I had this relic running pretty good until the other day. All of a sudden, it became difficult to downshift. It's possible I snagged the shifter on a stump or something, but I don't think so. If I had to guess, I would think the selector fork is bent or loose. Holding the lever down disengages the clutch, but it stays in the same gear. If you tap the lever down briskly you can kind of sling it into a lower gear, but it won't downshift using normal technique. Upshift works normally. Oil is pretty fresh, and level is correct. I am hoping some of you guys with old Honda experience might have a handle on this kind of problem.