Yamaha Tracer MT09TRA - Service manual > Adjusting the valve clearance

The following procedure applies to all of the valves.

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Valve clearance adjustment should be made on a cold engine, at room temperature.

1. Remove:

• Fuel tank front cover/Front side panel/Front side cowling. Refer to "GENERAL CHASSIS (2)"
• Passenger seat/Rider seat Refer to "GENERAL CHASSIS (1)"
• Fuel tank cover Refer to "GENERAL CHASSIS (3)"
• Fuel tank Refer to "FUEL TANK"
• Air filter case Refer to "GENERAL CHASSIS (3)"
• Air cut-off valve Refer to "AIR INDUCTION SYSTEM"
• Radiator.

  Refer to "RADIATOR"

2. Remove:

• Ignition coils
• Spark plugs
• Cylinder head cover
• Cylinder head cover gasket.

  Refer to "CAMSHAFTS"

3. Remove:

• Timing mark accessing bolt "1"
• Crankshaft end cover "2"

4. Measure:

• Valve clearance. Out of specification → Adjust.

  Valve clearance (cold) Intake 0.11-0.20 mm (0.0043-0.0079 in) Exhaust 0.26-0.30 mm (0.0102-0.0118 in)

a. Turn the crankshaft counterclockwise.

b. When piston #1 is at TDC on the compression stroke, align the TDC mark "a" on the generator rotor with the generator rotor cover mark "b".

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TDC on the compression stroke can be found when the camshaft lobes are turned away from each other.

c. Measure the valve clearance with a thickness gauge "1".

Thickness gauge 90890-03180 Feeler gauge set YU-26900-9

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• If the valve clearance is incorrect, record the measured reading.
• Measure the valve clearance in the following sequence.

Valve clearance measuring sequence Cylinder #1 → #2 → #3

A. Front

d. To measure the valve clearances of the other cylinders, starting with cylinder #1 at TDC, turn the crankshaft counterclockwise as specified in the following table.

B. Degrees that the crankshaft is turned counterclockwise

C. Cylinder

D. Combustion cycle

5. Remove:

• Camshaft

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• Refer to "CAMSHAFTS"
• When removing the timing chain and camshafts, fasten the timing chain with a wire to retrieve it if it falls into the crankcase.

6. Adjust:

• Valve clearance

a. Remove the valve lifter "1" and the valve pad "2" with a valve lapper "3".

Valve lapper 90890-04101 Valve lapping tool YM-A8998

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• Cover the timing chain opening with a rag to prevent the valve pad from falling into the crankcase.
• Make a note of the position of each valve lifter "1" and valve pad "2" so that they can be installed in the correct place.

b. Calculate the difference between the specified valve clearance and the measured valve clearance.

Example:

Specified valve clearance = 0.11-0.20 mm (0.004-0.008 in) Measured valve clearance = 0.25 mm (0.010 in) 0.25 mm (0.010 in)-0.20 mm (0.008 in) = 0.05 mm (0.002 in) c. Check the thickness of the current valve pad.

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The thickness "a" of each valve pad is marked in hundredths of millimeters on the side that touches the valve lifter.

Example: If the valve pad is marked "158", the pad thickness is 1.58 mm (0.062 in).

d. Calculate the sum of the values obtained in steps (b) and (c) to determine the required valve pad thickness and the valve pad number.

Example: 1.58 mm (0.062 in) + 0.05 mm (0.002 in) = 1.63 mm (0.064 in) The valve pad number is 163.

e. Round off the valve pad number according to the following table, and then select the suitable valve pad.

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Refer to the following table for the available valve pads. 

Example: Valve pad number = 163

Rounded value = 165

New valve pad number = 165

f. Install the new valve pad "1" and the valve lifter "2".

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• Lubricate the valve pad with molybdenum disulfide oil.
• Lubricate the valve lifter (Top side) with molybdenum disulfide oil.
• Lubricate the valve lifter (Outer side) with engine oil.
• Install the valve lifter and the valve pad in the correct place.
• The valve lifter must turn smoothly when rotated by hand.

g. Install the exhaust and intake camshafts, timing chain and camshaft caps.

Camshaft cap bolt 10 Nm (1.0 m*kgf, 7.2 ft*lbf)

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• Refer to "CAMSHAFTS"
• 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 specification, repeat all of the valve clearance adjustment steps until the specified clearance is obtained.

7. Install:

• All removed parts

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For installation, reverse the removal procedure.

Checking the engine idling speed

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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 compression.

1. Start the engine and let it warm up for several minutes.

2. Check:

• Engine idling speed Out of specification → Go to next step.

Engine idling speed 1100-1300 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"

a. Connect the Yamaha diagnostic tool.

Use the diagnostic code number "67".

Refer to "SELF-DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE"

b. Check the ISC (idle speed control) leaning value.

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