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Removing and Disassembling the Crankcase

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Written by Randy Fox   
Saturday, 03 November 2007

Splitting the Cases

Now that the engine is out of the frame, remove and store the three M8 bolts and three M6 bolts from the right-hand side. Then rest the engine on its right-side.

Tip: I used a furniture dolly on which to rest the engine’s right-side. It gave the shafts enough room so the case would lie flat, and let me easily move the whole thing around the garage, as needed. See overhead photo below.

 

Engine case, Yamaha Road Star

 

Next, remove and store the 15, M6 bolts from the left side. Tip: Be sure you get the long one that is recessed, near the rear of the engine, in the shift-shaft area, away from the case perimeter.

Rotate the transmission's shift-selector drum, as needed, so it lines up with the puzzle-piece shaped hole in the left case. See the service manual for details.

Now begin carefully working the case halves apart. There is one place inside that will resist a bit. It is the crossover-tube, in the lower front area of the case. See photo below. The resistance comes from a small O-ring, and is not strong, so just keep working the cases apart. You can use wooden or plastic wedges as you go, but be very careful not to mar the mating (gasket) surfaces.

 

Engine crank case, Yamaha Road Star

 

Once the cases are separated, you'll see that the parts inside are organized into four basic areas. See photo above. From front to rear, and top to bottom, they are:

  • The generator shaft and gear
  • The crank assembly
  • The transmission
  • The oil pump

 
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