Early Model SV Engines
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Early Model BMW R71: 1938-1941
Tubular steel frame, 22hp 4-stroke horizontal twin, 746cc flathead sidevalve, shaft drive. 3458 units produced,replaced by R-75 in 1941.
IMZ/KMZ M72: 1941-1960
Direct copy of BMW R71; est. 30,000 units built to 1950. Military production only to mid-1950's. Note "Bottlecap" wheel hubs on IMZ models.
Harley Davidson XA: 1942-1943
1,011 est. units. Rare example of HD's flat twin army model and their only attempt at a flat twin since the 1920's W model.
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Early Model KMZ K750: 1959-1963
Introduced swingarm frame 1958, different cylinder head designs from M72. KMZ models with symmetrical wheel hubs.
Dnepr MT12 : 1977-1980 (?)
Last 746cc side-valve motor, 6v electrics. Full-time sidecar wheel drive with 70/30 output to rear and sidecar wheel respectively.
Chang Jiang CJ750: 1957-current
Copy of Russian M-72, 12v electrical alternator on later models. Chinese castings are less finished than Russian, Type 1 engine has oil dipstick at bottom of engine. No toolbox in tank.
From late 1941 to 1943 the Tyumen factory produced a model TMZ-53, also based on the BMW R71 but with a 1000cc SV engine. The gearbox featured 2 ranges of short and long ratio and the sidecar wheel was driven by a differential. The only known surviving example resides in the Moscow Polytechnic Museum, presented here for historical reference.
Side Valve Cylinder Head Patterns: M72 (left), Early K-750 (center), Later K-750 (right)
IMZ/Ural OHV Models
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IMZ M52: 1957-1960
494cc OHV, 24hp, M52K (1957-1958) 26hp, M52C (1957-1964) with 35hp., later with a swingarm frame designated M53.
IMZ M61: 1958-1963
649cc OHV, 28hp. Early models used M72 frames, rear plungers shortened on later models.
IMZ M62: 1961-1965
649cc OHV. Redesigned frame and modified rear plungers; KMZ style rubber block seat mounts replace the earlier spring, rear saddle assembly mounts directly onto fender.
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Ural IMZ M63, M63K and Ural2: 1964-1971
649cc OHV. Swingarm frame; various cosmetic changes including rubber tank band and mud flaps.
Ural IMZ M66, Ural3: 1972-1975
649cc OHV. 32hp. First Ural to use the paper oil filter cartridge, otherwise almost exact from M63.
Ural IMZ M67: 1973-1980+
649cc OHV. First Ural with 12 volt electrics; electric start and redesigned headlamp/ignition switch with seperate speedometer.
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Ural IMZ8: 1983-1990's (IMZ8-xxx-current)
649cc OHV. This is the basic machine carried on into the modern 650 solo and sidecar models with various cosmetic and design options.
Ural 750 (var. models) : 2000-current
745cc OHV., 38.88 hp. ("Retro" model shown). Note the squared cylinder covers. May be solo or w/sidecar, single or 2wd.
Ural Wolf: 2000-current (?)
749cc OHV. First Ural production "chopper" designed in collaboration with Night Wolves MC. Top end est.81mph/130kph.
Ural gearboxes did not have reverse until 1999 (approx.), but did have a hand shifter on the right hand side. When the reverse gear was added you push rearwards to get reverse.
Urals feature roller bearings on the crankshaft.
Ural overhead valve engines come in two sizes, 650cc and 750cc. The earlier 650cc engines have a cast iron barrel bolted directly to the crankcase with studs on the barrel to mount the aluminum head, oval rocker cover with push fit down pipes. Later 750cc engines have a aluminum barrel and head, more rectangular rocker cover. Studs pass through barrel and head.
KMZ/Dnepr OHV Models
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KMZ K650 : (MT8) 1967-1972
649cc OHV., 32 hp. 1st KMZ OHV machine, released to celebrate the 50th Anniversary of the Socialist Revolution. Last KMZ with "crash" gearbox, introduced centrifugal oil cleaner and oil pressure warning switch.
Dnepr MT9: 1971-1976
649cc OHV., 32 hp. Introduced "Dneprglide" gearbox with automatic declutching and reverse gear, later models with square "breadbox" tank. Last OHV model with 6v electrics, K-301 carbs and interchangeable intake/exhaust valves.
Dnepr MT10 : 1974- mid 1980's
649cc OHV., 36 hp. New instrument console, introduced 12volt electrics, heavier brake and clutch levers.
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Dnepr MT11 : mid 1980's-1990's
649cc OHV., 36 hp. Lighter flywheel and larger bolts on final drive, most MT-11s came with bench seat. Late versions had new oil filter.
Dnepr MT16 : mid 1980's-1990's
649cc OHV., 36 hp.70/30 sidecar wheel drive, basically the same as MT-12 (see SV models) but with 650 OHV. Models came with either tractor saddles or bench seat.
Dnepr 8.157 Solo (Dnepr 19): 1991-1996
649cc OHV., 32 hp.70/30 solo model; 18"rims, 9/35 cog ratio in the final drive. Also released as a "chopper" with redesigned exhaust and bars.
Dnepr 650cc OHV engines have a aluminum barrel and head with a rectangular rocker cover, the mounting studs are visible through the barrel fins the exhaust has a screw on mounting fin fitting.
Dnepr gearboxes have a reverse which is push forwards to engage and a declutching device which works when gear lever depressed to engage gears: however some early units came without one or both.
Dneprs have shell bearings on crankshaft.
Later Dneprs used the rectangular "toaster" or "shoebox" tank.
"The new program, which now holds the plant team, rearmament and modernization of production will be reflected on our website." -KMZ Official Website, May 2014
