Pre electric start 650 engine

[CC1]

I've got a early pre electric start engine what is the interchange years on the piston rings and gasket sets?

 

[gggGary]

70-73 for the most part.
Piston rings by themselves may be hard to find.
From partzilla (not 100% sure the 74 75 used this ring is right.)
This Yamaha 256-11610-00-00 PISTON RING SET STD (STD) Not Available fits the following models and components:

Yamaha Motorcycle 1970 XS1 CRANK & PISTON

Yamaha Motorcycle 1973 TX650 CRANK & PISTON

Yamaha Motorcycle 1971 XS1B CRANK & PISTON

Yamaha Motorcycle 1972 XS2 CRANK & PISTON

Yamaha Motorcycle 1974 TX650A CRANK PISTON TX650A - XS650B - C

Yamaha Motorcycle 1975 XS650B CRANK PISTON TX650A - XS650B - C

Found this on fleaBay
https://www.ebay.com/itm/Yamaha-XS1...STD-Set-of-2-256-11610-00-Repro-/323897504500
And this https://scramblercycle.com/products...ston-ring-set-std-set-of-2-256-11610-00-repro
Those ads say for 256 motors ie 70-73 then also says; fits 74-75 but those years (74-75) are 447 motors. Shrug.
If you go that way would be interesting to hear how they work for you.
Some more info here; https://www.xs650.com/threads/need-help-with-piston-id.42027/
Then this
https://www.cruzinimage.net/2017/09/11/70-73-yamaha-xs1-standard-piston-ring-set-two-piston-rings/
note this set says 70-73