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Thread: New chain and sprockets?

  1. #1
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    New chain and sprockets?

    Was preparing to clean the chain when I noticed that the rear sprocket has an odd wear pattern, fishhooking?

    Chain and rear sprocket from June 17 2017. Mileage was at 25,670 miles

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    Chain and rear sprocket from September 4, 2017. Mileage at 26,946 miles.

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    Looks like it's time for a new set of sprockets and a chain?

    I find it odd that the rear sprocket would wear so fast in such a short time, or is that normal?

    The chain and sprocket has roughly 13,000 miles. Was installed by the previous owner and purchased from AF1.

  2. #2
    apriliaforum Member bkmo's Avatar
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    The sprockets wear like that when the chain wears and stretches. Most sprockets are of similar quality like sunstar, JT, renthal. What you need is a high quality chain. That wear may be a bit excessive at 13k but I have seen worse.
    2002 Capo Wilbers rear shock, Wilbers front progressive springs, Metal fuel connectors, polaris sh775 series regulator direct wired, silicone vacuum lines, catfish map, CNC clutch slave, autoelectrics coils (2)sides, Triumph Denso 3990's centers, k&n air filter, all LED lighting, SS brake and clutch lines, Givi tall screen, Triumph tiger 955i mirrors, dual horns. Pure copper 4 gauge battery cables. Rox risers.

  3. #3
    apriliaforum expert Stu_O's Avatar
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    And I've seen a lot better. Yeah, time for replacement. That rear sprocket shouldn't have noticeable hooking at 13000 miles. Like bkmo says, it was likely too loose for too long, and probably not lubed well. Set the slack at 15 mm, and adjust when it grows beyond 20 mm.

    Not that it matters, but I wonder what brand of rear sprocket is that with the rubber bonded on? Ognibene, maybe. The front sprocket is an aftermarket one of the type sold by AF1, but that rear? Not from AF1, I don't think.

    Stu
    Last edited by Stu_O; 09-04-2017 at 02:19 PM.

  4. #4
    apriliaforum prov-nov skvrnsk's Avatar
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    And this is my front sprocket... or what's left of it
    Still in use No idea how many kilometers has on it, I assume half the bike's life which is 91k now.

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    New chain and sprockets.
    https://www.czretezy.cz/?id=sm_hp&lng=en
    https://www.esjot.com/en/motorcycle-...orcycle/40111/

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    Last edited by skvrnsk; 09-04-2017 at 02:41 PM.

  5. #5
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    Quote Originally Posted by Stu_O View Post
    And I've seen a lot better. Yeah, time for replacement. That rear sprocket shouldn't have noticeable hooking at 13000 miles. Like bkmo says, it was likely too loose for too long, and probably not lubed well. Set the slack at 15 mm, and adjust when it grows beyond 20 mm.

    Not that it matters, but I wonder what brand of rear sprocket is that with the rubber bonded on? Ognibene, maybe. The front sprocket is an aftermarket one of the type sold by AF1, but that rear? Not from AF1, I don't think.

    Stu
    I have a receipt from the PO with part numbers, the chain and sprockets were both sourced from AF1 Racing. The Item Number on the invoice : ES50-29028-45.

    I did adjust the chain at the last cleaning, but obviously I ended up way too loose. :-(

  6. #6
    apriliaforum expert Stu_O's Avatar
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    Quote Originally Posted by yosso View Post
    I have a receipt from the PO with part numbers, the chain and sprockets were both sourced from AF1 Racing. The Item Number on the invoice : ES50-29028-45.

    I did adjust the chain at the last cleaning, but obviously I ended up way too loose. :-(
    That's the Esjot sprocket, same as skvrnsk has above. You'll find out if that's what's actually on there when you remove it. I have one here, and there's no rubber on it. BTW, consider replacing the cush drive rubbers as long as you're pulling the drive hub. They're pretty inexpensive.

    Svrnsk, didn't that front sprocket slip in the chain during acceleration? I don't think I've ever seen one worn so badly.
    Last edited by Stu_O; 09-04-2017 at 07:47 PM.

  7. #7
    apriliaforum prov-nov skvrnsk's Avatar
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    No such thing happened yet, but knowing how my sprockets looks like I try not to ride like a maniac.

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