My Metro 6/1 is from that same time frame, same importer, in it's original crate. Casting sand and heavy black grease mixture, a big gob under the piston crown, don't forget to look for it, you have to remove the crank from the piston to see it. An FU message from Rajkot, I guess. The only other non-standard problem was a misbored conrod that had to be replaced. Most of the standard problems were present. These warrant a full scale tear down, but mine is providing good service now. I'm sure their are plenty of surprises in all product labels from Rajkot.
The Metro's are splash lube only, no lower sump for settling, so I added a big door gravity feed bypass filter.