inside look at 60 novarossi and OS 61 sx-h engine with nelson AAC sleeve and piston
for those who are interested i disassembled a OS 61 sx-h motor that is new and am replacing sleeve and piston with AAC sleeve and piston from Nelson Engines, the sleeve has a 172 degree exhaust duration. I also disassembled my side exhaust C60f Novarossi engine as well. for those who are interested, this engine was manufactured in 2003 per box info included with engine, I have measured carbs on the OS and Novarossi as well
the carbs measure 10 MM for the OS heli engine and 8.5MM for the novarossi
the crank internal diameter for the the Novarossi is .430 the crank has a knife edge cut on counterweight and turbo relief cut as well as a tungsten heavy metal insert for balance