Yamaha Tracer MT09TRA - Service manual > Chain drive

Removing the drive chain

1. Stand the vehicle on a level surface.

WARNING

Securely support the vehicle so that there is no danger of it falling over.

TIP

Place the vehicle on the centerstand so that the rear wheel is elevated.

2. Straighten the drive sprocket nut rib "a".

3. Remove:

• Drive chain

NOTICE

Be sure to put on safety goggles when working.

TIP

Cut the drive chain with the drive chain cut & rivet tool.

Drive chain cut & rivet tool 90890-01550

Drive chain cut & rivet tool YM-01550

Checking the drive chain

1. Measure:

15-link section "a" of the drive chain Out of specification → Replace the drive chain.

15-link length limit 239.3 mm (9.42 in)

a. Measure the length "b" between the inner sides of the pins and the length "c" between the outer sides of the pins on a 15-link section of the drive chain as shown in the illustration.

b. Calculate the length "a" of the 15-link section of the drive chain using the following formula.

Drive chain 15-link section length "a" = (length "b" between pin inner sides + length "c" between pin outer sides)/2

TIP

• When measuring a 15-link section of the drive chain, make sure that the drive chain is taut.
• Perform this procedure 2-3 times, at a different location each time.

2. Check:

• Drive chain

Stiffness → Clean and lubricate or replace.

3. Clean:

• Drive chain

a. Wipe the drive chain with a clean cloth.

b. Put the drive chain in kerosene and remove any remaining dirt.

c. Remove the drive chain from the kerosene and completely dry it.

NOTICE

• This vehicle has a drive chain with small rubber O-rings "1" between the drive chain side plates. Never use high-pressure water or air, steam, gasoline, certain solvents (e.g., benzine), or a coarse brush to clean the drive chain. High-pressure methods could force dirt or water into the drive chain's internals, and solvents will deteriorate the O-rings. A coarse brush can also damage the O-rings. Therefore, use only kerosene to clean the drive chain.
• Do not soak the drive chain in kerosene for more than ten minutes, otherwise the Orings can be damaged.

4. Check:

• O-rings "1" Damage → Replace the drive chain.
• Drive chain rollers "2" Damage/wear → Replace the drive chain.
• Drive chain side plates "3" Damage/wear/cracks → Replace the drive chain.

5. Lubricate:

• Drive chain

Recommended lubricant Chain lubricant suitable for Oring chains

Checking the drive sprocket

1. Check:

Drive sprocket.

More than 1/4 tooth "a" wear → Replace the drive sprocket, the rear wheel sprocket and the drive chain as a set.

Bent teeth → Replace the drive sprocket, the rear wheel sprocket and the drive chain as a set.

b. Correct

1. Drive chain roller

2. Drive sprocket

Checking the rear wheel sprocket

Refer to "CHECKING AND REPLACING THE REAR WHEEL SPROCKET"

Checking the rear wheel drive hub

Refer to "CHECKING THE REAR WHEEL DRIVE HUB"

Installing the drive chain

1. Install:

• Drive chain

NOTICE

Be sure to put on safety goggles when working.

TIP

Install the drive chain joint with the drive chain cut & rivet tool.

Drive chain cut & rivet tool 90890-01550

Drive chain cut & rivet tool YM-01550

a. When press fitting the connecting plate "1", make sure the space "a" between the end of the connecting pin "2" and the connecting plate is 1.2-1.4 mm (0.05-0.06 in).

b. After riveting, make sure the diameter between the edges "b" of the connecting pin "2" is 5.5-5.8 mm (0.22-0.23 in).

c. After riveting, make sure the space "c", which is inside of the connecting link "3" and inside of the connecting plate "1", is 14.1-14.3 mm (0.56-0.65 in).

2. Lubricate:

• Drive chain

Recommended lubricant Chain lubricant suitable for Oring chains

3. Install:

• Drive sprocket
• Washer "1"
• Drive sprocket nut "2"

Drive sprocket nut 95 Nm (9.5 m*kgf, 69 ft*lbf)

TIP

• While applying the rear brake, tighten the drive sprocket nut.
• Install washer "1" with the "OUT" mark "a" facing out.
• Stake the drive sprocket nut "2" at cutouts "b" in the drive axle.

4. Install:

• Shift arm "1"

TIP

Before installing, make sure to align the mark "a" of the shift shaft with the punch mark "b" of the shift arm.

Shift arm bolt 14 Nm (1.4 m*kgf, 10 ft*lbf)

5. Adjust:

Drive chain slack Refer to "ADJUSTING THE DRIVE CHAIN SLACK"

Drive chain slack 5.0-15.0 mm (0.20-0.59 in)

NOTICE

A drive chain that is too tight will overload the engine and other vital parts, and one that is too loose can skip and damage the swingarm or cause an accident. Therefore, keep the drive chain slack within the specified limits.

See also: