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).
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- Disconnect the respective vacuum hoses (2) from
vacuum nipples on the throttle body.
- Disconnect the iap sensor coupler (3).
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- Connect the respective vacuum tester hoses (4) to
the vacuum nipples.
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- 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)).
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- Click “active control”.
- Click “isc air volume control” (5).
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- 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). |
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- Engine speed: approx 1 150 rpm
- Isc valve position: approx 48 step
|
- Check for the synchronization of vacuum from #1 to
#4 cylinders.
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- 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. |
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- 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:
Water hose inspection
Inspect the water hoses in the following procedures:
remove the side cowlings. Refer to “exterior parts
removal and installation” in section 9d (page 9d-
6).
Check the water hoses for crack, damage or engine
coolant leakage. If any defect is found, replace the
water hose wi ...
Rear shock absorber inspection
Refer to “rear shock absorber removal and installation” .
Shock absorber
Inspect the rear shock absorber for damage and oil
leakage, and absorber bushing for wear and damage. If
any defect is found, replace the rear shock absorber with
a new one.
Caution
do not attempt to disassemble ...
Cushion rod inspection
Refer to “cushion rod removal and installation” .
Collar and spacer
Remove the collar and spacer from the cushion rod.
Inspect the collar and spacer for any flaws or other
damage. If any defects are found, replace it with a
new one.
Cushion rod bearing
Insert the collar a ...