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This is an overview on how to remove the rear sprocket on a wr250r to change the gear ratio. I started with a 12 tooth front and 48 ...
First step is to lift the bike using a buddy or brute force. Place a sturdy block or bucket under subframe. ( Or use a motorcycle lift if ...
Next remove axle nut and remove axle.
Now remove the adjuster blocks. First you loosen the lock nut, which is a twelve millimeter on this particular bike. You loosen this up and the same thing ...
Remove the drive sprocket. Depending on your bike you may need to open the peened part of the nut to remove.
Install new sprocket on output shaft. Also it is a good idea to use thread lock.
Place a piece or cardboard or towel on floor, and rest tire on floor. Using a number twelve wrench and allen wrench,remove bolts on sprocket.
Depending on the size of your sprocket choice & length of chain, you might need to add a link to your chain. In this case I replaced the ...
Before re-assembly, make sure to compress rear brake caliper pistons to allow the rotor to fit back in the caliper. Using an old brake pad or piece of ...
Once the new sprockets and chain are reinstalled, align rear wheel and reinstall axle.
Now it is time for chain adjustment. This is a very important step and you must use the revised procedure from Yamaha
At this step tighten up axle nut and check for tight spotss in your chain. If you don't have any, it is good. If you feel binding re-adjust. ...
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