MVVS is an acronym for:

MVVS was created during communist rule to provide a research opportunity and to keep up with model airplane engine development in the "capitalist" countries. MVVS has been producing high power model engines since 1952. These engines powered many winners in world-wide competitions e.g. in the F2A, F2C, F3D categories.
Every engine is delivered with an instruction sheet and exploded view of all spare parts. The manufacturer of the engines provides a complete after-sale service and two years warranty on faulty materials. (three years or 1000 starts on gas engines)
Well manufactured, the glow engines use the ABC piston-liner system, two ball bearings, a twin needle carburetor with needle valve and idle needle. Every engine is delivered with instructions in English. Engines are delivered in the configuration GFS, that is with the exhaust on the right-hand side. The design of the engine allows for either side or rear exhaust; this is changed simply by turning the cylinder; eight screws to undo! However, the choice must be made before the very first start of the engine.
Unless otherwise stated, MVVS Engines are delivered without muffler, to provide the customer the option to choose.
If you need lower RPM operation, check out the larger engines of 8cc and upward. These engines are designed with low RPM operation in mind, to help you keep flight noise down and save flight sites. It is not easy to design low-speed glow engines. The MVVS top notch Control-Line experience pays off here.