Suzuki GSX1400 Service Manual page 311

8-6 SERVICING INFORMATION
Complaint
Noisy engine.
Engine runs poorly
in high speed range.
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Symptom and possible causes
Excessive valve chatter
1. Too large valve clearance.
2. Weakened or broken valve springs.
3. Worn tappet or cam surface.
4. Worn and burnt camshaft journal.
Noise seems to come from piston
1. Worn down pistons or cylinders.
2. Fouled with carbon combustion chambers.
3. Worn piston pins or piston pin bore.
4. Worn piston rings or ring grooves.
Noise seems to come from timing chain
1. Stretched chain.
2. Worn sprockets.
3. Not working tension adjuster.
Noise seems to come from clutch
1. Worn splines of countershaft or hub.
2. Worn teeth of clutch plates.
3. Distorted clutch plates, driven and drive.
4. Worn clutch release bearing.
5. Weakened clutch dampers.
Noise seems to come from crankshaft
1. Due to wear rattling bearings.
2. Worn and burnt big-end bearings.
3. Worn and burnt journal bearings.
4. Too large thrust clearance.
Noise seems to come from balancer
1. Worn and burnt journal bearings.
Noise seems to come from transmission
1. Worn or rubbing gears.
2. Worn splines.
3. Worn or rubbing primary gears.
4. Worn bearings.
Defective engine internal/electrical parts
1. Weakened valve springs.
2. Worn camshafts.
3. Valve timing out of adjustment.
4. Too narrow spark plug gaps.
5. Ignition not advanced sufficiently due to poorly
working timing advance circuit.
6. Defective ignition coil.
7. Defective crankshaft position sensor.
8. Defective ECM.
9. Clogged air cleaner element.
10. Clogged fuel hose, resulting in inadequate fuel
supply to injector.
11. Defective fuel pump.
12. Defective throttle position sensor.
13. Defective STP sensor or STV actuator
Remedy
Adjust.
Replace.
Replace.
Replace.
Replace.
Clean.
Replace.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Replace.
Replace.
Replace.
Replace the primary
driven gear.
Replace.
Replace.
Replace.
Replace thrust bearing.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Replace.
Adjust.
Adjust.
Replace ECM.
Replace.
Replace.
Replace.
Clean.
Clean and prime.
Replace.
Replace.
Replace.