GUIDE: Replacing a GS125 Chain & Sprokets.

[richie....]

Probably the same for most 125's. Anyways, I dont this on my GS125. took about and hour and I only used the most basic of tools.

First up... the old.

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0173.jpg

This chain was well past it.....

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0172.jpg

That is a gap between the chain and sprocket.

So, order your chain, check its the right on for your model. I payed just under £33 delivered for mine off ebay.

next... remove the front sprocket cover...

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0175.jpg

Sit on the bike with your foot down on the rear brake (or get someone else too) and undo the front nut (be carefull!)

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0177.jpg

Then undo the spindle nuts and the pully things that pull the wheel to tension the chain...

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0179.jpg


Then move to the rear and undo the linkage for the brake and brake cable...

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0186.jpg

Push the wheel as far forward as it will go, then Remove the Front sprocket...

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0178.jpg

Keep all your nuts and bolts safe in a tub, i used the box from the chain kit...

now full undo the nuts on the rear wheels and tap out the spindle with a hammer..

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0180.jpg

The wheel should now be free. Take the chain off the rear sprocket, and take it off completely.

To remove the Chain, just cut it off with a grinder, or, undo the split like (push the open end with some needle nose plyers, then it will come apart)

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0197.jpg

Right, all removed. Now my sprocket came off on the hub like so...

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0187.jpg

Use a little WD40 on the nuts, give it 5 and crack off, i used a vice to hold the sprocket while undoing the nuts, just make sure there are no open draws below that the bolt can fall into and spend 20 minutes looking for

you should now be left with these, the old components...

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0191.jpg

Now, to do it all, just put on the new sprockets, and go back from last, to first steps in this guide. Undo the wheel tensioners so they can slide all the way forward and do up as needs be before you nip the spindle up completely.

to put the front cog back on, put it on, put the lock washer back on, and hand tighten the nut on, put it all back together, inc the chain, then tighten up with the rear brake on.

https://i19.photobucket.com/albums/b181/r05_ltd/IMAG0199.jpg

Jobs a good 'un.

If there is anything ive missed, let me know. I have tried to write this as best as can but if you need help, speak up. I am a total novice and i managed this in about an hour. Please check everything is safe a tight, go slow while testing it. I cant be held responsible if you hurt yourself following this guide, to be honest, its fairly strait forward.

thank you!

[dodgydog]

Couple of things.

Easier to loosen the rear sprocket nuts while it's still on the bike. (Without access to a vice you could end up having to reassemble it to loosen them)

Also careful knocking the rear spindle out, easy to damage the threads unless you use soft faced hammer or a block of wood.


Dog

(I know of these things through painful experience)
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[richie....]

i tried

[Vincent]

[pepperami]

10 out of 10
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