Russian MK 12B

The similarity of the MK 12 b to the Webra series 2 engine shown below is probably no accident 

Different production runs of MK12 b engines 

Design History:- 
Designed and manufactured in Russia in the mid 1960's

Design Features:-
Early versions featured a removable front housing;
later models featured a single piece crankcase;
rear induction; and
crankshaft supported on ball bearings

Specifications:-

Fuel:	Ether/Petroleum/Oil
Cycle:	2T
Data
Cylinders:	1
Displacement:	2,45 cm³
Bore:	15,5 mm
Stroke:	13 mm
Weight and Dimensions
Other Information
Model Year	1980
Manufacturer
U.S.S.R  (C.C.C.P.)
Distributor
U.S.S.R. (C.C.C.P.)

Comments:-

The engine is an example of an early production run (serial number 44) it comes complete with several production flaws and a  lower than average compression, which makes it difficult to hand start. 

 http://youtu.be/69t4qKp6owA