Checking The Engine Idling Speed; Synchronizing The Throttle Bodies - Yamaha MT-09 2021 Service Manual

TIP
• Lubricate the valve pad with molybdenum di-
sulfide oil.
• Lubricate the valve lifter (Top side) with molyb-
denum disulfide oil.
• Lubricate the valve lifter (Outer side) with en-
gine oil.
• Install the valve lifter and the valve pad in the
correct place.
• The valve lifter must turn smoothly when rotat-
ed by hand.
g. Install the exhaust and intake camshafts,
timing chain and camshaft caps.
Camshaft cap bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
TIP
• Refer to "CAMSHAFTS" on page 5-16.
• Lubricate the camshaft lobes and camshaft
journals.
• First, install the exhaust camshaft.
• Align the camshafts marks with the camshaft
cap marks.
• Turn the crankshaft counterclockwise several
full turns to seat the parts.
h. Measure the valve clearance again.
i. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance ad-
justment steps until the specified clearance
is obtained.
7. Install:
• All removed parts
TIP
For installation, reverse the removal procedure.
EAS31017

CHECKING THE ENGINE IDLING SPEED

TIP
Prior to checking the engine idling speed, the
throttle body synchronization should be adjusted
properly, the air filter element should be clean,
and the engine should have adequate compres-
sion.
1. Start the engine and let it warm up for several
minutes.
2. Check:
• Engine idling speed
Out of specification → Go to next step.
PERIODIC MAINTENANCE
Engine idling speed
1200–1400 r/min
3. Check:
• ISC (idle speed control) learning value
"00" or "01" → Check the intake system.
"02" → Clean the throttle bodies.
Refer to "CHECKING AND CLEANING THE
THROTTLE BODIES" on page 7-7.
a. Connect the YDT.
Use the diagnostic code number "67".
Refer to "DIAGNOSTIC CODE: SENSOR
OPERATION TABLE" on page 9-76.
b. Check the ISC (idle speed control) leaning
value.
EAS30797

SYNCHRONIZING THE THROTTLE BODIES

TIP
Before synchronizing the throttle bodies, check
the following items:
• Valve clearance
• Spark plug
• Air filter element
• Throttle body joint
• Fuel hose
• Exhaust system
• Breather hose
Checking the throttle body synchronization
1. Stand the vehicle on a level surface.
TIP
Place the vehicle on a maintenance stand.
2. Remove:
• Rider seat
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
• Fuel tank center cover
Refer to "GENERAL CHASSIS (1)" on
page 4-1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air filter case
Refer to "GENERAL CHASSIS (2)" on
page 4-10.
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