Kymco MO KXR 250 Service Manual - chap 15 (ruota post, sps)

15. REAR WHEEL/AXLE/SUSPENSION

15-0

Mongoose/KXR 250

15

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REAR WHEEL/AXLE/SUSPENSION

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SERVICE INFORMATION -------------------------------------------- 15- 2

TROUBLESHOOTING ------------------------------------------------- 15- 3

REAR WHEEL/AXLE/AXLE HUB ----------------------------------- 15- 3

REAR FORK/SWIM ARM/SHOCK ABSORBER -------------------- 15- 12

15

15. REAR WHEEL/AXLE/SUSPENSION

15-1

Mongoose/KXR 250

15. REAR WHEEL/AXLE/SUSPENSION

15-2

Mongoose/KXR 250

SERVICE INFORMATION

GENERAL INSTRUCTIONS

• Jack the machine front wheel off the ground and be careful to prevent the machine from falling

down.

• During servicing, keep oil or grease off the brake disk

• Inspect the brake system before riding.

SPECIFICATIONS

Item

Standard (mm)

Service Limit (mm)

Radialæ2.0

Axialæ2.0

TORQUE VALUES

Rear wheel nut 5.0_ 6.0kgf-m
Rear shock absorber upper mount bolt 3.5_ 4.5kgf-m
Rear shock absorber lower mount bolt 3.5_ 4.5kgf-m
Rear fork axle 6.0_ 8.0kgf-m
Rear wheel hub nut 6.0_ 8.0kgf-m
Rear wheel shaft nut 11.0_ 13.0kgf-m
Caliper holder bolt 1.8_ 2.5kgf-m

SPECIAL TOOLS

Nut wrench F010

TROUBLESHOOTING

Rear wheel wobbling

• Bent rim

• Faulty tire

• Axle not tightened properly

Soft rear shock absorber

• Weak shock absorber spring

• Faulty damper

Rim run out

Rear wheel

15. REAR WHEEL/AXLE/SUSPENSION

15-3

Mongoose/KXR 250

REAR WHEEL/AXLE/AXLE HUB

REMOVAL AND INSPECTION

Place the machine on a level place.
Remove the rear caliper. (Refer to the
“REAR BRAKE CALIPER

REMOVAL” section in chapter 13)

Use the nut wrench to loosen two rear axle
nuts (inner and outer) of the rear axle.

Nut wrench F010

Remove four nuts attaching the rear wheel
hub of the both rear wheels, then remove the
both rear wheels.

Remove the cotter pin and then remove nut.

Remove the rear wheel hub.

Inspect the rear wheel hub.
Cracks/damage _ Replace.

Inspect the rear wheel hub splines.
Wear/damage _ Replace.

Elevate the rear wheels by placing a
suitable stand under the rear of frame.

Support the machine securely so there is
no danger of it falling over.

°Ø

Special

Note that the rear axle nuts are left
threaded.

°Ø

Rear Axle Nuts

Wheel Nuts

Cotter Pin

RearWheel Hub Nut

Rear Wheel Hub

Splines

15. REAR WHEEL/AXLE/SUSPENSION

15-4

Mongoose/KXR 250

Measure the wheel runout.

Service Limit:
Vertical: 2.0 mm
Lateral: 2.0mm

Out of specification _ Replace wheel.

Remove the two rear axle nuts (outer and
inner), washer and collar.

Remove the rear brake disk.

Rear Axle Nuts

Washer

Collar

Rear Brake Disk

15. REAR WHEEL/AXLE/SUSPENSION

15-5

Mongoose/KXR 250

Inspect the brake disk
Cracks/damage _ Replace.
Inspect the brake disk splines.
Wear/damage _ Replace.

Loosen the driven chain (refer to the
“DRIVE CHAIN SLACK
ADJUSTMENT” section in the chapter 3)
and remove the two bolts at the drive
sprocket (refer to the chapter 6), then
disconnect the drive chain from the driven
sprocket.

Remove the rear axle from right side.

Driven Sprocket

Rear Axle

Splines

Tap the axle and with a rubber hammer,

this will avoid damage the axle thread.

°Ø

Bolts

Drive Sprocket Cover

Bolts

Drive Sprocket