Piston ring -MALOSSI MHR- 47.0mm - cylinder -MALOSSI 75 cc BIG DEPS Ø47mm, 4-bolt - Piaggio Ciao, BRavo, Grillo, Boss, SI

Piston rings are wear and tear parts of every engine. At least when the compression is down and you feel the power no longer coming in, the rings should be replaced.