Disassembly (Exhaust Components)

EXHAUST SYSTEM

The exhaust system is composed of exhaust pipes, an exhaust chamber/turbocharger assembly, and mufflers. The turbocharger is operated by the engine's expelled gases and this in turn operates the compressor rotor, which creates the boost pressure for the combustion chambers. The boost pressure is controlled by a wastegate that channels unneeded exhaust out the right hand muffler. See the block diagram below.

The turbocharging system features a patented Yamaha exhaust joint chamber. The exhaust pipes are grouped together to supply an even exhaust flow - a 360'^interval with less interference from exhaust pulses. As a result, the engine gives a smooth, ever-increasing curve of performance.

EXHAUST SYSTEM REMOVAL

CAUTION:

Do not, under any circumstances, disassemble the turbocharger unit itself. If the turbo-charger unit fails, it must be replaced.

NOTE: Removing the left muffler, turbine rotation can be inspected without removing the turbo-charger.

A-VIEW

DISASSEMBLY

Exhaust Pipe and Exhaust Chamber

1. Remove the lower, fairing panel that shields the turbocharger/exhaust chamber assembly.

NOTE: The lower fairing panel need not be removed; however disassembling the exhaust pipes and exhaust chamber will be easier,

2. Remove the exhaust pipe mounting flange nuts.

3. Loosen the clamps that mount the exhaust chamber to the exhaust pipes.

4.    Remove the exhaust pipes.

5.    Remove the nuts at the exhaust chamber /turbocharger mounting flange, and remove the exhaust chamber.

Mufflers

1. Remove the left muffler mounting bracket bolts.

2. While supporting the left muffler, loosen the coupling bolt and nuts at the turbocharger, and remove the left muffler.

3. Remove the right muffler mounting flange bolt.

4. While supporting the muffler, remove the mounting flange bolts that connect the muffler to the turbocharger, and remove the muffler.

Turbocharger

1. Loosen the clamp screws.

1. Duct to surge tank

1. Duct from air cleaner

2.    Remove the scavenging oil hose.

NOTE: Using a suitable clamp or bolt, close off the oil hose so that oil will not leak out.

3. Remove the banjo fitting bolt from the oil supply hose.

4. While supporting the turbocharger, remove the mounting nuts, and remove the turbocharger.

CAUTION: Don't allow foreign particles to enter the turbocharger, when removing the turbo-charger.