Yamaha XV19SW 2006, Service Manual

Page: 93 / 145

ENGINE
3-4
EAS20470
ENGINE
EAS20530
ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
NOTE:
• The valve clearance is automatically adjusted
by the hydraulic valve lifter. However, there are
times when the valve clearance needs to be
adjusted manually. If this is the case, adjust the
clearance of the two maladjusted or worn
valves using the adjusting screw on the rocker
arm.
If clearance is on the slip side “1”, loosen the
adjusting screw and bring the valve clearance
“a” within specification. Check if the valve
clearance “b” on the adjusting screw “2” side is
within specification.
If clearance is on the adjusting screw “2” side,
tighten the adjusting screw and bring the valve
clearance “b” within specification.
• Valve clearance adjustment should be made
on a cold engine, at room temperature.
• When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
1. Remove:
• Rider seat
• Rider seat bracket assembly
Refer to “GENERAL CHASSIS” on page 4-1.
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
• Air filter case
Refer to “GENERAL CHASSIS” on page 4-1.
• Muffler
• Exhaust pipes
Refer to “ENGINE REMOVAL” on page 5-1.
2. Disconnect:
• Spark plug caps
3. Remove:
• Spark plugs
4. Remove:
• Shift pedal assembly “1”
5. Remove:
• Damper cover “1”
• Damper “2”
• Timing mark accessing screw “3”
• Crankshaft end screw “4”
6. Remove:
• Camshaft sprocket cover “1”
7. Remove:
• Wire harness guide bolt “1”
1
3
4
2
1
1