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Kawasaki Vulcan 2000 Motorcycle Tech Briefing

Kawasaki breaks the two-liter barrier with an entirely new motorcycle. Read on for a look at its innards. By Art Friedman.
By Art Friedman
2000 Kawasaki Vulcan Right Side View.Jpeg
Action photography by Kevin... 
   
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2000 Kawasaki Vulcan Right Side View.Jpeg
Action photography by Kevin Wing.
2000 Kawasaki Vulcan Engine Cutaway View.Jpeg
At 2053cc, the VN2000 is currently... 
   
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2000 Kawasaki Vulcan Engine Cutaway View.Jpeg
At 2053cc, the VN2000 is currently the world's largest proprietary motorcycle motor, at least until Triumph's 2294cc Rocket III triple arrives this spring. Then it will have to settle for the "Largest V-Twin" title. It breathes through airboxes on both side of the engine. Oil level is checked via the dipstick, which must be screwed in with the bike upright.
2000 Kawasaki Vulcan Engine View.Jpeg
The left side of the engine,... 
   
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2000 Kawasaki Vulcan Engine View.Jpeg
The left side of the engine, with its chromed external oil lines, mimics the right side's pushrod tubes. Primary drive is via a big, quiet chain on the left side.
Kaw2053 Tech Cylphoto Lg.Jpeg
The cylinders use durable... 
   
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Kaw2053 Tech Cylphoto Lg.Jpeg
The cylinders use durable nickel-silicon liners. The heads and the top 25 percent of the cylinders are liquid cooled. The lower cylinders are air-cooled.
Kaw2053 Tech Crank Lg.Jpeg
The rods are placed side-by-side... 
   
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Kaw2053 Tech Crank Lg.Jpeg
The rods are placed side-by-side on a single crankpin, which gives the classic exhaust cadence of a big V-twin. The exhaust note is deep and full.
Kaw2053 Tech Crank2 Lg.Jpeg
The huge crankshaft has massive... 
   
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Kaw2053 Tech Crank2 Lg.Jpeg
The huge crankshaft has massive 220mm flywheels to give plenty of engine inertia (flywheel effect). There is no back-torque limiter, but we don't miss it.
Kaw2053 Tech Caser Lg.Jpeg
The case for crankshaft and... 
   
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Kaw2053 Tech Caser Lg.Jpeg
The case for crankshaft and gearbox are one unit. The crankcase is dry sump, with the oil stored on the rear section of the case and fed under pressure.
Kaw2053 Tech Casel Lg.Jpeg
The right case with bearings... 
   
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Kaw2053 Tech Casel Lg.Jpeg
The right case with bearings for (L to R) front balancer, crank, rear balancer, and three transmission shafts. Cams are on the other side of this case.
Kaw2053 Tech Valves Lg.Jpeg
Pushrods operate the 40mm... 
   
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Kaw2053 Tech Valves Lg.Jpeg
Pushrods operate the 40mm intake and 30mm exhuast valves. Pushrod actuation was chosen to keep engine height down to just 2mm taller than Kawasaki's 1600.
Kaw2053 Tech Rockers Lg.Jpeg
The four pushrods are actuated... 
   
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Kaw2053 Tech Rockers Lg.Jpeg
The four pushrods are actuated by two cams. Each pushrod operates that cylinder's pair of intake or exhaust valves through these rocker shafts.
Kaw2053 Tech Rocker Lg.Jpeg
Each rocker shaft contains... 
   
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Kaw2053 Tech Rocker Lg.Jpeg
Each rocker shaft contains a pair of small hydraulic lash adjusters, one for each valve the shaft's rockers operate, so no valve lash adjustment is ever needed.
Kaw2053 Tech Engr Lg.Jpeg
Though they were used to help... 
   
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Kaw2053 Tech Engr Lg.Jpeg
Though they were used to help reduce engine height and center of mass, pushrods have a styling attraction and work well with a low-rpm engine like this one.
Kaw2053 Tech Piston Lg.Jpeg
The 103mm-wide forged piston's... 
   
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Kaw2053 Tech Piston Lg.Jpeg
The 103mm-wide forged piston's slipper design helps to reduce friction. The top is flat except for the four valve pockets. Compression ratio is a stout 9.5:1.
Kaw2053 Tech Rods Lg.Jpeg
Lightweight steel rods help... 
   
