Actually IDM and Sirio plugs are made by LM, the same company that makes Sirio, Werks, Orion, Invision, etc. engines. IMO, they are the best plugs on the market today, period. Though they are not made for Piccos, they work perfectly in them. That's why IDM engines are Picco based but the plugs are LM. As I said earlier, the IDM versions should be available from Jerry at Shepherd America/XS power, he is the IDM importer.

An od 77t is a hot offroad plug so you could probably use something like a Werks or Orion 5 or 6, readily available from Amain and many other places. I think even Ashford may have them now.

His website is still a little thin but you can email him.
[email protected]