The decision to overhaul the cylinder is often based on the results of a compression test. Periodic maintenance records kept at your dealership should include compression readings for each maintenance service.
Compression pressure specification
Standard | Limit | Difference |
1 100 - 1 500 kPa | 800 kPa | 200 kPa |
(11.0 - 15.0 kgf/cm², 156 - 213 psi) | (8.0 kgf/cm², 114 psi) | (2.0 kgf/cm², 28 psi) |
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/cm², 114 psi) and less.
- The difference in compression pressure between any two cylinders is 200 kPa (2.0 kgf/cm², 28 psi) and more.
- All compression pressure readings are below 1 100 kPa (11.0 kgf/cm², 156 psi) even when they measure 800 kPa (8.0 kgf/cm², 114 psi) and more.
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.
![](https://motoinstruction.ru/img/suzuki/24/129405.jpg)
- Remove the outside spark plugs (#1 & #2). (2-13 and 2-14)
- 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 seconds. Record the maximum gauge reading as the cylinder compression.
- Repeat this procedure with the other cylinder.
09915-64512: Compression gauge set
09913-10750: Adaptor
![](https://motoinstruction.ru/img/suzuki/24/129406.jpg)