I picked up an OPS Maxi 30. This is a discontinued Italian glow engine. It is really well made and has bearings on the crank pin. It runs 7000 rpm with an APC 20x8 as pictured. It does slightly better with no muffler at all and a larger carb. The larger car does not tune right though. The pitts muffler is actually for a CRRC 40. I made an adapter plate. It is a bit heavy by modern standards but it does run really smooth and start easy. It idles down really low.