1
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GENERAL INFORMATION
1-24
VENOX250/250i
POOR PERFORMANCE (ENGINE LACKS POWER)
Clogged air cleaner
Poor fuel flow (Restricted)
Clogged fuel tank cap breather hole
Clogged exhaust muffler
Carburetor fuel level too low
Clogged carburetor high speed fuel
passage
Faulty CDI unit
Faulty A.C. generator
Improper valve clearance
adjustment
Excessively worn valve seat
(protruded valve stem)
Improper valve and seat contact
Worn cylinder and piston rings
Leaking cylinder head gasket
Improper valve timing
Clean and unclog
Fouled spark plug
Incorrect heat range plug
Oil level too high
Oil level too low
Oil not changed
Clogged oil line
Faulty oil pump
Worn cylinder and piston rings
Mixture too lean
Poor quality fuel
Excessive carbon buildup in
combustion chamber
Ignition timing too advanced
Excessive carbon build-up in
combustion chamber
Poor quality fuel
Clutch slipping
Mixture too lean
Ignition timing too advanced
Inspection/Adjustment
Symptom
Engine speed
increases
Correct
Engine speed does not
increase sufficiently
Incorrect
Rapidly accelerate or run
at high speed
Start engine and accelerate
lightly for observation
Test cylinder compression
Check carburetor for
clogging
Check ignition timing
(using a timing light)
Check valve clearance
Correct
Incorrect
Normal
compression
Low compression
Remove spark plug and
inspect
Check crankcase for oil
level and condition
Check for engine overheating
Engine overheats
Engine does not
overheats
Plug not fouled or
discolored
Plug fouled or
discolored
Correct and not
contaminated
Incorrect or
contaminated
Valve train lubricated
properly
Valve train not
lubricated properly
Engine knocks
Engine does not knock
Not clogged
Clogged
Check cylinder head for
oil lubrication
Probable Cause
Summary of Contents for Venox 250
Page 1: ......
Page 2: ...SERVICE MANUAL Overseas Sales Division Overseas Service Department...
Page 24: ...1 GENERAL INFORMATION 1 18 VENOX250 250i Throttle Cable Radiator Ignition Coil...
Page 26: ...1 GENERAL INFORMATION 1 20 VENOX250 250i Fuse Battery Starter Relay Horn...
Page 54: ...3 LUBRICATION SYSTEM 3 0 VENOX250 250i 3 LUBRICATION SYSTEM...
Page 61: ...4 FUEL SYSTEM 4 0 VENOX250 250i VENOX 250 CARB 4...
Page 78: ...6 CYLINDER HEAD VALVES 6 0 VENOX250 250i 6 VENOX 250 1 0 1 4kg m 1 0 1 4kg m...
Page 79: ...6 CYLINDER HEAD VALVES 6 1 VENOX250 250i VENOX 250 i...
Page 90: ...7 CRANKSHAFT PISTON CYLINDER 7 0 VENOX250 250i 7 2 4kg m 2 4kg m...
Page 101: ...8 GENERATOR LEFT CRANK CASE COVER 8 0 VENOX250 250i 8 VENOX 250 0 8 1 2kg 7 5 8 5kg VENOX 250i...
Page 106: ...9 CLUTCH GEAR SHIFT MECHANISM 9 0 VENOX250 250i 9 0 8 1 2kg 5 5 6 5kg 7 5 8 5kg 1 8 2 5kg...
Page 115: ...10 TRANSMISSION SYSTEM 10 0 VENOX250 250i 10...
Page 127: ...11 COOLING SYSTEM 11 0 VENOX250 250i SCHEMATIC DRAWING 0 8 1 2kg m...
Page 151: ...12 FRONT WHEEL SUSPENSION STEERING 12 13 VENOX250 250i...
Page 163: ...14 HYDRAULIC BRAKE 14 0 VENOX250 250i 14 2 4 3 0kg 3 0 4 0kg 0 8 1 2kg...
Page 175: ...15 IGNITION SYSTEM 15 1 VENOX250 250i CDI Battery Ignition Switch Pulser Coil Ignition Coil...
Page 182: ...16 CHARGING SYSTEM 16 1 VENOX250 250i REG REC Ignition Switch ACG...
Page 205: ...19 AFI AUTOMATIC FUELINJECTION 19 1 VENOX250 250i VENOX 250i AFI...
Page 206: ...19 AFI AUTOMATIC FUELINJECTION 19 2 VENOX250 250i SYSTEM DIAGRAM...
Page 224: ...19 AFI AUTOMATIC FUELINJECTION 19 20 VENOX250 250i PAGE 05 PAGE 04 PAGE 06 PAGE 03...
Page 225: ...19 AFI AUTOMATIC FUELINJECTION 19 21 VENOX250 250i PAGE 07 PAGE 08 PAGE 10 PAGE 09...