Measuring The Compression Pressure - Yamaha Sirius T110LSE Service Manual

MEASURING THE COMPRESSION PRESSURE

EAS00067
MEASURING THE COMPRESSION
PRESSURE
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
9valve clearance
Out of specification → Adjust
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:
9spark plug cap
4. Remove:
9spark plug
cC
Before removing the spark plug, use com-
pressed air to blow away any dirt accumulat-
ed in the spark plug well to prevent it from
falling into the cylinder.
5. Install:
9compression gauge 1
1
6. Measure:
9compression pressure
Out of specification → Refer to steps (c)
and (d).
3-13
CHK
ADJ
Compression gauge
90890-03081
Compression pressure
(at sea level)
Minimum
1,130 kPa (11.3 kg/cm
Standard
1,300 kPa (13.0 kg/cm
Maximum
1,460 kPa (14.6 kg/cm
2 , 161 psi)
2 , 185 psi)
, 208 psi)
2