Yamaha ttr230 Service Manual page 61

COMPRESSION PRESSURE MEASUREMENT
2
1
2. Let the engine run for some minutes for
warming up.
3. Turn the engine off.
4. Disconnect:
Spark plug cap
5. Remove:
Spark plug
See Section "SPARK PLUG
INSPECTION".
6. Connect:
Compression meter1
Adapter 2
Compression meter:
90890-03081
Adapter
90890-04082
7. Check:
Compression
************************************
Checking steps:
Start the engine using the start button
(make sure the battery is totally charged)
and with the throttle completely open, until
the meter stabilizes.
V
WARNING
When starting the engine, ground the spark
plug cable in order to prevent sparks.
Compare the readings with the specified
levels (see tables).
3-15
INSP
ADJUS