Most '84's and '85's were up to 30 lbs lighter. The class minimum weight was reduced from 340 lbs to 320 lbs in 1985 (where it is today).

I owned an '84 that weighed 315.

The lighter boats are easily identified by a red hull/deck glue seam.

The boats proved to be fragile at that weight, so the weight started to creep up as Hobie beefed up the structure. In the mid-90's, they refined their manufacturing techniques and were producing boats that were closer to minimum. They are still doing so today.

My 1998 weighs 320 - even going on 8 years old.