Suzuki GSX-R 1000 Service Manual: Throttle valve synchronization
Check and adjust the throttle valve synchronization
among four cylinders.
- Start the engine and run it in idling condition
for
warming up.
- Stop the warmed-up engine.
- Lift and support the fuel tank. Refer to “fuel
tank
removal and installation” in section 1g (page 1g-
9).
- Remove the clamps (1).

- Disconnect the respective vacuum hoses (2) from
vacuum nipples on the throttle body.
- Disconnect the iap sensor coupler (3).

- Connect the respective vacuum tester hoses (4) to
the vacuum nipples.

- Set up the sds tool. (Refer to the sds operation
manual for further details.)
- Start the engine.
- Click “data monitor”.
- Warm up the engine (engine coolant temp. More
than 80 °c (176 °f)).

- Click “active control”.
- Click “isc air volume control” (5).

- Click “on” button (6) to fix the isc air volume of four cylinders.
Note
when making this synchronization, be sure that the engine coolant
temperature is within 80 – 100 °c
(176 – 212 °f). |

- Engine speed: approx 1 150 rpm
- Isc valve position: approx 48 step
|
- Check for the synchronization of vacuum from #1 to
#4 cylinders.

- Equalize the vacuum of the cylinders by turning each
air screw (7) and keep it running at idling speed.
Note
always set the engine rpm at idle rpm. |

- If the adjustment is not yet correct, remove each air
screw and clean them with a spray-type carburetor
cleaner and blow dry with a compressed air. Also,
clean the air screw passageways.
Note
- slowly turn the air screw clockwise and
count the number of turns until the screw
is lightly seated.
- Make a note of how many turns were made
so the screw can be reset correctly after
cleaning.
|
- Repeat the procedures from 9) to 16).
- Close the sds tool and turn the ignition switch off.
- Disconnect the vacuum tester and reinstall the
removed parts.
- After completing the throttle valve synchronization, clear the dtc and
reset the isc learned value using sds tool. Refer to “isc valve preset and
opening initialization” in section 1c .
Visually inspect the isc valve if necessary.
Inspect the isc valve for any carbon deposition
defects. Clean or replace the isc valve if necessary.
...
When removing or replacing the throttle body assembly,
reset the isc valve learned value in the following
procedures:
turn the ignition switch on position.
Set up the sds tools. (Refer t ...
Other materials:
Special tools and equipment
Recommended service material
Note
required service material is also described in the following.
“Handlebar components” “steering components” “steering
damper construction”
Special tool
...
Transmission removal
Remove the engine assembly from the frame. Refer to “engine assembly
removal” in section 1d .
Remove the engine top side. Refer to “engine top side disassembly” in
section 1d .
Separate the upper and lower crankcases. Refer to “engine bottom side
disassembly” in section 1 ...
Windshield cleaning
Clean the windshield with soft
cloth and warm water with mild
detergent. If scratched, polish
with a commercially available
plastic polish. Replace the windshield
if it becomes scratched or
discolored so as to obstruct view.
When replacing the windshield,
use suzuki replacement windshield. ...