Mash Dirt Track 650 - Owner's Manual > Drive Chain

Drive Chain Tension

Park the motorcycle on level ground with the main stand and shift the transmission to the neutral position. Check the driving chain tension. Press the chain by hand both up and down to check the range of movement of the lower chain.

Chain Adjustment

Loosen the rear wheel axle nut. Turn the adjusting bolts at the rear of the swing arm until the specified tension is achieved. Use the scale lines on the swing arm to ensure the wheel is straight. Retighten the rear wheel axle nut and check the rear wheel for free rotation and proper alignment between the front and rear wheels.

Caution

The chain adjuster has scale lines on both sides of the swing arm. Ensure the wheel is straight.

Warning

The rear wheel axle nut must be firmly secured to the tightening torque of 50N.m .

Chain/pinion/crown wear check

• Check the condition of the chain; there may not be any damaged rollers, loosened pins or missing O-rings.
• Check the condition of the pinion and crown teeth; if the teeth are as shown in Figure A, they are in good condition, while if they are as shown in Figure B, they are to be replaced

Note*: If worn, the pinion, crown and chain have to be replaced; using a new chain with a worn pinion or crown, the chain will rapidly wear out

Fork functionality check

To check proper functioning of the front fork, operate as follows:

• get on the motorcycle;
• pull the front brake lever and forcefully push the handlebar downwards a few times to check that the fork extends and compresses correctly.
• If you notice oil leaks and jamming, Contact your Genuine Motorcycles dealer for service.

Steering bearing check

Place the motorcycle on a stand in vertical position and secure it so that it cannot overturn.

• Stand in front of the motorcycle.
• Firmly hold the lower part of both fork legs and move the fork forward and backward checking that there is no play

Warning

If you feel any play during the movement, have proper tightening of the steering bearings checked by a Genuine Motorcycles dealer for service.

Removing the front wheel

Position the motorcycle in such a way that the front wheel is lifted from the ground.

• Loosen the bolts 1 holding the wheel axle 2to the front fork mounts.

Caution

Do not operate the front brake lever when the wheel has been removed; this causes the caliper pistons to move outwards. After removal, lay down the wheel with brake. disc on top

Removing the rear wheel

Position the motorcycle in such a way that the rear wheel is lifted from the ground. Unscrew the nut (1) of the wheel pin (2) and remove the latter. Extract the complete rear wheel, keeping the spacers located at the hub sides. For refitting, operate in reverse order from removal fitting the brake disc in the caliper.

• Fit the wheel in the rear fork taking care to correctly fit the brake disc in the caliper.
• Fit the pin (2).
• Screw on the nut (1) without tightening it.
• Tension the chain using the tensioners (3) as described in the relative paragraph.
• Tighten the nut (1) and the nut of the tensioners (3).

Caution

Do not operate the rear brake pedal when the wheel has been removed; this causes the caliper pistons to move outwards. After removal, lay down the wheel with brake disc on top. After reassembly, depress the brake pedal until the pads are against the brake disc.

Rear shock absorber spring preload

The rear shock absorber (1) spring preload can adjusted; to make the adjustment, operate as follows：

 1. Clean rennet and adjusting nut of the spring.

2. Either with a hook wrench or an aluminum punch, loosen the lock ring nut.

3. Turn the adjuster ring nut as required.

4. When the adjusting operation is over (according to your weight and riding style), tighten the lock ring nut. (Torque: 50 N.m).

Warning

Be careful not to touch hot exhaust pipe while adjusting the shock absorber.

Caution

Both rear shock absorbers have to be adjusted in the same way.

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