Note:
- Before testing the engine for compression pressure, make sure that the cylinder head bolts are tightened to the specified torque values and valves are properly adjusted.
- Have the engine warmed up by idling before testing.
- Be sure that the battery used is in fully-charged condition.
Remove the parts concerned and test the compression pressure in the following manner.
- Remove the radiator. (5-4)
- Remove all the spark plugs. (2-6)
- Fit the compression gauge in one of the plug holes, while taking care of the tight connection.
- Keep the throttle grip in full-open position.
- While cranking the engine a few seconds with the starter, and record the maximum gauge reading as the compression of that cylinder.
- Repeat this procedure with an other cylinder.
- 09915-64510: Compression gauge
- 09913-10750: Adaptor