Compression Pressure Check; Compression Test Procedure - Suzuki Intruder VZR1800 Service Manual

COMPRESSION PRESSURE CHECK

The compression pressure reading of a cylinder is a good indicator of its internal condition.
The decision to overhaul the cylinder is often based on the results of a compression test. Periodic mainte-
nance records kept at your dealership should include compression readings for each maintenance service.
COMPRESSION PRESSURE SPECIFICATION
Standard
1 100 – 1 500 kPa
(11.0 – 15.0 kgf/cm , 156 – 213 psi)
2
Low compression pressure can indicate any of the following conditions:
* Excessively worn cylinder walls
* Worn piston or piston rings
* Piston rings stuck in grooves
* Poor valve seating
* Ruptured or otherwise defective cylinder head gasket
Overhaul the engine in the following cases:
* Compression pressure in one of the cylinders is 800 kPa (8.0 kgf/cm
* The difference in compression pressure between any two cylinders is 200 kPa (2.0 kgf/cm
more.
* All compression pressure readings are below 1 100 kPa (11.0 kgf/cm
800 kPa (8.0 kgf/cm 2

COMPRESSION TEST PROCEDURE

NOTE:
* Before testing the engine for compression pressure, make
sure that the cylinder head nuts are tightened to the specified
torque values and the valves are properly adjusted.
* Have the engine warmed up before testing.
* Make sure that the battery is fully-charged.
Remove the related parts and test the compression pressure in
the following manner.
• Remove the outside spark plugs (#1 & #2). ($2-13 and -14)
• Install the compression gauge and adaptor in the spark plug
hole. Make sure that the connection is tight.
• Keep the throttle grip in the fully opened position.
• Press the starter button and crank the engine for a few sec-
onds. Record the maximum gauge reading as the cylinder
compression.
• Repeat this procedure with the other cylinder.
& 09915-64512: Compression gauge set
09913-10750: Adaptor
(8.0 kgf/cm
, 114 psi) and more.
Limit
800 kPa
, 114 psi)
2
, 114 psi) and less.
2
, 156 psi) even when they measure
2
PERIODIC MAINTENANCE 2-31
Difference
200 kPa
(2.0 kgf/cm , 28 psi)
2
2 , 28 psi) and