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Thread: Questions about chain / front sprocket

  1. #1
    Senior Member Errtu's Avatar
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    Questions about chain / front sprocket

    So I plan on replacing the chain and changing out my front sprocket to a 15 tooth when I replace all the oil seals.

    For the chain the important numbers are how many links and 428 pitch?

    I'm having a hard time finding the sprocket. Rockey Mountain ATV refuses to sell me the size I want and will only

    sell me the stock size. 15 tooth 428 pitch is what I need right?
    2001 Yamaha TW200
    2015 Nissan Xterra PRO-4X

  2. #2
    Senior Member Donzo's Avatar
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    Procycle and ebay have 15 t front sprockets. Depending on how many tooth rear sprocket you plan (45 to 50) - generally 122 to 126 teeth will work. If you are running a significant larger rear Sprocket you may need longer and 428 is correct

  3. #3
    Senior Member Errtu's Avatar
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    Quote Originally Posted by Donzo View Post
    Procycle and ebay have 15 t front sprockets. Depending on how many tooth rear sprocket you plan (45 to 50) - generally 122 to 126 teeth will work. If you are running a significant larger rear Sprocket you may need longer and 428 is correct
    These are what I'm planning to buy. Let me know if correct please.
    Yes i'm doing 15/50

    Not sure why this says Honda
    https://www.amazon.com/DID-X-Ring-Ch...ateway&sr=8-33

    https://www.amazon.com/JT-SPROCKET-1.../dp/B00A3HLVVM
    2001 Yamaha TW200
    2015 Nissan Xterra PRO-4X

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  5. #4
    Senior Member Fred's Avatar
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    Since your new chain will wrap just ever so more than half way around the new sprocket it will need to additionally span only about 1/2 of the additional teeth, i.e. approximately 5/2= 2.5 links more than stock. So the 130 links should be plenty long. Just an installation idea if you don't already have a better approach: New sprocket and chain cut to length

    However Amazon does say the sprocket not applicable for the TW. Don't know why. You could play it safe and get a TW specific one like this if at all in doubt: Sunstar 21315 15-Teeth 428 Chain Size Front Countershaft Sprocket

    Last edited by Fred; 07-08-2019 at 07:57 PM.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  6. #5
    Senior Member Errtu's Avatar
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    Quote Originally Posted by Fred View Post
    Since your new chain will wrap just ever so more than half way around the new sprocket it will need to additionally span only about 1/2 of the additional teeth, i.e. approximately 5/2= 2.5 links more than stock. So the 130 links should be plenty long. Just an installation idea if you don't already have a better approach: New sprocket and chain cut to length

    However Amazon does say the sprocket not applicable for the TW. Don't know why. You could play it safe and get a TW specific one like this if at all in doubt: Sunstar 21315 15-Teeth 428 Chain Size Front Countershaft Sprocket

    I will switch to that sprocket just in case. How long does my chain need to be? Will 126 work?
    2001 Yamaha TW200
    2015 Nissan Xterra PRO-4X

  7. #6
    Senior Member Sthrnromr's Avatar
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    Questions about chain / front sprocket

    Random info: - I’ve had good luck with Sunstar steel sprockets on a few different off-road bikes over the years.
    Errtu likes this.
    Offroad:
    TW200 - The Goat
    KTM 300 - Orange Dragon
    ATVs

    Onroad:
    Triumphs

    Way too many past bikes and builds to list. I won't bore you. Questions? Just ask.
    =)

  8. #7
    Senior Member sibyrnes's Avatar
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    A 15 tooth front sprocket will work with a stock length chain no problem.
    Fred likes this.
    2017 TW200, 2012 Ducati Multistrada, 2006 Polaris Hawkeye

  9. #8
    Senior Member Fred's Avatar
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    Thought Errtu was going with a 55 tooth rear sprocket, thus my post #4 r.e. determining needed chain length.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  10. #9
    Senior Member Donzo's Avatar
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    Quote Originally Posted by Errtu View Post
    I will switch to that sprocket just in case. How long does my chain need to be? Will 126 work?
    126 will be fine.

  11. #10
    Senior Member Errtu's Avatar
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    Im going to 15 in front and staying 50 in back. So should I buy 126 length or 122 ?
    2001 Yamaha TW200
    2015 Nissan Xterra PRO-4X

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