Yamaha XV1700PCRC Service Manual page 163

MEASURING THE COMPRESSION PRESSURE
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
d. Carbon deposits → Eliminate.
e. If the compression pressure is below the
minimum specification, pour a teaspoonful
of engine oil into the spark plug bore and
measure again.
Refer to the following table.
Compression pressure
(with oil applied into the cylinder)
Reading
Higher than
without oil
Same as without
oil
L LLL L LLL L L LLL L
10.Install:
• spark plug
11.Connect:
• spark plug cap
12.Remove:
• camshaft sprocket cover
Refer to "ROCKER ARMS, PUSH RODS
AND VALVE LIFTERS" in chapter 5.
13.Install:
• decompression solenoid
Refer to "CAMSHAFTS" in chapter 5.
• camshaft sprocket cover
Refer to "ROCKER ARMS, PUSH RODS
AND VALVE LIFTERS" in chapter 5.
14.Install:
• silencer air filter case
Refer to "SILENCER AIR FILTER CASE".
• air filter case
Refer to "AIR FILTER CASE".
• fuel tank
Refer to "FUEL TANK".
• seat
Refer to "SEAT AND SIDE COVERS".
3 - 25
CHK
ADJ
Diagnosis
Piston ring(s) wear
or damage →
Repair.
Piston, valves, cyl-
inder head gasket
or piston possibly
defective → Repair.
L LLL L L LLL L L LLL L LLL
18 Nm (1.8 m • kg, 13 ft • lb)