From what I can tell it *looks* like the older L77 jug and piston would be the same, but they're rare anyhow. You could downsize it to a 65 cc with the L65 piston and jug, the only difference there is theres less plug angle, but that shouldn't get in the way of any covers, as opposed to the other way around... the 80cc saw is 52x36 mm, and the 65 was 48x36mm