any problems here? How about opened, but capped partial bottles of the 2S? Am I just overthinking this? Does oil have a shelf life?

Fred

'77 RD400. Been with Progressive since 2010. $75/year. Premium has never increased. Go figure.