If they appear damaged or deteriorated, replace them.

Balancer Adjustment
Torque LimiterSubthrottle Sensor Output Voltage Inspection
Measure the output voltage at the subthrottle sensor in
the same way as input voltage inspection, note the following.
Disconnect the subthrottle sensor connector and connect
the setting adapter [A] between these connectors.
Special Tool - Throttle Sensor Setting Adapter: 57001
-1538
...
Muffler Body Installation
Replace the muffler body gasket [A] with a new one.
Install the muffler body gasket to the premuffler chamber
[B] until it is bottomed so that the chamfer side faces premuffler
chamber.
Install the muffler body clamp [C] as shown in the figure.
Insert the projection [D] into the slot [ ...
For Secondary Fuel Injectors
Remove the fuel tank (see Fuel Tank Removal).
Disconnect the secondary fuel injector connector [A].
Connect a digitalmeter to the terminals in each secondary
fuel injector [A].
Measure the secondary fuel injector resistance.
Secondary Fuel Injector Resistance
Standard: Abo ...