Yamaha MTN1000 2016, Service Manual

Page: 143 / 658

PERIODIC MAINTENANCE
3-11
mark) of the throttle body that is the stan-
dard. Otherwise, the engine may run roughly
at idle and the throttle bodies may not oper-
ate properly.
TIP
• Turn the bypass air screw using the carburetor
angle driver.
•
After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If a bypass air screw was removed, turn the
screw in fully and be sure to synchronize the
throttle bodies.
• If the throttle body synchronization can not be
adjusted using the bypass air screw, clean or
replace the throttle bodies.
•
The difference in vacuum pressure between
the throttle bodies should not exceed 1.33 kPa
(10 mmHg).
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Stop the engine and remove the measuring
equipment.
3. Install:
• Caps
4. Install:
•
Air filter case
Refer to “GENERAL CHASSIS (3)” on page
4-20.
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
• Fuel tank cover
Refer to “GENERAL CHASSIS (2)” on page
4-13.
•
Air scoop stay/Air scoop
• Rider seat
Refer to “GENERAL CHASSIS (1)” on page
4-1.
5. Adjust:
•
Throttle grip free play
Refer to “CHECKING THE THROTTLE
GRIP” on page 3-33.
EAS31318
CHECKING THE THROTTLE BODY JOINTS
1. Remove:
• Throttle bodies
Refer to “THROTTLE BODIES” on page 7-5.
2. Check:
• Throttle body joints “1”
Cracks/damage

Replace.
3. Install:
• Throttle bodies
Refer to “THROTTLE BODIES” on page 7-5.
EAS30625
CHECKING THE EXHAUST SYSTEM
1. Check:
•
Exhaust pipe “1”
• Exhaust chamber “2”
•
Muffler “3”
Cracks/damage

Replace.
•
Gasket “4”
Exhaust gas leaks

Replace.
2. Check:
Tightening torque
•
Exhaust pipe nut “5”
•
Exhaust pipe joint bolt “6”
•
Exhaust chamber bolt “7”
• Muffler bolt “8”
•
Muffler joint bolt “9”
Carburetor angle driver 2
90890-03173
1
Throttle grip free play
3.0–5.0 mm (0.12–0.20 in)
1