VENTO MOTORCYCLES
Rev no.01/ page 46of 84
TESTING PROCEDURE
STEP -1
1 Warming up the engine to normal running
temperature (hot condition).
2 Remove spark plug and connect
compression pressure gauge.
3 Ensure that
(a) Fuel switch/cock is in “OFF”
position.
(b) Ignition switch is in “OFF”position.
4 Accelerate throttle to “FULL” condition &
then kick several times (6 to 8 times).
5 Note down reading, and repeat the above
process three times and calculate their
average value as actual compression pressure.
6 The specified Compression pressure of engine is 10±2Kg/cm
2
.
STEP- 2
When the compression pressure is below 10Kg/cm
2
then refit the spark plug & start and warm up the
Engine again.
@ Remove spark plug and put few drops of engine oil inside the combustion chamber.
@ Connect Compression gauge & repeat above said procedure as explained in STEP-1.
● If the Compression pressure reading increases, then check for following.
a Worn out cylinder.
b Worn out piston / piston rings.
c Scoring / Seizure of cylinder / piston.
d Piston ring jammed in groove.
● If the Compression pressure does not increase then check for following.
a Incorrect Valve / Tappet clearance.
b Improper torque of cam holder nuts or cylinder head bolts.
c Valve seat damage or Valve leakage.
d Valve is bend.
e Improper Valve Timing.
f Cylinder head warp age.
g Blown out cylinder head gasket.
STEP- 3
• Incase compression pressure is more than 12 Kg/Cm2. Then engine requires Decarbonisation of cylinder
head / (combustion chamber) & piston. Also check for smoky exhaust.
STANDARD DIMENSION OF ENGINE
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