Suzuki GS500E (1989-1997) [202/221] Finding ref 15

Suzuki GS500E (1989-1997) [202/221] Finding ref 15
2 Poor running at low speeds (continued)
-
Poor acceleration 0 Engine oil viscosity too high. Using a heavier oil than that
recommended in Chapter 1 can damage the 011 pump or
0 Carburettors leaking or dirty. Overhaul the carburettors (Chapter 3). lubrication system and cause drag on the engine.
0 Timing not advancing. Faulty pick-up coils or ignitOf' unit (Chapter 4). 0 Brakes dragging. UsuaHy caused by debris which has entered the
0 Cartxnttors not synchronised. Adjust them with a vacuum gauge brake piston seals, or from a warped disc or bent axle. Repair as
set or manometer (Chapter 1). necessary (Chapter 6).
3 Poor running or no power at high speed
-
FIring incorrect 0 Piston ring-to-groove clearance excessive. This is caused by
0 Air filter restricted. Clean or replace filter (Chapter 1). excessive wear of the piston ring lands. PIston replacement is
0 Spark plugs fouled, defective or worn out (Chapter 1). nec:essary (Chapter 2).
0 Spark plug cap or HT wiring defective (Chapters 1 and 4). 0 Cylinder head ~et damaged"If the head is ~Iowed to become
0 Spark lug caps not making contact. Make sure they are property loose, or.if excessIVe carbon build-up on ~he piston CfO';Nn and
con~ed combustion chamber causes extremely high compresSIon, the
0 Incon'ect spark plugs. Wrong type, heat range or cap head .gasket may leak. Retorquing the head is not al~ays
configuration. Check and install correct plugs (Chapter 1). sufficient to restore the seal, so gasket replacement IS necessary
0 Ignition control unit defective (Chapter 4). (Ch.apter 2). ,
0 Pulse generator coils defective (Chapter 4). 0 Cytlnder head warped. This IS caused by overheating or
0 Ignition HT coils defective (Chapter 4). improperly tightened head bolts. Machine shop resurfacing or
head replacement is necessary (Chapter 2).
FueValr mixture Incorrect 0 Valve spring broken or weak. Caused by component failure or
0 Air bleed holes clogged. Remove carburettor and blow out all wear; the springs must be replaced (Chapter 2).
passages (Chapter 3). 0 Valve not seating properly. This is caused by a bent valve (from
0 Air filter clogged, poorly sealed or missing (Chapter 1). over-rewing or improper valve adjustment), burned valve or seat
0 Air filter housing poor1y sealed. Look for cracks, holes or loose Qmproper carburation) or an accumulation of carbon deposits on
clamps and replace or repair defective parts (Chapter 3), the seat (from carburation or lubrication problems). The valves
0 Fueilevel too high or too low. Check the float height (Chapter 3). must be cleaned and/or replaced and the seats serviced if
0 Carburettor intake manifolds loose. Check for cracks, breaks, possible (Chapter 2).
tears or loose clamps. Replace the rubber intake manifold joints if
split or perished (Chapter 3), Knocklng or plnglng
0 Jet needle incorrectly positioned or wom Check and adjust or
replace (Chapter 3). 0 Carbon build-up in combustion chamber. Use of a fuel additive
0 Main jet clogged. Dirt, water or other contaminants can clog the that will dissolve the adhesive bonding the carbon particles to the
main jets, Clean the fuel tap filter, the in-line filter, the float crown and chamber is the easiest way to remove the build-up.
chamber area, and the jets and carburettor orifices (Chapter 3). Otherwise, the cylinder head will have to be removed and
D Main jet wrong size. The standard jetting is for sea level decarbonized (Chapter 2).
atmospheric pressure and oxygen content. Check jet size 0 Incorrect or poor quality fuel. Old or improper grades of fuel can
(Chapter 3). cause detonation. This causes the piston to rattle, thus the
0 Throttle shaft-to-carburettor body clearance excessive. Overhaul knocking or pinglng sound. Drain old fuel and always use the
carburettors, reJ)iacing worn parts or complete carburettor if recommended fuel grade (Chapter 3).
necessary (Chapter 3), 0 Spark plug heat range incorrect. Uncontrolled detonation indicates
. the plug heat range is too hot. The plug in effect becomes a glow
CompressIon /ow plug, raising cylinder temperatures. Install the proper heat range
0 Spark plugs loose, Remove the plugs and inspect their threads. plug (Chapter 1).
Reinstall and tighten to the specified torque (Chapter 1). 0 Improper air/fuel mixture. This will cause the cylinder to run hot,
0 Cylinder head not sufficiently tightened down. If the cylinder head which leads to detonation. Clogged jets or an air leak can cause
is suspected of being loose, then there's a chance that the gasket this imbalance (Chapter 3).
or head is damaged if the problem has persisted for any length of
time. The head bolts shooki be tightened to the proper torque in ..,
"the correct sequence (Chapter 2). ...,sce ,aneous causes
D Improper valve clearance. This means that the valve is not closing 0 Throttle valve doesn't open fully. Adjust the throttle grip freeplay
completely and compression pressure is leaking past the valve. (Chapter 1).
Check and adjust the valve clearances (Chapter 1). 0 Clutch slipping. May be caused by loose or wom clutch
0 Cytinder and/or piston wom. Excessive wear will cause components. Overhaul clutch (Chapter 2).
compression pressure to leak past the rings. This is usually 0 Timing not advancing. Ignition control unit faulty (Chapter 4).
accompanied by wom rings as well. A top-end overhaul is D Engine oil viscosity too high. Using a heavier 011 than the one
necessary (Chapter 2). recommended in Chapter 1 can damage the oil pump or
0 Piston rings wom, weak, broken, or sticking. Broken or sticking lubrication system and cause drag on the engine.
piston rings usually indicate a lubrication or carburation problem 0 Brakes dragging. Usually caused by debris which has entered the
that causes excess carbon deposits or seizures to form on the brake piston seals, or from a warped disc or bent axle. Repair as
pistons and rings. Top-end overhaul is necessary (Chapter 2). necessary.
Fault Finding REF-15

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