Picco plugs are for Picco based engines, like JL, Mega ZX and IDM engines (which all Picco based)
Mega MASMO is a Nova Rossi based engine, which if you installed a Picco plug on, it will more likely to leak.

Just remember that Mega engines have 2 lines, one is Mega ZX which is a Picco based engine and one is Mega Masmo which is a Nova Rossi based engine.