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Thread: How do you change a front sprocket?

  1. #1
    DSBC Participating Member North's Avatar
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    I got a new front sprocket, its one tooth smaller. But I don't know how to change it.

    I am assuming that you just take the bolt off? Is it a left hand thread and do you depress the back brake when you take the nut off?

    Thanks





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    Administrator tomcycle's Avatar
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    What kind of bike?
    Tom Timmerman
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    DSBC Participating Member North's Avatar
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    An 08 KTM 530 EXC-R

    Thanks



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    DSBC Participating Member Island Hopper's Avatar
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    Thats pretty much the way to do it North and don't forget to loctite the bolt upon reassembly... If it's similar to the 640 {which it probably is} there is a spring washer inside the bolt which holds the sprocket to the bushing to the inner o-ring seal.... You should change this washer each time with the sprocket but can probably get away with reusing it a time or 2.... I run long miles on my bike so I now change it every time to avoid the chance of a countershaft leak.....

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    DSBC Participating Member North's Avatar
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    Thanks, so it is a left hand thread?

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    DSBC Participating Member The Pope's Avatar
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    it will be much easier with an impact gun.

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    No, it's a normal bolt thread. I just use the back brake to hold her steady. Lefty loosey, righty tighty hehe...

    KTM recommends using a new bolt/washer every time you change that sprocket FYI. Your bike is new, so there should be no need.

    Just make sure you do a good job cleaning the threads of the threadlocker, and reinstall using loctite and a torque wrench. The torque spec is in the back of the manual that came with your bike.

    I ordered a few of these bolt/washer kits and carry one with me when I ride just in case. A misaligned back wheel can cause you to hammer the "springyness?" out of the washer and the resulting oil leak makes quite a mess. Been there with the 640 and the 525.

    I also changed the o-ring that seals the countershaft sprocket spacer to a #119 size sometime called a #25119 I think? Get em atLordco or wherever. It is slightyly fatter than the stocker, and helps improve the seal.<-- this is a tipI got from KTMTalk.com

    Cheers!

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    DSBC Participating Member North's Avatar
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    Thanks

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    DSBC Participating Member joker650's Avatar
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    The Pope wrote:
    it will be much easier with an impact gun.
    I wouldn't reccomend using an impact gun on that nut

    The sharp hammering could cause damage to the teeth on the internal gears.
    My life has a superb cast, but I can't figure out the plot...

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