VENTO MOTORCYCLES
Rev no.01/ page 82of 84
Engine runs
poorly in
high-speed
range.
1.
Excessively worn cylinder or piston rings.
2.
Sticky piston ring in grooves.
3.
Spark plug gaps too less.
4.
Ignition not advanced sufficiently due to poorly
working CDI & ignition coil unit.
5.
Defective magneto stator coil.
6.
Float-chamber fuel level too low.
7.
Clogged air cleaner element.
8.
Clogged fuel hose, resulting in inadequate fuel
supply to carburetor.
9.
Clogged fuel cock vacuum pipe.
10.
Weakened valve springs.
11.
Worn camshaft.
12.
Valve Timing out of adjustment.
13.
Too wide spark plug gap.
14.
Defective Ignition coil
15.
Defective Pickup coil or CDI
16.
Too low float chamber fuel level
Replace.
Replace or clean.
Adjust.
Replace.
Replace.
Adjust or replace.
Clean.
Clean and prime.
Clean.
Replace.
Replace.
Adjust.
Adjust.
Replace CDI unit.
Replace.
Adjust.
Dirty or heavy
exhaust
smoke.
1. Too much engine oil in the engine
2. Defective Valve and seals
3. Worn-out valve guide/seals/leaks of valves
4. Weakened valve springs.
5. Worn piston rings or cylinder
6. Worn Valves or stems
7. Worn oil rings side rails
Check with Oil level
gauge, drain excessive
oil
Check & Replace.
Check & Replace.
Replace.
Replace.
Replace.
Replace.
Engine lacks
power.
1. Excessively worn cylinder or piston rings.
2. Sticky piston ring in grooves.
3. Compression leaks from valves & gaskets.
4. Spark plug gaps incorrect.
5. Clogged air cleaner element.
6. Float-chamber fuel level out of adjustment.
7. Fouled spark plug,
8. Sucking air from intake pipe.
9. Slipping or worn V-belt.
10. Damaged/worn rollers in the movable drive face.
11. Weak movable driven face spring.
12. Too rich fuel/air mixture due to defective starter system.
Replace.
Replace.
Replace & repair.
Adjust or replace.
Clean.
Adjust or replace.
Clean.
Clean or replace the
gaskets.
Replace.
Replace.
Replace.
Replace.
Engine over
heats.
1. Heavy carbon deposits on piston crown.
2. Defective oil pump or clogged oil circuit.
3. Fuel level too low in float chamber.
4. Air leakage from intake pipe.
5. Not enough oil in the engine
6. Used incorrect engine oil
Clean.
Replace and clean.
Adjust or replace.
Retighten/replace
gaskets.
Add specified oil.
Change & use specified
Summary of Contents for Phantom R4i
Page 2: ...VENTO MOTORCYCLES Rev no 01 page 2of 84 Phantom R4i Service Maintenance Manual ...
Page 18: ...VENTO MOTORCYCLES Rev no 01 page 18of 84 1 2 3 4 ...
Page 30: ...VENTO MOTORCYCLES Rev no 01 page 30of 84 PISTON INSTALLATION ...
Page 49: ...VENTO MOTORCYCLES Rev no 01 page 49of 84 ...
Page 63: ...VENTO MOTORCYCLES Rev no 01 page 63of 84 ...
Page 66: ...VENTO MOTORCYCLES Rev no 01 page 66of 84 DISC BRAKE CALIPER ASSY ...
Page 67: ...VENTO MOTORCYCLES Rev no 01 page 67of 84 OVERHAULING PROCEDURE OF DISC BRAKE ...
