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Old 07-12-2012, 12:05 PM   #1236
Beastly Adventurer
Joined: May 2008
Location: Georgia (The State, not the Country)
Oddometer: 3,583
it has an air powered valve that when you let up on the throttle partially closes off the exhaust pipe which causes the exhaust to back up into the engine thereby increasing the resistance to the pistons as the crankshaft rotates
Backpressure on a Ural crankshaft sounds like a recipe for disaster!
I don't know how well the 750 cranks are built and if they'd stand up to a Jake brake, but I'm pretty sure if you tried that on a 650, you could afterwards remove the crank through the drainplug!!!
1959 KMZ (Dnepr) K-750 (Happy now?!?!?)
1962 KMZ (Dnepr) K-750M
1959 IMZ (Ural) M-72M
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