Measuring The Compression Pressure - Yamaha BT1100 2002 Service Manual

MEASURING THE COMPRESSION PRESSURE

1
EAS00065
MEASURING THE COMPRESSION PRES-
SURE
The following procedure applies to all of the cylin-
ders.
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Check:
• valve clearance
Out of specification
Refer to "ADJUSTING THE VALVE CLEAR-
ANCE".
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Disconnect:
• spark plug cap
4. Remove:
• spark plug
CAUTION:
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumulat-
ed in the spark plug wells to prevent it from
falling into the cylinders.
5. Install:
• compression gauge 1
Compression gauge set:
90890-03081
6. Measure:
• compression pressure
Above the maximum pressure
cylinder head, valve surfaces, and piston
crown for carbon deposits.
Below the minimum pressure
drops of oil into the affected cylinder and
measure again.
• Refer to the following table.
3-13
INSP
ADJ
Adjust.
Inspect the
Squirt a few