Suzuki 2005 GSF1200 Service Manual page 60

1A-2 Engine General Information and Diagnosis:
Condition
Engine noisy (Noise
seems to come from
transmission.)
Engine idle poorly
Engine runs poorly in
high speed range
Engine lacks power
Engine overheats
Dirty or heavy exhaust
smoke
Possible cause
Worn or rubbing gear.
Worn countershaft spline.
Worn driveshaft spline.
Worn or rubbing primary gear.
Worn bearing.
Valve clearance out of adjustment.
Improper valve seating.
Worn valve guide.
Worn rocker arm or rocker arm shaft.
Excessive spark plug gap.
Defective ignition coil.
Defective CKP sensor.
Defective ignitor.
Incorrect float chamber fuel level.
Clogged carburetor jet.
Carburetors not synchronized.
Weak valve spring.
Worn camshaft.
Insufficient spark plug gap.
Mistimed valves.
Ignition not advanced sufficiently due to
poorly working timing advance circuit.
Defective ignition coil.
Defective CKP sensor.
Defective ignitor.
Low float chamber fuel level.
Dirty air cleaner element.
Clogged fuel hose, resulting in
inadequate fuel supply to carburetor.
Insufficient valve clearance.
Weak valve spring.
Mistimed valves.
Worn cylinder.
Worn piston ring.
Improper valve seating.
Fouled spark plug.
Incorrect spark plug.
Clogged carburetor jet.
Incorrect float chamber fuel level.
Dirty air cleaner element.
Loose throttle valve synchronizing
screw.
Air leakage from intake pipe.
Excessive amount of engine oil.
Carbon build-up on piston crown.
Insufficient amount of engine oil.
Defective oil pump.
Clogged oil circuit.
Float chamber fuel level too low.
Air leakage from intake pipe.
Incorrect engine oil.
Excessive amount of engine oil.
Worn cylinder.
Worn piston ring.
Worn valve guide.
Scored or scuffed cylinder wall.
Worn valve stem.
Defective valve stem oil seal.
Worn oil ring side rail.
Correction / Reference Item
Replace.
Replace countershaft.
Replace driveshaft.
Replace.
Replace.
Adjust.
Repair or replace.
Replace.
Replace.
Adjust or replace.
Replace.
Replace.
Replace.
Adjust float height.
Clean.
Synchronize.
Replace.
Replace.
Regap or replace.
Adjust.
Replace ignitor.
Replace.
Replace.
Replace.
Adjust float height.
Clean or replace.
Clean and prime.
Adjust.
Replace.
Adjust.
Rebore or replace.
Replace.
Repair or replace.
Clean or replace.
Replace.
Clean.
Adjust float height.
Clean or replace.
Tighten.
Tighten or replace.
Check level and drain.
Clean.
Check level and add.
Replace.
Clean.
Adjust float height.
Tighten or replace.
Change.
Check level and drain.
Rebore or replace.
Replace.
Replace.
Rebore or replace.
Replace valve.
Replace.
Replace oil ring.