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1. GENERAL INFORMATION GRAND DINK 125/150
ENGINE LACKS POWER
Inspection/Adjustment Symptom Probable Cause
Start engine and
accelerate lightly for Clogged air cleaner
Restricted fuel flow
observation Clogged fuel line between fuel
Engine speed Engine speed does tank and carburetor
increases not increase Clogged exhaust muffler
sufficiently Faulty auto bystarter
Check ignition timing Split carburetor vacuum piston
(using a timing light) diaphragm
Correct timing Incorrect timing Faulty CDI unit
Faulty A.C. generator
Check valve clearance
Improper valve clearance
Correct Incorrect adjustment
Worn valve seat (valve stem too
protruding
Test cylinder compression
Improper valve and seat contact
Normal Abnormal Worn cylinder and piston rings
compression compression Blown cylinder head gasket
Flaws in cylinder head
Check carburetor for Improper valve timing
clogging
Not Clogged Clogged Clogged carburetor jets
Remove spark plug and
inspect
Plug not fouled or Plug fouled or Fouled spark plug
discolored discolored Incorrect heat range plug
Remove oil dipstick and
check oil level and condition
Oil level too high
Correct and not Incorrect or Oil level too low
contaminated contaminated Oil not changed
Remove cylinder head oil
pipe bolt and inspect
Valve train lubricated Valve train not Clogged oil pipe
properly lubricated properly Faulty oil pump
Insufficient coolant
Check if engine overheats Faulty thermostat
Worn cylinder and piston rings
Mixture too lean
Engine does not Engine overheats Poor quality fuel
overheats Excessive carbon buildup in
combustion chamber
Ignition timing too early
Rapidly accelerate or run Air in cooling system
at high speed
Excessive carbon build-up in
combustion chamber
Engine does not knock Engine knocks Poor quality fuel
Clutch slipping
Mixture too lean
Ignition timing too early
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