Print This Page Print This Page

Swingarm Bearings

SAFETY FIRST: Protective gloves and eyewear are recommended at this point.

Note: These instructions are very general, and you should have a service manual for your particular vehicle to get a better understanding of your particular setup and have factory recommended torque levels and specifications on hand.

Check out the Additional Service Information Resources for more information on finding service information for your specific vehicle.

Prep

Thoroughly clean the vehicle to make the job easier and prevent contamination of the new components during installation.

YZ450_2010_0825

Get your swingarm bearing rebuild kit from ALL BALLS RACING.

YZ450_2010_0826

Remove the contents of your ALL BALLS RACING swingarm rebuild kit. Layout the components in an organized manner for easy installation. Note: wait to do this until the old parts are removed and you are ready to begin installing the new components.

YZ450_2010_0855

Remove the plastic wrapper from needle bearings and push it into the inside of the bearing to retain the needles.

Removal

YZ450_2010_0800

Support the back of the frame so the weight of the vehicle is not being supported by the swingarm. Free the swingarm from the frame and linkage.

YZ450_2010_0813

Inspect the frame, linkage, swingarm, and pivot bolts for wear and damage. Pay specific attention to the condition of the chain slider or your swingarm could look like this. Check the swingarm-to-frame and swingarm-to-engine case fitment for excessive play.

Bearing Replacement

Note the component location to aid in reassembly.

YZ450_2010_0815

Remove the side collars.

YZ450_2010_0816

Remove the pivot collars.

YZ450_2010_0818

Remove the outer dust seals.

YZ450_2010_0819

Remove the thrust washers and radial needle bearings.

YZ450_2010_0821

Remove the inner dust seals.

YZ450_2010_0822

Note the location and depth when removing the bearings to help with installation. Press the inner and outer bearings out of the swingarm. Allow room for the bearings to exit the far side of the swingarm.

YZ450_2010_0832

Heating the swingarm around the bearing bores will expand the metal and make removal and installation easier.

YZ450_2010_0823

Clean away all of the old grease, grime, and rust from the bearing bores.

YZ450_2010_0824

Inspect the bearing bores for wear and damage. Make sure the bores are free of damage or burrs that may cause the new bearings to hang during installation.

YZ450_2010_0828

Lubricate the bearings with grease.

YZ450_2010_0829

Apply a light coat of grease to the outside of the outer bearing race for smooth installation.

YZ450_2010_0830

Press the bearings into the swingarm. Install the bearings rounded end first. Use a suitable driver that is slightly smaller than the outside diameter as the bearing.

YZ450_2010_0833

To install the inner bearings it may be necessary to install the  head on the driver after the driver has been inserted through the opposite side bearings.

YZ450_2010_0834

Position the bearings at the proper depth inside the swingarm. In the case of our example, a 2010 Yamaha YZ450F, the outer bearings are required to flush with the outer edge of the bore, and the inner bearings should be 6.5 mm below the inner edge of the swingarm.

YZ450_2010_0831

Make sure the bearings are properly greased.

YZ450_2010_0835

Lubricate the new pivot collar with grease and insert it into the bearings.

YZ450_2010_0836

Lubricate the lips of the dust seals with grease.

YZ450_2010_0837

Install the inner dust seals. Install the dust seals with the markings facing out. Often the dust seals can be gently pressed in by hand. If needed use a suitable driver with the same outside diameter as the seal to to press the seal into the bore.

YZ450_2010_0838

Position the seal as indicated in the service manual. The seals should be flush with the edge our 2010 Yamaha YZ450F.

YZ450_2010_0839

If the bike is equipped with thrust bearings (radial needle bearings) these are replaced by special PTFE washers. Sandwich the PTFE washer between the steel washers. When reassembling the swing arm place the thrust washer assembly so that the PTFE surface faces the outside of the motorcycle.

YZ450_2010_0841

Install the outer dust seals.

YZ450_2010_0842

Install the side collars.

YZ450_2010_0843

Secure the bearing components with zip ties if the rear suspension is not  going to be installed to the vehicle right away.

Installation

YZ450_2010_0800

Apply a light coat of grease to the swingarm and linkage pivot bolts. Install the swingarm to the frame. Take care to properly support the vehicles frame and swingarm so the vehicles weight is not applied to the swingarm until its fasteners are installed.

Return the vehicle to the ground so that its weight is supported by the rear suspension, and tighten the fasteners to the correct torque specifications. Follow any specific instructions in the vehicle’s service manual.

To make your bearings last longer- avoid pressure washing around the bearing seals for extended periods of time. Pressure washers will push water right around seals causing premature rusting of the bearings.

YZ450_2010_0934

INSTALL ALL BALLS RACING STICKER!

Was this information helpful? How can we improve it?

Your email address will not be published. Required fields are marked *