Thread: War time hacks
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Old 12-02-2011, 11:58 AM   #46
gspell68
Beastly Adventurer
 
Joined: May 2008
Location: Georgia (The State, not the Country)
Oddometer: 2,891
Just to clear up a few errors and throw out some other other facts:
1) The R-71 was a 750cc bike (someone said a 600cc) that was the grandfather of M-72's and CJ-750's (not the R-75 as someone said).
2) The R-71 was never used by the German military (except in minor, non-tactical, homeland defense roles in the same way US Army would use a Ford Econoline van!). Plus, ever notice that the KS-750's frame is one big piece of stamped steel and the R-75's frame is a bunch of bolt-joined sections?!?!? Welding technology was in it's infancy and the tubular steel frame was still not up to off-road rigors (The Germans knew this when they gave the plans to the Soviets, but the Rooskies welded in gussets at the weak joints). Plus, the Army was already heavily vested in flexible steel framed R-12 whose drive parts weren't really interchangeable with the R-71. The R-71 was already obsolete during it's production and was the last flathead BMW ever designed!!! Olny about 3,500 were ever made.
3) The KS-750 and R-75 weren't designed concurrently. Zundapp (who probably copied theirs from the Gnome & Rhone AX2 design or that other Belgian factory I can't remember right now) rolled out their rig well before BMW even had an R-75 assembly line. The Germans wanted BMW to start producing the Zundapp design, but BMW insisted they could make their own version in a timely manner. The R-75 was the first motorcycle with hydraulic brakes.
4) The K-750 from the KMZ (later Dnepr) factory in Kiev, Ukraine was merely a suspension improvement of the R-71/M-72's plunger frame to cope with harsh Russian terrain and had nothing in common with the German rigs. The rear swingarm remained the same on every Dnepr bike until the factory closed. The front leading link fork design flopped though. The engine had a few minor upgrades that boosted it up by a whopping 4hp over the M-72! Yeehaw!!! In the 1960's Dnepr came out with a gearbox that had a reverse and an awesome auto-clutching feature. They also had 2WD versions, but as I understand, there was little in common with the German design. Later the Dnepr 2WD was full-time, not a locking diff like the Ural, Zundapp, or BMW.
5) No post-war KS-750's or R-75's were made probably because the factories were destroyed and there were Allied enforced displacement restrictions on motorcycles. I read that there were about 100 civilian model R-75's made in 1948 from leftover parts, though.
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1959 KMZ (Dnepr) K-750 (Happy now?!?!?)
1962 KMZ (Dnepr) K-750M
1959 IMZ (Ural) M-72M

gspell68 screwed with this post 12-02-2011 at 12:03 PM
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