Question about 2006 Yamaha Ybr 125

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Front sprocket Can you suggest a one tooth less front sprocket than the original front sprocket of the Yamaha YBR 125 (2008) to fit the same YBR 125 ?

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  • alecstev Dec 28, 2008

    Thanks for your answer but I ment the other way round sorry.

    I want a bit more accelleration, so I take it that I should fit a front sproket with one more extra tooth. I need you to suggest a front sprocket with one more extra tooth that will fit to my Yamaha YBR 125 (2008 model) Do you know the number of teeth the original sproket of my YBR should have ?

  • alecstev Dec 29, 2008

    Hi...., thanks for your reply. I would go for the other sollution and change the rear sprocket. All I want is a bit more of accelleration when I am loaded with a pillion, so if you can suggest the thing and the supplier, I would try to get it over the internet since I live in Malta.

    All the best and regards


  • alecstev Dec 29, 2008

    Thanks, I shall let you know the result later on.

    regards steve

  • Anonymous Mar 16, 2014

    ybr 125 clutch adjustmentwill nnot change down to 1 st 0 r 2 nd when ridden for half mile but will when on stand

  • Anonymous Mar 21, 2014

    sound occur when cluch releaves



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Hi ........... One tooth less will give you more top speed (if you can pull top revs) but will reduce accelleration. If you go for one tooth less you'll need to tighten the chain and/or remove a link. It's a trade off ............ decide what you want the bike to do.

Posted on Dec 24, 2008

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  • Van_Kerr Dec 29, 2008

    Hi .... Changing the gearbox sprocket is the cheapest way to achieve what you want. What you have to watch out for is the clearance between the sprocket and the crankcases (esp'ly if chain snaps/breaks). Which country do you live in ? Any suppliers I know of are all UK based. ALL will be able to supply alternative sprockets in (almost) any tooth number you want. More expensive solution but maybe more appropriate solution, esp'ly if top speed isn't an issue, would be to increase number of teeth on the REAR sprocket, you'd have a HUGE choice of variables BUT top speed could be dramatically reduced.You would also need a longer chain depending how large you go. One on the front is equal to two/three on the rear ............ How fast due you want to accellerate ?

  • Van_Kerr Dec 29, 2008

    Hi ... Go for two or three extra teeth on the rear sprocket, you'll also need to add links (if the chains good) or change the chain for a longer (and heavier ?) one.

    Try ...............'s

  • 19yugi87 Jan 08, 2011

    How about sprockets on ybr125 that can run 120.



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