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Looking for a new sprocket for YZ 125

Joined
Feb 4, 2007
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#1
So my front and rear sprockets are starting to get worn out so I'm thinking it's time to replace them. At the same time, I would like to get a little more torque out of my '97 YZ 125. I believe I'm running 49 in the rear, 13 in the front. What do you guys reccomend for getting some more torque? Also, what brands of sprockets do you reccomend/not reccomend? Are those sprocket and chain kits listed on e bay any good?

As far as installation, I've never put on a new sprocket before. Is it hard to do? Or something that should probably be done by a professional?

Thanks,
Ryan.
 
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Aug 8, 2005
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#2
If you have even a little bit of expirence working with tools you should be able to do the sprocket change yourself. I would go with a one tooth lower sprocket in the front for more torque but thats just me. And as far as brands go I run renthal and havent been disapointed yet.
 
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#3
Thanks. I thought that adding more teeth will give you more torque? Or is that only for the rear sprocket? Can someone explain this to me! :coocoo:
 
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Mar 25, 2007
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#4
adding teeth in the rear will add torque, and taking teeth away in the front will have the same effect. i think 1 tooth in the front is equal to 3 or 4 teeth in the back.
 
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Oct 19, 2006
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#6
If you want a hair more torque, step the rear up to 51 or 53 for a significant change. It isn't necessary to go smaller on the front. For chains and sprockets, I'm partial to DID and Sunstar. I've never been let down.
 
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#7
I'm not sure the size on my front sprocket right now... I think I'm gonna go with 12/49 or 12/50... Or maybe even 13/53? Ahhh please help me decide!

And where can I find these kits online?
 
Last edited:
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May 9, 2007
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#9
Personally I don't like 12T front sprockets, they're murder on the chain. I would stick with 13 on the front, and add 1 or 2 teeth to the rear to achieve what you are trying to do.