OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines Damaged 550 Pro - repair or part out?

While Max's method would be the best, I'd just drill out to the right rivet size and use a sealed blind rivet with a smear of JB weld. The bit protruding in the transfer port should have negligible effect on flow (after all we're not building a race engine).
Rotate the piston to TDC and stuff a rag in the bore to catch and filings when you drill the hole.

If it doesn't work, nothing lost, just put a $10 motor on it or part it out., just make sure you use a sealed blind rivet as they're designed to be water tight.