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  1. #1 Sprocket Help 125cc & Running Rich 
    C-Moto Noob
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    Jun 2016
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    England
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    Hi I have a Sinnis Apache 125 (QM125GY) I currently have 16T Front sprocket and a 51T Rear Sprocket and I can get to 60MPH at a push (65 with wind pushing me along 😂)

    Modifications I also have:
    - Cone Air Filter
    - DEP Exhaust Header Pipe
    - Carbon Stubby Slip On End Can (No DB killer)
    - 95 Main Jet

    I'm trying to find a 17T front sprocket to help the bike a bit more at high RPM/Top speed but can't find one anywhere if anyone knows where I can get one I'd much appreciate it.

    Also it's currently running rich (fuel smell from exhaust, black spark plug) does anyone know how to solve this

    Also any extra tips on how I can improve performance would be gratefully appreciated

    Thanks in advance
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  2. #2 Re: Sprocket Help 125cc & Running Rich 
    Senior C-Moto Guru humanbeing's Avatar
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    Smaller REAR sprocket is easier to get...
    ---
    JT don't had 17T in this model... Some small chinese maker had 17T w/ C45 steel which longevity is a BIG ? https://item.taobao.com/item.htm?id=42309669041
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  3. #3 Re: Sprocket Help 125cc & Running Rich 
    C-Moto Noob
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    Quote Originally Posted by humanbeing View Post
    Smaller REAR sprocket is easier to get...
    ---
    JT don't had 17T in this model... Some small chinese maker had 17T w/ C45 steel which longevity is a BIG ? https://item.taobao.com/item.htm?id=42309669041
    So if I'm correct a 16T front and 48T rear would be the same as a 17T front and 51T rear?
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  4. #4 Re: Sprocket Help 125cc & Running Rich 
    Senior C-Moto Guru humanbeing's Avatar
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    Quote Originally Posted by Motoramble View Post
    So if I'm correct a 16T front and 48T rear would be the same as a 17T front and 51T rear?
    Yes in theory http://www.jtsprockets.com/fileadmin...tgearratio.pdf BUT 48 is hard to find http://www.jtsprockets.com/catalogue/sprocket/JTR269
    Last edited by humanbeing; 06-17-2016 at 12:30 PM.
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