I love the tech notes for that CVRX .18 engine - fuel required for vehicles with 5-30% nitromethane and no less than 18% oil content. LoL.
I would buy a Dynamite .19T over the OS. It's cheaper too. The fit and finish may not be the same, but they run and run. If you wear it out, a piston and liner will cost you $50 instead of $82 for the OS.
http://www.rcplanet.com/Dynamite_Mac...FQaOaQodRu8C8A