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Kaw2053 Tech Rods Lg.Jpeg
Lightweight steel rods help reduce vibration. The stroke is a long 123.2mm. The undersquare bore/stroke meshes well with the torquey intent.
Kaw2053 Tech Efinoz Lg.Jpeg
The EFI uses fine-atomizing... 
   
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Kaw2053 Tech Efinoz Lg.Jpeg
The EFI uses fine-atomizing injectors, which create a finer (70 microns versus 120 microns) fuel mist, and sub-throttles to attenuate throttle changes.
Kaw2053 Tech EFI Lg.Jpeg
The two huge 46mm thottle... 
   
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Kaw2053 Tech EFI Lg.Jpeg
The two huge 46mm thottle bodies are backed up by sub-throttles, which are controlled by the ECU to maintain intake velocity at an acceptable speed.
Kaw2053 Tech Decompress Lg.Jpeg
During starting, the engine... 
   
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Kaw2053 Tech Decompress Lg.Jpeg
During starting, the engine control unit (ECU) activates this solenoid, which lifts the exhaust valves slightly to make the big twin easier to crank over rapidly.
Kaw2053 Tech Balancers Lg.Jpeg
To get the sound of a single-crankpin... 
   
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Kaw2053 Tech Balancers Lg.Jpeg
To get the sound of a single-crankpin V-twin without shaking you to bits, Kawasaki uses counterbalancers plus rubber mounts for the front of the engine.
Kaw2053 Tech Balancers2 Lg.Jpeg
Instead of using gear drive,... 
   
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Kaw2053 Tech Balancers2 Lg.Jpeg
Instead of using gear drive, the 2000 turns its balancers with an automatically tensioned Hyvo chain. The bearings above the crank carry the two camshafts.
Kaw2053 Tech Oilpumps Lg.Jpeg
The 4.9-quart semi-dry-sump... 
   
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Kaw2053 Tech Oilpumps Lg.Jpeg
The 4.9-quart semi-dry-sump lubrication system carries oil back with thetransmission and scavenges it away from the crankcase to reduce power losses.
Kaw2053 Tech Oilpumps3 Lg.Jpeg
Three pumps manage the oil.... 
   
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Kaw2053 Tech Oilpumps3 Lg.Jpeg
Three pumps manage the oil. The unit at top right scavenges the crankcase. The middle on scavenges the transmission, and the lower left one pressure feeds oil.
Kaw2053 Tech Damper Lg.Jpeg
The Hyvo primary-drive chain... 
   
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Kaw2053 Tech Damper Lg.Jpeg
The Hyvo primary-drive chain is quieter than gears. That damper assembly on the end of the crankshaft smoothes out the power pulses of the big twin.
Kaw2053 Tech Belt Lg.Jpeg
Kawasaki pioneed toothed-belt... 
   
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Kaw2053 Tech Belt Lg.Jpeg
Kawasaki pioneed toothed-belt drive on its 305 and 440cc bikes back in the '70s. It is light, quiet, low-maintenance, and cheaper than shaft drive.
2000 Kawasaki Vulcan Left Side View Driving.Jpeg
Responsive steering, good... 
   
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2000 Kawasaki Vulcan Left Side View Driving.Jpeg
Responsive steering, good brakes and reasonable clearance made the VN2000 more fun than we expected on twisty roads.
Kaw2053 Tech Frame Lg.Jpeg
Forged sections at the steering... 
   
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Kaw2053 Tech Frame Lg.Jpeg
Forged sections at the steering head and swingarm pivot areas, the strong triangulated swingarm, and 49mm inner fork tubes give the chassis a rigidity you can feel on the road. Steering-head angle is 32 degrees. A small steering offset keeps steering light.
Kaw2053 Tech Shock Lg.Jpeg
To adjust the single damper's... 
   
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Kaw2053 Tech Shock Lg.Jpeg
To adjust the single damper's rebound or preload, you must unlock the right side panel, pull a lanyard to release the passenger-pillion latch, and 2 bolts for the main seat. Offsetting the shock gives room for the battery and other components on the left.
2000 Kawasaki Vulcan Headlight View.Jpeg
The three small reflector... 
   
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2000 Kawasaki Vulcan Headlight View.Jpeg
The three small reflector beams in the top of the big 7.3-inch-wide headlight are on at all times and function as the low beam. Switching to high beam adds the beam in the bottom of the headlight unit to the mix. High or low, the headlight is better than most.

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