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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

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

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