DISCLAIMER: The modifications described in the following text are for educational purposes only. In no way do I recommend that you apply these modifications to your own motorcycle. If you do choose to go ahead and modify your motorcycle based on the information in this document you will accept all responsibility for your own actions. The author(s) of this document, and host(s) providing it for you, accept no responsibility whatsoever. If you are unqualified to make any of the changes described herein but are bent on doing the modification, seek out a knowledgeable friend or professional mechanic for assistance.

Replacing a chain slider on a Yamaha TTR250

It's a pretty simple operation. Just follow this step by step pictorial guide.

Tools needed:- wheel-nut spanner (24mm), socket set, hammer and drift.

Part needed: Yamaha part number: 10-4GY-22151-00-00 : SEAL, GUARD

The following details refer to fitting a new chain slider using the original length retaining bolt. It is just possible to fit a new slider without disturbing the swing arm but it takes a bit of effort to push the slider into place and requires bending out the bracket holding the sidestand switch to allow room to remove and refit the fixing bolt but, nevertheless, is doable. It will make life easier for a future replacement if a shorter bolt is used!

For ordinary mortals, this is the long way round!

Clear a space and get the bike up on a stand with the back wheel able to spin freely. 

First job is to get the rear wheel out. Next, undo the swing arm nut.

If the swing arm hasn't been out for a while you may need to drift it out with a hammer and drift.

Next undo the bottom shock absorber retailing bolt.

It should now be possible to wriggle the swing arm backwards to allow access to the slider retaining bolt.



Unhook the slider from the chain guard bracket.



The slider can now be removed by pulling it backwards and downwards slightly.



The following photos shows a comparison between the old and new sliders.

The following pics show the damage to the swing arm seal cap which would soon have allowed water into the bearings. This one was caught in time.

Replacements available here
 

Fit the new slider and replace the retaining bolt.

Wriggle the swing arm back into place, replace the swing arm bolt and bottom shock absorber bolt and tighten to the correct torque. Put the rear wheel back in and check everything is OK.

Job done!

Brian Sussex